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Every calculator on the site, grouped by category. Looking to convert a unit instead? Those live in the converter section.

Most popular calculators

Ranked by search demand across the whole site.

  1. Mortgage Calculator Estimate a full monthly mortgage payment including principal, inter…
  2. BMI Calculator Calculate Body Mass Index from height and weight, and see which WHO…
  3. Percentage Calculator Every common percentage question in one place: percent of a number,…
  4. Loan Calculator Work out the monthly payment, total interest and payoff date for an…
  5. Scientific Calculator A full scientific calculator with trigonometry, logarithms, powers,…
  6. Age Calculator Calculate exact age in years, months and days, plus total weeks, da…
  7. Auto Loan Calculator Price a car loan with sales tax, dealer fees, a trade-in and a down…
  8. Calorie Calculator Work out daily calorie needs with the Mifflin-St Jeor equation, adj…
  9. Income Tax Calculator Estimate federal income tax with progressive brackets, the standard…
  10. Take-Home-Paycheck Calculator Estimate net pay after federal tax, Social Security, Medicare, stat…

Financial Calculators

364 tools
Mortgage Calculator Estimate a full monthly mortgage payment including principal, interest, prope… Loan Calculator Work out the monthly payment, total interest and payoff date for any fixed-ra… Auto Loan Calculator Price a car loan with sales tax, dealer fees, a trade-in and a down payment f… Interest Calculator See how much interest a balance earns over time with any compounding frequenc… Payment Calculator Solve for the fixed monthly payment on any amount financed, or work backwards… Retirement Calculator Project the balance you will have at retirement, restate it in today's dollar… Amortization Calculator Build a full amortization schedule showing interest, principal and remaining … Investment Calculator Project what an investment grows to with regular contributions, and split the… Currency Calculator Convert between 30 currencies at today's mid-market rate, updated daily from … Inflation Calculator See what a sum of money will be worth after years of inflation, in both direc… Finance Calculator A general time-value-of-money solver: enter present value, payment, rate and … Mortgage Payoff Calculator Find out how many years and how much interest an extra monthly payment remove… Income Tax Calculator Estimate federal income tax with progressive brackets, the standard or itemiz… Compound Interest Calculator Watch compounding work: the balance, the interest earned, and how much differ… Salary Calculator Convert any pay rate to hourly, weekly, biweekly, monthly and annual equivale… 401K Calculator Project a 401(k) balance including employer match, salary growth and compound… Interest Rate Calculator Work backwards from a payment you were quoted to the interest rate you are ac… Sales Tax Calculator Add sales tax to a price or strip it back out, for any state or local rate. House Affordability Calculator Turn your income, debts and down payment into a realistic maximum home price … Savings Calculator Plan a savings goal: how a starting balance plus steady deposits grows at a g… Rent Calculator Find the rent range your income supports, using the 30% rule and the stricter… Marriage Tax Calculator Compare tax filed separately as two singles against married filing jointly to… Estate Tax Calculator Estimate federal estate tax after debts, charitable bequests and the lifetime… Pension Calculator Calculate a defined-benefit pension from your service years, benefit multipli… Social Security Calculator See how claiming Social Security early or late changes your monthly check and… Annuity Calculator Value a stream of fixed payments as an ordinary annuity or an annuity due, in… Annuity Payout Calculator Work out the sustainable payment a lump sum supports over a fixed payout peri… Credit Card Calculator Find out how long a credit card balance takes to clear at your current paymen… Credit Cards Payoff Calculator Compare the avalanche and snowball strategies across several cards and see wh… Debt Payoff Calculator See your debt-free date and the interest an extra payment each month removes. Debt Consolidation Calculator Compare your current debts against a consolidation loan, fees included, befor… Repayment Calculator Set a repayment schedule for any balance and see total interest by term. Student Loan Calculator Plan student loan repayment on the standard 10-year plan, including interest … College Cost Calculator Project the full cost of a degree years from now and the monthly saving neede… Simple Interest Calculator Calculate flat, non-compounding interest with the classic I = P·r·t formula. CD Calculator Value a certificate of deposit or fixed deposit at maturity and compare terms… Bond Calculator Price a bond from its coupon, maturity and the market yield, and see current … Mutual Fund Calculator Project a mutual fund or SIP investment and see exactly how much the expense … Roth IRA Calculator Project a Roth IRA and compare it with a taxable account so you can see the v… IRA Calculator Project a traditional IRA balance and the after-tax value once withdrawals ar… RMD Calculator Calculate the required minimum distribution from a retirement account using t… VAT Calculator Add VAT to a net price or extract VAT from a gross price at any rate. Cash Back or Low Interest Calculator Decide between a manufacturer rebate and a promotional low APR by comparing t… Auto Lease Calculator Break a car lease into depreciation and rent charge so you can see exactly wh… Depreciation Calculator Produce a depreciation schedule using straight-line, double-declining-balance… Average Return Calculator Convert a total gain into a compound annual growth rate, the only fair way to… Margin Calculator Calculate gross margin, markup and profit per unit, and stop confusing margin… Discount Calculator Apply one or more discounts to a price and see the real saving, tax included. Business Loan Calculator Price a business loan including origination fees, and see the true APR after … Debt-to-Income Ratio Calculator Calculate front-end and back-end DTI, the two numbers every mortgage underwri… Real Estate Calculator Evaluate a property purchase: cash flow, cap rate, cash-on-cash return and eq… Take-Home-Paycheck Calculator Estimate net pay after federal tax, Social Security, Medicare, state tax and … Personal Loan Calculator Price a personal loan with origination fees folded into the effective rate. Boat Loan Calculator Price a boat, RV or other recreational vehicle loan, which typically runs lon… Lease Calculator Calculate a general lease payment from asset value, residual value, term and … Refinance Calculator Compare your current mortgage with a refinance, including closing costs and t… Budget Calculator Balance a monthly budget and compare your spending against the 50/30/20 guide… Rental Property Calculator Underwrite a rental: cash flow, cap rate, cash-on-cash return, and the 1% rul… IRR Calculator Compute IRR and NPV for a series of yearly cash flows to judge whether a proj… ROI Calculator Turn an investment gain into ROI and an annualized rate you can compare acros… APR Calculator Fold origination fees and points into the rate to get the APR lenders must di… FHA Loan Calculator Price an FHA loan including the upfront and annual mortgage insurance premium. VA Mortgage Calculator Price a VA loan with the funding fee, which changes with your down payment an… Home Equity Loan Calculator Find how much equity you can borrow and what the second-mortgage payment woul… HELOC Calculator Model a HELOC through both phases: interest-only during the draw period, then… Down Payment Calculator Work out the down payment a purchase needs and how long your saving rate take… Rent vs. Buy Calculator Compare the total cost of renting and buying over your real time horizon, inc… Payback Period Calculator Find how long an investment takes to repay itself, on both a simple and a dis… Present Value Calculator Discount a future sum or a stream of payments back to what it is worth today. Future Value Calculator Grow a sum forward at a given rate, with or without annual additions. Commission Calculator Calculate gross commission and your take after a brokerage split. Mortgage Calculator UK Price a UK mortgage in pounds on either a repayment or interest-only basis, w… Canadian Mortgage Calculator Price a Canadian mortgage with semi-annual compounding and accelerated paymen… Mortgage Amortization Calculator Print a complete mortgage amortization schedule with yearly summaries and the… Percent Off Calculator Take any percentage off a price instantly and see what you save. APY Calculator Convert a nominal rate into the annual percentage yield you actually earn onc… CAGR Calculator Turn a start value, an end value and a time span into the compound annual gro… SIP Calculator Project a systematic investment plan: what regular monthly contributions grow… Forex Compounding Calculator Model a trading account compounding at a fixed percentage per period, with op… How Long to Save Calculator Find out how many months of saving stand between you and a target, with inter… How Long Will Money Last Calculator See how long a pot of money survives a given withdrawal rate, with returns co… Money Counter Count a cash drawer, a till or a jar of change by denomination, with running … Stock Average Calculator Work out your weighted average cost per share across several purchases, and s… Savings Goal Calculator Work backwards from a target and a deadline to the monthly amount you need to… Price Per Square Foot Calculator Compare properties or quotes on a like-for-like basis by reducing them to pri… Cash Back Calculator Work out whether a rewards card actually pays: cash back earned, the annual f… Unit Price Calculator Compare two package sizes on price per unit to see which is genuinely cheaper. Break Even Calculator Find the sales volume where revenue covers all costs, plus the volume needed … Markup Calculator Turn a cost and a markup into a selling price, and see the margin that markup… Simple Savings Interest Calculator Calculate simple interest on a deposit, with the compound figure alongside fo… Profit Margin Calculator Calculate profit and net margin from revenue and total costs, with the markup… Revenue Growth Calculator Calculate period-on-period revenue growth and the compound rate behind it. Inventory Turnover Calculator Calculate inventory turnover and days of stock cover from COGS and average in… Interest Rate Conversion Calculator Convert a nominal interest rate into the effective annual rate for any compou… Customer Acquisition Cost Calculator Calculate CAC, lifetime value and the LTV:CAC ratio that tells you whether gr… Conversion Rate Calculator Calculate conversion rate, revenue per visitor and the traffic a target would… ROAS Calculator Calculate ROAS and, more usefully, the break-even ROAS your margin actually r… Sales Tax Backwards Calculator Work backwards from a tax-inclusive price to the net price and the tax it con… Gift Budget Calculator Divide a gift budget across a list, with a larger share for the people closes… Wedding Budget Calculator Break a wedding budget into the standard category percentages, with cost per … Moving Cost Calculator Estimate the cost of a house move from volume, distance and optional packing. Currency Exchange Fee Calculator Work out what a currency exchange really costs once the spread is added to th… Invoice Total Calculator Build an invoice total from hours, rate, expenses, discount and tax. Late Payment Interest Calculator Calculate the interest and compensation an overdue invoice has accrued. Discount Chain Calculator Apply several discounts in sequence and see the single equivalent discount th… Price to Earnings Ratio Calculator Calculate the price-to-earnings ratio and the earnings yield it implies. Current Ratio Calculator Calculate current and quick ratios, the two standard tests of short-term liqu… Return on Equity Calculator Calculate return on equity and what it implies for compounding shareholder va… EBITDA Calculator Calculate EBITDA and EBITDA margin, with the multiple-based valuation it feed… Cash Conversion Cycle Calculator Calculate the cash conversion cycle — how long cash is tied up between paying… WACC Calculator Calculate the weighted average cost of capital, the discount rate a business … CAPM Calculator Calculate the return CAPM says an asset should earn for the systematic risk i… 3x Rent Calculator Check whether your income meets a landlord's rent multiple, in both direction… Gross Rent Multiplier Calculator Calculate the gross rent multiplier, the fastest screening ratio in property … Net Effective Rent Calculator Work out what a lease with free months really costs per month, and what the r… Credit Card Minimum Payment Calculator See how long a credit card takes to clear when you only ever pay the minimum,… Savings Interest Rate Calculator Work backwards from two balances to the interest rate you actually earned. Subscription Cost Calculator Add up what subscriptions cost per year, and what the unused share is worth i… Cell Phone Plan Calculator Compare the true monthly cost of a phone plan across lines, device payments a… Car vs Bike Calculator Compare the running cost of driving a commute against cycling it, with the pa… Back to School Cost Calculator Budget the start of a school year across uniform, supplies, shoes, technology… Life Insurance Needs Calculator (DIME Method) Estimate life insurance coverage using the DIME method: Debt, Income, Mortgag… COBRA Cost Calculator Calculate COBRA continuation coverage cost under the standard 102% rule. Term vs Whole Life Insurance Calculator Compare the cost of term and whole life insurance, and what investing the pre… Lottery Payout Calculator (Lump Sum vs Annuity) Compare the lump-sum cash option against the annuity for a lottery jackpot, a… Alimony (Spousal Support) Calculator Estimate spousal support using a common guideline formula, for orientation on… Estate Tax Exemption Calculator Calculate federal estate tax against the current exemption, and how much of a… Fisher Equation Calculator Calculate the real interest rate from a nominal rate and expected inflation u… Put-Call Parity Calculator Calculate the fair put price implied by a call price under put-call parity, f… Cost of Goods Sold Calculator Calculate Cost of Goods Sold from beginning inventory, purchases and ending i… Economic Profit Calculator Calculate economic profit by subtracting both explicit and implicit costs fro… Price Elasticity of Demand Calculator Calculate price elasticity of demand using the midpoint method, and see wheth… Opportunity Cost Calculator Calculate the opportunity cost of a decision as the return of the best altern… Marginal Revenue Calculator Calculate marginal revenue — the extra revenue from selling one more unit — f… Gift of Equity Calculator Calculate the gift of equity when a home is sold to a family member below its… Unlevered Beta Calculator Strip the effect of debt out of a company's equity beta using the Hamada equa… SWP Calculator (Systematic Withdrawal Plan) Calculate how long a lump-sum investment lasts under a fixed monthly withdraw… Operating Cash Flow Calculator Calculate operating cash flow from net income using the indirect method. Trump Accounts Calculator (IRC Section 530A) Project the value of a Trump Account (IRC Section 530A) at age 18, including … HRA Exemption Calculator (India, Section 10(13A)) Calculate the tax-exempt portion of House Rent Allowance under Section 10(13A… Phillips Curve Calculator Calculate predicted inflation from the unemployment gap using the expectation… Smoker's Cost to Company Calculator Calculate the annual cost to an employer of an employee's paid smoke breaks, … Cost Per Minute Calculator Calculate the cost per minute of anything billed for a fixed duration — calls… Disposable Income Calculator Calculate disposable income (after tax) and discretionary income (after tax a… EPF Calculator (India) Project an EPF (Employees' Provident Fund) balance at retirement, including b… Discounted Cash Flow (DCF) Calculator Calculate the present value of a business or investment from projected cash f… PPF Calculator (Public Provident Fund, India) Project the maturity value of a Public Provident Fund (PPF) account from annu… Operating Asset Turnover Ratio Calculator Calculate how efficiently a business generates revenue from its operating ass… Additional Funds Needed (AFN) Calculator Calculate how much external financing a growing business will need using the … Week over Week (WoW) Growth Calculator Calculate week-over-week (WoW) growth — a standard short-term metric for trac… Money Multiplier Calculator Calculate the theoretical money multiplier from a reserve requirement ratio, … Net Operating Assets Calculator Calculate Net Operating Assets — the capital actually tied up running a busin… Net Operating Working Capital Calculator Calculate Net Operating Working Capital — working capital tied specifically t… FCFE Calculator (Free Cash Flow to Equity) Calculate Free Cash Flow to Equity — the cash actually available to sharehold… Price Elasticity of Supply Calculator Calculate price elasticity of supply using the midpoint method, and see wheth… Cost of Hiring an Expert vs. a Fresher Calculator Compare the true cost-per-output of hiring an experienced expert versus a les… Stock Split Calculator Calculate the number of shares and adjusted price after a stock split. Loss Given Default (LGD) Calculator Calculate Loss Given Default — the percentage of exposure a lender actually l… Goodwill Calculator (M&A Accounting) Calculate accounting goodwill from an acquisition — the premium paid above th… Long Term Care Cost Calculator Project the future cost of long-term care, accounting for years until it may … Comparative Advantage Calculator Determine which country holds comparative advantage in each good, based on op… Millionaire Calculator Calculate how many years it will take to reach $1,000,000 given current savin… Year over Year (YoY) Growth Calculator Calculate year-over-year (YoY) growth — the standard metric for comparing per… Zakat Calculator (Gold & Silver Nisab) Calculate Zakat owed on cash, gold and silver holdings against the current ni… Ending Inventory Calculator Calculate ending inventory from beginning inventory, purchases made, and cost… Optimal Price Calculator (Linear Demand) Calculate the profit-maximizing price and quantity for a linear demand curve … Portfolio Beta Calculator Calculate a portfolio's overall beta as the weighted average of its individua… Spending Multiplier Calculator Calculate the Keynesian spending multiplier from the marginal propensity to c… High-Low Method Cost Estimation Calculator Separate a mixed cost into its fixed and variable components using the high-l… Recurring Deposit (RD) Calculator Calculate the maturity value of a Recurring Deposit (RD) from monthly deposit… LIFO Inventory Valuation Calculator Calculate Cost of Goods Sold and ending inventory value using the LIFO (Last-… FD Calculator (Fixed Deposit) Calculate the maturity amount and interest earned on a fixed deposit, account… 403(b) Retirement Calculator Project a 403(b) retirement account balance from salary, contribution rate, a… PMI Calculator (Private Mortgage Insurance) Estimate Private Mortgage Insurance (PMI) cost based on loan amount, credit s… Earnest Money Deposit Calculator Calculate a typical earnest money deposit amount for a home purchase offer. EVM Calculator (Earned Value Management) Calculate Earned Value Management metrics — schedule and cost variance, SPI a… PVGO Calculator (Present Value of Growth Opportunities) Calculate the Present Value of Growth Opportunities (PVGO) — how much of a st… Relative Strength Index (RSI) Calculator Calculate the Relative Strength Index (RSI) — a momentum indicator comparing … Maximum Drawdown Calculator Calculate maximum drawdown — the largest peak-to-trough decline an investment… GMROI Calculator (Gross Margin Return on Investment) Calculate Gross Margin Return on Investment (GMROI) — a retail metric measuri… EPS Growth Rate Calculator Calculate the year-over-year (or period-over-period) growth rate in Earnings … Carry Trade Calculator (Forex) Calculate the potential annual return from a currency carry trade based on th… Degree of Operating Leverage (DOL) Calculator Calculate the Degree of Operating Leverage — how sensitive operating income i… Graham Number Calculator Calculate the Graham Number — Benjamin Graham's formula for a conservative es… Market Capitalization Calculator Calculate a company's market capitalization from shares outstanding and curre… Money Market Account Calculator Calculate the growth of a money market account balance from an initial deposi… Month-over-Month (MoM) Growth Calculator Calculate month-over-month (MoM) growth — a short-term metric for tracking bu… FFO Calculator (Funds From Operations) Calculate Funds From Operations (FFO) — the standard cash-flow-focused earnin… Sinking Fund Calculator Calculate the regular deposit needed to reach a specific future savings goal,… Free Float Calculator (Shares) Calculate a company's free float — the number and percentage of shares actual… Return on Sales (ROS) Calculator Calculate Return on Sales (ROS) — also known as operating margin — measuring … DuPont Analysis Calculator (ROE Decomposition) Decompose Return on Equity (ROE) into its three DuPont components: profit mar… Pennies to Dollars Converter Convert a quantity of pennies (cents) to dollars. Remote vs. On-Location Worker Cost Calculator Compare the total cost of on-location office workers versus remote workers, i… Deadweight Loss Calculator Calculate deadweight loss — the economic value lost when a tax or price contr… NAV Calculator (Net Asset Value) Calculate the Net Asset Value (NAV) per share of a mutual fund or investment … AGI Calculator (Adjusted Gross Income) Calculate Adjusted Gross Income (AGI) from gross income and common above-the-… Jensen's Alpha Calculator Calculate Jensen's Alpha — the risk-adjusted measure of how much a portfolio … Alaska Income Tax Calculator Alaska does not tax wage income. This page explains what that does and does n… Arizona Income Tax Calculator Estimate Arizona state income tax at the flat rate of 2.50%, with the effecti… Colorado Income Tax Calculator Estimate Colorado state income tax at the flat rate of 4.40%, with the effect… Florida Income Tax Calculator Florida does not tax wage income. This page explains what that does and does … Georgia Income Tax Calculator Estimate Georgia state income tax at the flat rate of 5.39%, with the effecti… Idaho Income Tax Calculator Estimate Idaho state income tax at the flat rate of 5.70%, with the effective… Illinois Income Tax Calculator Estimate Illinois state income tax at the flat rate of 4.95%, with the effect… Indiana Income Tax Calculator Estimate Indiana state income tax at the flat rate of 3.05%, with the effecti… Iowa Income Tax Calculator Estimate Iowa state income tax at the flat rate of 3.80%, with the effective … Kentucky Income Tax Calculator Estimate Kentucky state income tax at the flat rate of 4.00%, with the effect… Louisiana Income Tax Calculator Estimate Louisiana state income tax at the flat rate of 3.00%, with the effec… Massachusetts Income Tax Calculator Estimate Massachusetts state income tax at the flat rate of 5.00%, with the e… Michigan Income Tax Calculator Estimate Michigan state income tax at the flat rate of 4.25%, with the effect… Mississippi Income Tax Calculator Estimate Mississippi state income tax at the flat rate of 4.40%, with the eff… Nevada Income Tax Calculator Nevada does not tax wage income. This page explains what that does and does n… New Hampshire Income Tax Calculator New Hampshire does not tax wage income. This page explains what that does and… North Carolina Income Tax Calculator Estimate North Carolina state income tax at the flat rate of 4.25%, with the … Pennsylvania Income Tax Calculator Estimate Pennsylvania state income tax at the flat rate of 3.07%, with the ef… South Dakota Income Tax Calculator South Dakota does not tax wage income. This page explains what that does and … Tennessee Income Tax Calculator Tennessee does not tax wage income. This page explains what that does and doe… Texas Income Tax Calculator Texas does not tax wage income. This page explains what that does and does no… Utah Income Tax Calculator Estimate Utah state income tax at the flat rate of 4.55%, with the effective … Washington Income Tax Calculator Washington does not tax wage income. This page explains what that does and do… Wyoming Income Tax Calculator Wyoming does not tax wage income. This page explains what that does and does … Bond Yield Calculator Calculate a bond's current yield and approximate yield to maturity from price… Dividend Yield Calculator Calculate dividend yield and the income a holding produces. Dividend Reinvestment Calculator Project a portfolio when dividends are reinvested, with share count compoundi… Capital Gains Tax Calculator Estimate capital gains tax after allowable costs and the annual exempt amount. Net Worth Calculator Add up assets and subtract liabilities to find net worth, with the liquidity … Emergency Fund Calculator Work out an emergency fund target from essential expenses, and how long your … Rule of 72 Calculator Estimate how long an investment takes to double, and see how close the rule o… Cost of Capital Calculator Calculate WACC from the mix of debt and equity, with the tax shield on debt a… Marginal Cost Calculator Calculate the cost of producing one more unit, and whether average cost is fa… Margin of Safety Calculator Measure how far sales can fall before the business stops making a profit. Cost Per Mile Calculator Work out the real cost of a mile driven, including the costs people forget. Cost of Owning a Dog Calculator Add up the real cost of dog ownership per month, per year and across a lifeti… Cost of Having a Baby Calculator Budget the first year with a baby, separating one-off setup from recurring mo… Sales Commission Tiers Calculator Calculate commission across graduated tiers, with the effective and marginal … Loan Comparison Calculator Compare two loan offers on total cost, not on the headline rate or the monthl… Debt Avalanche vs Snowball Calculator Compare paying the highest rate first against the smallest balance first, on … Mortgage Overpayment Calculator See what a regular overpayment removes from a mortgage in time and in interes… Rent Increase Calculator Work out a new rent after an increase, and what it means in real terms after … Security Deposit Interest Calculator Calculate the interest accrued on a held security deposit. Grocery Budget Calculator Set a grocery budget by household size and spending level, per week, month an… Coffee Cost Calculator Compare the cost of buying coffee against making it at home, over a year and … Smoking Cost Calculator Add up what smoking costs per week, per year and across a decade, with the in… Commute Cost Calculator Add up what commuting costs in fuel, parking and tolls — and in hours. Electric vs Petrol Car Calculator Compare annual running costs between a petrol car and an electric one at your… Home Office Deduction Calculator Apportion home costs to a home office by floor area, the method most tax auth… Freelance Tax Set-Aside Calculator Work out how much of each payment to set aside for tax as a freelancer. Dividend Discount Model Calculator Value a dividend-paying share with the Gordon growth model, and see how viole… Bond Current Yield Calculator Calculate a bond's current yield and an approximate yield to maturity from it… Beta Stock Calculator Calculate a stock's beta and the return CAPM says that level of risk should e… Safety Stock Calculator Calculate safety stock and the reorder point with the max-minus-average metho… Accumulated Depreciation Calculator Calculate accumulated depreciation and current book value on a straight-line … Car Depreciation Calculator Project a car's value over time, with the steeper first-year drop applied sep… After-Tax Cost of Debt Calculator Calculate the after-tax cost of debt and the tax shield that interest deducti… Annual Salary Calculator Convert any pay rate into an annual salary, with the weekly, biweekly and mon… Monthly Salary Calculator Work out monthly gross pay from any hourly, weekly or annual figure — the num… Weekly Pay Calculator Convert an hourly rate or annual salary into weekly gross pay, including part… Biweekly Pay Calculator Work out biweekly gross pay and see why 26 pay periods a year is not the same… 15 Year Mortgage Calculator Price a 15-year fixed mortgage and compare the higher payment against the int… Loan Payoff Calculator See how fast a loan clears at your current payment, and how much sooner — and… 72 Month Car Loan Calculator Model a six-year car loan and see the interest the longer term adds against t… Daily Compound Interest Calculator Compound interest calculated daily — the schedule savings accounts and most c… 20 Year Mortgage Calculator Estimate a full monthly mortgage payment including principal, interest, prope… 3 Year Loan Calculator Work out the monthly payment, total interest and payoff date for any fixed-ra… 10 Year Loan Calculator Work out the monthly payment, total interest and payoff date for any fixed-ra… 48 Month Auto Loan Calculator Price a car loan with sales tax, dealer fees, a trade-in and a down payment f… 72 Month Auto Loan Calculator Price a car loan with sales tax, dealer fees, a trade-in and a down payment f… 84 Month Auto Loan Calculator Price a car loan with sales tax, dealer fees, a trade-in and a down payment f… 24 Month Payment Calculator Solve for the fixed monthly payment on any amount financed, or work backwards… 36 Month Payment Calculator Solve for the fixed monthly payment on any amount financed, or work backwards… 60 Month Payment Calculator Solve for the fixed monthly payment on any amount financed, or work backwards… 3 Year Amortization Calculator Build a full amortization schedule showing interest, principal and remaining … 5 Year Amortization Calculator Build a full amortization schedule showing interest, principal and remaining … 10 Year Amortization Calculator Build a full amortization schedule showing interest, principal and remaining … 3 Year Inflation Calculator See what a sum of money will be worth after years of inflation, in both direc… 5 Year Inflation Calculator See what a sum of money will be worth after years of inflation, in both direc… 10 Year Inflation Calculator See what a sum of money will be worth after years of inflation, in both direc… Quarterly Compound Interest Calculator Interest compounded four times a year, the convention for many bonds and cert… 3 Year 401K Calculator Project a 401(k) balance including employer match, salary growth and compound… 5 Year 401K Calculator Project a 401(k) balance including employer match, salary growth and compound… 10 Year 401K Calculator Project a 401(k) balance including employer match, salary growth and compound… 24 Month Interest Rate Calculator Work backwards from a payment you were quoted to the interest rate you are ac… 36 Month Interest Rate Calculator Work backwards from a payment you were quoted to the interest rate you are ac… 3 Year Annuity Payout Calculator Work out the sustainable payment a lump sum supports over a fixed payout peri… 5 Year Annuity Payout Calculator Work out the sustainable payment a lump sum supports over a fixed payout peri… 10 Year Annuity Payout Calculator Work out the sustainable payment a lump sum supports over a fixed payout peri… 24 Month Repayment Calculator Set a repayment schedule for any balance and see total interest by term on a … 60 Month Repayment Calculator Set a repayment schedule for any balance and see total interest by term on a … 20 Year Student Loan Calculator Plan student loan repayment on the standard 10-year plan, including interest … 3 Year Roth IRA Calculator Project a Roth IRA and compare it with a taxable account so you can see the v… 5 Year Roth IRA Calculator Project a Roth IRA and compare it with a taxable account so you can see the v… 10 Year Roth IRA Calculator Project a Roth IRA and compare it with a taxable account so you can see the v… 3 Year IRA Calculator Project a traditional IRA balance and the after-tax value once withdrawals ar… 5 Year IRA Calculator Project a traditional IRA balance and the after-tax value once withdrawals ar… 10 Year IRA Calculator Project a traditional IRA balance and the after-tax value once withdrawals ar… Remove VAT Calculator Strip VAT out of a gross price to find the net figure — the calculation for r… 24 Month Cash Back or Low Interest Calculator Decide between a manufacturer rebate and a promotional low APR by comparing t… 36 Month Cash Back or Low Interest Calculator Decide between a manufacturer rebate and a promotional low APR by comparing t… 48 Month Auto Lease Calculator Break a car lease into depreciation and rent charge so you can see exactly wh… 60 Month Auto Lease Calculator Break a car lease into depreciation and rent charge so you can see exactly wh… 72 Month Auto Lease Calculator Break a car lease into depreciation and rent charge so you can see exactly wh… 84 Month Auto Lease Calculator Break a car lease into depreciation and rent charge so you can see exactly wh… 3 Year Business Loan Calculator Price a business loan including origination fees, and see the true APR after … 5 Year Business Loan Calculator Price a business loan including origination fees, and see the true APR after … 10 Year Business Loan Calculator Price a business loan including origination fees, and see the true APR after … 3 Year Real Estate Calculator Evaluate a property purchase: cash flow, cap rate, cash-on-cash return and eq… 5 Year Real Estate Calculator Evaluate a property purchase: cash flow, cap rate, cash-on-cash return and eq… 10 Year Real Estate Calculator Evaluate a property purchase: cash flow, cap rate, cash-on-cash return and eq… Weekly Take-Home Pay Calculator Estimate net pay after federal tax, Social Security, Medicare, state tax and … Monthly Take-Home Pay Calculator Estimate net pay after federal tax, Social Security, Medicare, state tax and … Semi-Monthly Take-Home Pay Calculator Estimate net pay after federal tax, Social Security, Medicare, state tax and … 24 Month Personal Loan Calculator Price a personal loan with origination fees folded into the effective rate on… 60 Month Personal Loan Calculator Price a personal loan with origination fees folded into the effective rate on… 3 Year Boat Loan Calculator Price a boat, RV or other recreational vehicle loan, which typically runs lon… 5 Year Boat Loan Calculator Price a boat, RV or other recreational vehicle loan, which typically runs lon… 7 Year Boat Loan Calculator Price a boat, RV or other recreational vehicle loan, which typically runs lon… 48 Month Lease Calculator Calculate a general lease payment from asset value, residual value, term and … 60 Month Lease Calculator Calculate a general lease payment from asset value, residual value, term and … 72 Month Lease Calculator Calculate a general lease payment from asset value, residual value, term and … 84 Month Lease Calculator Calculate a general lease payment from asset value, residual value, term and … 3 Year Rental Property Calculator Underwrite a rental: cash flow, cap rate, cash-on-cash return, and the 1% rul… 5 Year Rental Property Calculator Underwrite a rental: cash flow, cap rate, cash-on-cash return, and the 1% rul… 10 Year Rental Property Calculator Underwrite a rental: cash flow, cap rate, cash-on-cash return, and the 1% rul… 3 Year APR Calculator Fold origination fees and points into the rate to get the APR lenders must di… 5 Year APR Calculator Fold origination fees and points into the rate to get the APR lenders must di… 10 Year APR Calculator Fold origination fees and points into the rate to get the APR lenders must di… 3 Year FHA Loan Calculator Price an FHA loan including the upfront and annual mortgage insurance premium… 5 Year FHA Loan Calculator Price an FHA loan including the upfront and annual mortgage insurance premium… 10 Year FHA Loan Calculator Price an FHA loan including the upfront and annual mortgage insurance premium… 15 Year VA Mortgage Calculator Price a VA loan with the funding fee, which changes with your down payment an… 20 Year VA Mortgage Calculator Price a VA loan with the funding fee, which changes with your down payment an… 20 Year Home Equity Loan Calculator Find how much equity you can borrow and what the second-mortgage payment woul… 30 Year Home Equity Loan Calculator Find how much equity you can borrow and what the second-mortgage payment woul… 3 Year Rent vs. Buy Calculator Compare the total cost of renting and buying over your real time horizon, inc… 5 Year Rent vs. Buy Calculator Compare the total cost of renting and buying over your real time horizon, inc… 10 Year Rent vs. Buy Calculator Compare the total cost of renting and buying over your real time horizon, inc… 15 Year Mortgage Calculator UK Price a UK mortgage in pounds on either a repayment or interest-only basis, w… 20 Year Mortgage Calculator UK Price a UK mortgage in pounds on either a repayment or interest-only basis, w… 30 Year Mortgage Calculator UK Price a UK mortgage in pounds on either a repayment or interest-only basis, w… 15 Year Canadian Mortgage Calculator Price a Canadian mortgage with semi-annual compounding and accelerated paymen… 20 Year Canadian Mortgage Calculator Price a Canadian mortgage with semi-annual compounding and accelerated paymen… 30 Year Canadian Mortgage Calculator Price a Canadian mortgage with semi-annual compounding and accelerated paymen… 15 Year Mortgage Amortization Calculator Print a complete mortgage amortization schedule with yearly summaries and the… 20 Year Mortgage Amortization Calculator Print a complete mortgage amortization schedule with yearly summaries and the… 10 Percent Off Calculator Take 10% off any price and see exactly what you save. 20 Percent Off Calculator Take 20% off any price and see exactly what you save. 25 Percent Off Calculator Take 25% off any price and see exactly what you save. 40 Percent Off Calculator Take 40% off any price and see exactly what you save. 50 Percent Off Calculator Take 50% off any price and see exactly what you save. 3 Year Bond Yield Calculator Calculate a bond's current yield and approximate yield to maturity from price… 5 Year Bond Yield Calculator Calculate a bond's current yield and approximate yield to maturity from price… 3 Year Dividend Reinvestment Calculator Project a portfolio when dividends are reinvested, with share count compoundi… 5 Year Dividend Reinvestment Calculator Project a portfolio when dividends are reinvested, with share count compoundi… 10 Year Dividend Reinvestment Calculator Project a portfolio when dividends are reinvested, with share count compoundi… 15 Year Mortgage Overpayment Calculator See what a regular overpayment removes from a mortgage in time and in interes… 20 Year Mortgage Overpayment Calculator See what a regular overpayment removes from a mortgage in time and in interes… 30 Year Mortgage Overpayment Calculator See what a regular overpayment removes from a mortgage in time and in interes… 3 Year Smoking Cost Calculator Add up what smoking costs per week, per year and across a decade, with the in… 5 Year Smoking Cost Calculator Add up what smoking costs per week, per year and across a decade, with the in… 3 Year Bond Current Yield Calculator Calculate a bond's current yield and an approximate yield to maturity from it… 10 Year Bond Current Yield Calculator Calculate a bond's current yield and an approximate yield to maturity from it… 3 Year Car Depreciation Calculator Project a car's value over time, with the steeper first-year drop applied sep… 7 Year Car Depreciation Calculator Project a car's value over time, with the steeper first-year drop applied sep…

Fitness & Health Calculators

114 tools
BMI Calculator Calculate Body Mass Index from height and weight, and see which WHO category … Calorie Calculator Work out daily calorie needs with the Mifflin-St Jeor equation, adjusted for … Body Fat Calculator Estimate body fat percentage with the US Navy circumference method and compar… BMR Calculator Calculate the calories your body burns at complete rest, using Mifflin-St Jeo… Macro Calculator Split a calorie target into grams of protein, carbohydrate and fat for the di… Ideal Weight Calculator Compare ideal body weight across the Devine, Robinson, Miller and Hamwi formu… Pregnancy Calculator Track a pregnancy week by week: gestational age today, trimester, key milesto… Pregnancy Weight Gain Calculator Check pregnancy weight gain against Institute of Medicine guidelines for your… Pregnancy Conception Calculator Work backwards from a due date or last period to the likely conception window. Due Date Calculator Estimate a due date with Naegele's rule from your last period, a conception d… Pace Calculator Convert time and distance into pace and speed, and project finish times for c… Army Body Fat Calculator Run the US Army tape test (AR 600-9) and check the result against the standar… Carbohydrate Calculator Turn a calorie target and carb percentage into grams of carbohydrate per day … Lean Body Mass Calculator Estimate lean body mass with the Boer, James and Hume formulas or directly fr… Healthy Weight Calculator Show the healthy weight range for your height using the BMI 18.5–25 band, plu… Calories Burned Calculator Estimate calories burned in a workout from MET values, body weight and durati… One Rep Max Calculator Estimate a one-rep max from any set, and get a full percentage table for prog… Target Heart Rate Calculator Map your five training zones using maximum heart rate or the more accurate Ka… Protein Calculator Set a daily protein target based on body weight and training goal, with a per… Fat Intake Calculator Convert a fat percentage target into grams per day, with the saturated fat li… TDEE Calculator Calculate total daily energy expenditure and see the cutting, maintenance and… Ovulation Calculator Estimate ovulation and the six-day fertile window from your cycle length and … Conception Calculator Find the days you are most likely to conceive, based on ovulation timing and … Period Calculator Predict your next six periods, plus ovulation and PMS windows, from your cycl… GFR Calculator Estimate glomerular filtration rate with the 2021 CKD-EPI creatinine equation… Body Type Calculator Classify body shape from bust, waist and hip measurements, and see waist-to-h… Body Surface Area Calculator Calculate body surface area with the four standard clinical formulas used for… BAC Calculator Estimate blood alcohol concentration with the Widmark formula and the time un… Anorexic BMI Calculator Show where a BMI sits relative to clinical underweight thresholds, with the s… Weight Watcher Points Calculator Estimate a points value for a food from its calories, saturated fat, sugar an… Overweight Calculator See how far a weight sits above the healthy BMI band and what reaching the to… Steps to Miles Calculator Convert a step count into miles and kilometres using a stride length estimate… Miles to Steps Calculator Convert a distance into the number of steps it takes at your own stride lengt… Steps to Calories Calculator Estimate calories burned from a step count, adjusted for body weight, stride … How Long to Walk a Mile Calculator Estimate walking time for any distance at your own pace, with the average spe… Sobriety Calculator Count time since a sobriety date in years, months, days and total days, with … WHR Calculator Calculate waist-to-hip ratio and see the WHO risk band it falls into — a bett… Water Intake Calculator Estimate a daily fluid target from body weight, exercise and climate — with t… VO2 Max Calculator Estimate VO₂ max from the Cooper 12-minute run test. Waist to Height Ratio Calculator Calculate waist-to-height ratio, a simple predictor of metabolic risk that ou… Calories Burned Cycling Calculator Estimate calories burned on a bike ride from weight, duration and average spe… Calories Burned Swimming Calculator Estimate calories burned swimming, by stroke and intensity. Body Adiposity Index Calculator Estimate body fat percentage from hip circumference and height, without needi… Running Pace Converter Convert running pace between minutes per kilometre and minutes per mile, with… Sleep Cycle Calculator Work out how many complete 90-minute sleep cycles fit into the time you have. Caffeine Half-Life Calculator Track how much caffeine remains in your system over time, using your own half… Alcohol Units Calculator Convert drinks into UK units, US standard drinks and grams of alcohol, with t… BMI Prime Calculator Express BMI as a ratio to the upper healthy limit, which makes the distance f… Ponderal Index Calculator Calculate the ponderal index, which scales weight by height cubed rather than… Lean Body Mass from Body Fat Calculator Split body weight into lean and fat mass, with the goal weight a target body … Calories in Macros Calculator Convert grams of each macronutrient into calories and the share each contribu… Heart Rate Reserve Calculator Calculate heart rate reserve and the Karvonen training zones built from it. Bike Cadence and Speed Calculator Convert cadence and gearing into road speed, with gear ratio and development. Cycling Power Calculator Estimate the power a given speed demands, split between air, rolling resistan… Wheel Circumference Calculator Calculate wheel circumference for a bike computer from rim diameter and tyre … 90 Minute Sleep Cycle Calculator Work back from a wake time to bedtimes that land between sleep cycles rather … Sleep Debt Calculator Track accumulated sleep debt and how long repaying it would realistically tak… FFMI Calculator Calculate Fat-Free Mass Index, adjusted for height, and see how it compares w… Jackson-Pollock 3-Site Body Fat Calculator Estimate body fat percentage from three skinfold sites using the Jackson-Poll… Waist-to-Hip Ratio Calculator Calculate waist-to-hip ratio and compare it against WHO risk thresholds for c… One Rep Max Comparison Calculator Compare the two most-used one-rep-max formulas side by side, since they diver… Aquarium Bioload Calculator Estimate how heavily stocked a tank is against the classic inch-per-gallon gu… Aquarium Water Change Calculator Calculate how much water a routine change removes, and how quickly repeated p… BBT Time Adjustment Calculator Adjust a basal body temperature reading taken at an unusual wake time back to… Katch-McArdle BMR Calculator Calculate Basal Metabolic Rate from lean body mass using the Katch-McArdle fo… Carbohydrate Intake Calculator Calculate a suggested daily carbohydrate intake in grams from total calorie n… EER Calculator (Estimated Energy Requirement) Calculate Estimated Energy Requirement (EER) using the Institute of Medicine'… Dog Calorie & Nutrition Calculator Calculate a dog's daily calorie needs from body weight, activity level and ne… Glycemic Index Lookup Calculator Look up a food's glycemic index and calculate the glycemic load for your actu… Exclusive Pumping Freezer Stash Calculator Calculate how long it will take to build a target breast milk freezer stash b… Dog Walking Calorie Calculator Calculate calories burned during a dog walk based on your weight, walk durati… Added Sugar Intake Calculator Calculate a suggested daily added sugar limit based on the American Heart Ass… Total Body Water Calculator Estimate total body water volume using the widely used Watson formula, based … Body Frame Size Calculator Determine body frame size from the ratio of height to wrist circumference. Blood Volume Calculator Estimate total blood volume using the Nadler equations, with the per-kilogram… Blood Sugar Converter Convert blood glucose between mg/dL and mmol/L, the two units used in differe… Sweat Rate Calculator Measure sweat rate from a weigh-in before and after exercise, and the fluid i… Resting Metabolic Rate Calculator Calculate resting metabolic rate, which runs about 10% above basal rate becau… Maximum Heart Rate Calculator Estimate maximum heart rate with the three published formulas, which disagree… Fiber Intake Calculator Calculate a daily fibre target from calorie intake, with the age and sex guid… Protein Per Meal Calculator Split a daily protein target across meals, at the dose that actually stimulat… Ideal Weight for Height Calculator Calculate ideal body weight with the Devine formula, alongside the wider heal… Snow Shoveling Calories Calculator Estimate calories burned shovelling snow, an activity with a higher intensity… Kilometers to Steps Calculator Convert kilometres into steps using a stride estimated from your height. Swimming Pace Calculator Convert a swim time into pace per 100 m, with projections for other distances. Cycling Power to Weight Calculator Calculate cycling power-to-weight in watts per kilogram, the number that deci… Marathon Time Predictor Predict race times at other distances using Riegel's formula. Pace to Speed Converter Convert running pace into speed in km/h, mph and m/s. Treadmill Incline Calculator Estimate calories on a treadmill using the ACSM metabolic equation for walkin… BMI Calculator for Women Calculate BMI and see the healthy weight range, with the specific caveats tha… BMI Calculator in Pounds and Inches Imperial BMI: enter weight in pounds and height in feet and inches, with the … Weight Loss Calorie Calculator Set a daily calorie target for weight loss based on your own maintenance leve… Bulking Calorie Calculator Set a calorie surplus for muscle gain, sized to add mass without unnecessary … Calorie Calculator in Pounds and Inches Work out daily calorie needs with the Mifflin-St Jeor equation, adjusted for … Calorie Calculator for Women Work out daily calorie needs with the Mifflin-St Jeor equation, adjusted for … Body Fat Calculator in Pounds and Inches Estimate body fat percentage with the US Navy circumference method and compar… Body Fat Calculator for Women Estimate body fat percentage with the US Navy circumference method and compar… BMR Calculator in Pounds and Inches Calculate the calories your body burns at complete rest, using Mifflin-St Jeo… BMR Calculator for Women Calculate the calories your body burns at complete rest, using Mifflin-St Jeo… Ideal Weight Calculator in Pounds and Inches Compare ideal body weight across the Devine, Robinson, Miller and Hamwi formu… Ideal Weight Calculator for Women Compare ideal body weight across the Devine, Robinson, Miller and Hamwi formu… Army Body Fat Calculator for Women Run the US Army tape test (AR 600-9) and check the result against the standar… Lean Body Mass Calculator for Women Estimate lean body mass with the Boer, James and Hume formulas or directly fr… Healthy Weight Calculator in Pounds and Inches Show the healthy weight range for your height using the BMI 18.5–25 band, plu… TDEE Calculator in Pounds and Inches Calculate total daily energy expenditure and see the cutting, maintenance and… TDEE Calculator for Women Calculate total daily energy expenditure and see the cutting, maintenance and… BAC Calculator for Women Estimate blood alcohol concentration with the Widmark formula and the time un… Anorexic BMI Calculator in Pounds and Inches Show where a BMI sits relative to clinical underweight thresholds, with the s… Overweight Calculator in Pounds and Inches See how far a weight sits above the healthy BMI band and what reaching the to… 5,000 Steps to Miles Calculator Convert 5000 steps into miles and kilometres using your own stride length. 7,500 Steps to Miles Calculator Convert 7500 steps into miles and kilometres using your own stride length. 15,000 Steps to Miles Calculator Convert 15000 steps into miles and kilometres using your own stride length. 20,000 Steps to Miles Calculator Convert 20000 steps into miles and kilometres using your own stride length. WHR Calculator for Women Calculate waist-to-hip ratio and see the WHO risk band it falls into — a bett…

Math Calculators

213 tools
Scientific Calculator A full scientific calculator with trigonometry, logarithms, powers, roots, me… Fraction Calculator Add, subtract, multiply and divide fractions, with the answer simplified and … Percentage Calculator Every common percentage question in one place: percent of a number, percent c… Triangle Calculator Solve a triangle from three sides: area, perimeter, all three angles, height … Volume Calculator Calculate the volume of cubes, boxes, cylinders, spheres, cones, pyramids and… Standard Deviation Calculator Compute standard deviation, variance, mean, sum of squares and the full five-… Random Number Generator Generate one or many random numbers in any range, with or without duplicates. Number Sequence Calculator Generate arithmetic, geometric and Fibonacci sequences with the nth term and … Percent Error Calculator Compare an observed value with a true value to get percent error, absolute er… Exponent Calculator Raise any base to any power, including negative and fractional exponents. Binary Calculator Add, subtract, multiply, divide and run bitwise operations on binary numbers,… Hex Calculator Do arithmetic in hexadecimal and convert between hex, decimal, octal and bina… Half-Life Calculator Compute remaining quantity, decay constant and mean lifetime for any exponent… Quadratic Formula Calculator Solve ax² + bx + c = 0 with real or complex roots, plus the discriminant, ver… Slope Calculator Find slope, intercept, distance and angle between two points, and get the lin… Log Calculator Take a logarithm in any base, plus ln, log₁₀, log₂ and the antilogarithm. Area Calculator Calculate the area of eight common shapes, with the formula shown alongside e… Sample Size Calculator Find the sample size a survey needs for a chosen confidence level and margin … Probability Calculator Combine probabilities: intersection, union, complement, conditional probabili… Statistics Calculator Full descriptive statistics for a data set: mean, median, mode, range, quarti… Mean, Median, Mode, Range Calculator The four measures every statistics class starts with, computed together with … Permutation and Combination Calculator Calculate permutations, combinations, factorials and repetition variants for … Z-score Calculator Convert a raw score to a z-score and a percentile, and back again. Confidence Interval Calculator Build a confidence interval around a sample mean, with the standard error and… Ratio Calculator Solve proportions, simplify ratios, scale them up or down and convert to perc… Distance Calculator Distance and midpoint between two points using the Pythagorean distance formu… Circle Calculator Enter any one circle property and get radius, diameter, circumference and are… Surface Area Calculator Total and lateral surface area for six common solids. Pythagorean Theorem Calculator Solve for any missing side of a right triangle with a² + b² = c². Right Triangle Calculator Solve a right triangle: hypotenuse, both acute angles, area, perimeter and al… Root Calculator Square roots, cube roots and any nth root, including roots of decimals. Least Common Multiple Calculator Find the LCM of two or more numbers, with the prime factorization that produc… Greatest Common Factor Calculator Find the GCF of any set of numbers using the Euclidean algorithm, with all co… Factor Calculator List every factor and factor pair of a number, and tell you whether it is pri… Rounding Calculator Round to decimal places, significant figures or the nearest ten, hundred or t… Matrix Calculator Add, subtract and multiply matrices, or find a determinant, inverse or transp… Scientific Notation Calculator Convert between decimal, scientific, engineering and E notation, with signifi… Big Number Calculator Arithmetic on numbers far beyond normal precision, using exact big-integer ma… Prime Factorization Calculator Break a number into prime factors, shown in expanded and exponent form with a… Common Factor Calculator List every factor two or more numbers share, and highlight the greatest one. Basic Calculator A clean four-function calculator with percent, sign change and memory — no cl… Long Division Calculator Divide with the full long-division worked out step by step, including the rem… Average Calculator Mean, median, mode, sum and count for any list of numbers you paste in. P-value Calculator Convert a z, t or chi-square statistic into a p-value and check it against yo… Decimal to Fraction Calculator Convert any decimal into an exact fraction in lowest terms, including repeati… Hex to Decimal Converter Convert between hexadecimal, decimal, binary and octal in every direction, wi… Percentage Change Calculator Calculate percentage increase or decrease between two values, with the revers… Million to Billion Converter Convert between thousands, millions, billions, trillions and the Indian lakh … Triangle Area Calculator Calculate the area of a triangle from its base and perpendicular height. Circle Circumference Calculator Calculate the circumference of a circle from its radius, with area and diamet… Sphere Volume Calculator Calculate the volume and surface area of a sphere from its radius. Cylinder Volume Calculator Calculate the volume and surface area of a cylinder — the shape of most tanks… Cone Volume Calculator Calculate the volume, slant height and surface area of a cone. Trapezoid Area Calculator Calculate the area of a trapezoid (trapezium) from its two parallel sides and… Ellipse Area Calculator Calculate the area, eccentricity and approximate perimeter of an ellipse. Modulo Calculator Calculate the remainder after division, with both the mathematical and the pr… Factorial Calculator Calculate the factorial of any number, with the digit count and Stirling appr… Binomial Coefficient Calculator Calculate the binomial coefficient — the number of ways to choose k items fro… Arithmetic Sequence Calculator Find any term and the running sum of an arithmetic sequence. Geometric Sequence Calculator Find any term, the partial sum and the infinite sum of a geometric sequence. Midpoint Calculator Find the midpoint between two coordinates, with the distance and slope of the… Vector Magnitude Calculator Calculate the magnitude of a 2D or 3D vector and its unit vector components. Percent Increase Between Two Numbers Calculator Calculate the percentage change between any two numbers, in both directions. Rounding to Significant Figures Calculator Round any number to a chosen number of significant figures. Percentage Points Calculator Convert between a change in percentage points and the relative percentage cha… Weighted Average Calculator Calculate a weighted average and compare it against the plain mean. Ratio Simplifier Calculator Reduce a ratio to its simplest whole-number form. Prime Number Checker Check whether a number is prime, with its smallest factor and the nearest pri… Square Root Calculator Calculate square, cube and fourth roots, and check whether a number is a perf… Cube Root Calculator Calculate the cube root of any number, including negatives, with the perfect-… Absolute Value Calculator Find the absolute value of a number — its distance from zero, regardless of s… Scientific Notation Converter Convert any number into scientific notation, with its mantissa and order of m… Proportion Calculator Solve a proportion for the missing value by cross-multiplication. Percent to Decimal Converter Convert a percentage to a decimal and to the multiplier you actually use in a… Compound Growth Rate Calculator Find the constant per-period rate that turns a starting value into an ending … Exponential Decay Calculator Model exponential decay at a constant percentage rate, with the implied half-… Logarithm Base Converter Calculate a logarithm in any base using the change-of-base formula. Slope Intercept Form Calculator Find the slope-intercept equation of the line through two points. Quadratic Discriminant Calculator Calculate the discriminant of a quadratic and what it says about the roots. Standard Error Calculator Calculate the standard error of the mean and the margin of error it implies. Odds to Probability Converter Convert between odds and probability, with the decimal odds bookmakers quote. Combination with Repetition Calculator Count the ways to choose k items from n types when repeats are allowed. Z-Score to Percentile Converter Convert a z-score into a percentile using the standard normal distribution. Sine Calculator Calculate the sine of any angle in degrees or radians, with cosine and tangen… Cosine Calculator Calculate the cosine of any angle, with the other two primary ratios shown. Tangent Calculator Calculate the tangent of an angle, and read it as a gradient or roof pitch. Inverse Sine Calculator Find the angle whose sine is a given value, in degrees and radians. Inverse Cosine Calculator Find the angle whose cosine is a given value. Inverse Tangent Calculator Find the angle whose tangent is a given value — the conversion from gradient … Law of Cosines Calculator Solve a triangle from two sides and the included angle using the cosine rule. Law of Sines Calculator Solve a triangle from one side and two angles using the sine rule. Angle Between Two Vectors Calculator Calculate the angle between two 2D or 3D vectors from their dot product. Unit Vector Calculator Normalise a vector to length one, keeping its direction. Matrix Determinant Calculator Calculate the determinant of a 2×2 matrix, with the inverse and what the valu… 3x3 Matrix Determinant Calculator Calculate a 3×3 determinant by cofactor expansion, with the geometric meaning. Matrix Multiplication Calculator (2x2) Multiply two 2×2 matrices, row by column, with the determinant identity as a … Eigenvalue Calculator (2x2) Find the eigenvalues of a 2×2 matrix, with the trace and determinant checks t… Cross Product Calculator Calculate the cross product of two 3D vectors, which is perpendicular to both. Truncated Cone Volume Calculator Calculate the volume and surface area of a conical frustum — a cone with the … Rise Over Run Calculator Convert rise and run into slope, percentage, angle and ratio — the four ways … Volume of a Parallelepiped Calculator Calculate the volume of a parallelepiped from three edge vectors, using the s… Polar to Cartesian Coordinates Calculator Convert polar coordinates (r, θ) to Cartesian (x, y) coordinates. Triangular Numbers Calculator Calculate the nth triangular number — the sum of every whole number from 1 up… Vector Addition Calculator Add two vectors given as magnitude and angle, and get the resultant magnitude… Segment Addition Postulate Calculator Calculate the length of a segment using the Segment Addition Postulate: AB + … Parallel Line Calculator Find the equation of a line parallel to a given line and passing through a sp… Linear Interpolation Calculator Estimate an unknown value between two known data points using linear interpol… Quantity Converter (Dozen, Gross, Score) Convert between everyday counting units — dozen, half-dozen, score, gross, gr… Width of a Rectangle Calculator Find a rectangle's width from its area and known length. Polygon Interior Angle Calculator Calculate the sum of interior angles, and each angle of a regular polygon, fr… Divisor Calculator Find every divisor of a whole number, how many there are, and whether it is a… Decagon Calculator Calculate the area, perimeter and diagonals of a regular decagon (10-sided po… Cosecant Calculator Calculate the cosecant of an angle — the reciprocal of sine. Crore to Million Converter Convert between the Indian numbering system (lakh, crore) and the internation… Corner Point Calculator (Linear Programming) Find a corner point of a linear programming feasible region — the intersectio… Pi Estimation Calculator (Buffon's Needle) Estimate the value of π from a Buffon's needle experiment — dropping needles … Angle of Depression Calculator Calculate the angle of depression from an elevated observer down to an object… Cycloid Calculator Calculate a point on a cycloid — the curve traced by a point on the rim of a … Shannon Entropy Calculator Calculate the Shannon entropy of a probability distribution — a measure of it… Chord Length Calculator Calculate a circle's chord length from its radius and the central angle it su… Characteristic Polynomial Calculator (2×2 Matrix) Find the characteristic polynomial of a 2×2 matrix, and its eigenvalues, from… Relatively Prime Calculator Check whether two numbers are relatively prime (coprime) — sharing no common … SIR Epidemic Model Calculator (Educational) Run the classic SIR (Susceptible-Infected-Recovered) epidemic model — a stand… Multiplying Binomials Calculator (FOIL) Multiply two binomials of the form (ax+b)(cx+d) using the FOIL method, and ge… Multiplicative Inverse Calculator Find the multiplicative inverse (reciprocal) of a fraction, decimal, or whole… Heptagon Calculator Calculate the area, perimeter and diagonals of a regular heptagon (7-sided po… Lateral Surface Area of a Cylinder Calculator Calculate the lateral (curved side) surface area of a cylinder, excluding its… Queueing Theory Calculator (M/M/1) Calculate the key performance measures of a single-server queue (M/M/1) from … Zombie Outbreak Model Calculator (Illustrative) Simulate a simplified, fictional zombie outbreak using the same susceptible-i… Line of Intersection of Two Planes Calculator Find the direction vector of the line where two planes intersect, using the c… Exponential Form Calculator Convert any number into exponential (scientific) notation, with a coefficient… Polar Form Calculator (Complex Numbers) Convert a complex number from rectangular form (a + bi) to polar form (modulu… Greatest to Least Calculator Arrange a list of numbers from greatest to least (descending order). Condition Number Calculator (2×2 Matrix) Estimate the condition number of a 2×2 matrix from the ratio of its largest t… Harmonic Number Calculator Calculate the nth harmonic number — the sum of the reciprocals of every whole… Cotangent Calculator Calculate the cotangent of an angle — the reciprocal of tangent. Orthocenter of a Triangle Calculator Find the orthocenter of a triangle — the point where all three altitudes inte… Equation of a Plane Calculator Find the equation of a plane in 3D space from a point on the plane and its no… Million to Thousand Converter Convert between millions, thousands and billions — the international large-nu… Catenary Curve Calculator Calculate the shape of a catenary curve — the natural curve of a hanging cabl… Linear Combination Calculator (Vectors) Calculate the linear combination of two vectors, each scaled by its own scala… Double Angle Identities Calculator Calculate sin(2θ), cos(2θ) and tan(2θ) from a given angle θ using the double … Cholesky Decomposition Calculator (2×2 Matrix) Compute the Cholesky decomposition of a symmetric 2×2 matrix — factoring it i… Set Builder Notation Calculator Generate set-builder, interval and inequality notations for a numeric range f… Predator-Prey Model Calculator (Illustrative) Simulate the classic Lotka-Volterra predator-prey model to explore oscillatin… Mayan Numerals Converter Convert a decimal number into ancient Mayan numerals, using the base-20 dot-a… Exponential Growth Prediction Calculator Predict a future value from exponential growth at a constant rate per period,… Multiply Complex Numbers Calculator Multiply two complex numbers given in the form a + bi. Exponential Function Calculator Evaluate an exponential function b^x for any base and exponent. Perimeter of a Polygon Calculator Calculate the perimeter of a regular polygon from its number of sides and sid… Order of Magnitude Calculator Calculate the order of magnitude of a number — which power of 10 it is closes… Cuboid Calculator Calculate the volume, surface area and space diagonal of a cuboid (rectangula… Coterminal Angle Calculator Find the smallest positive or negative angle coterminal with a given angle (s… Arcsin Calculator Calculate the arcsine (inverse sine) of a value, returning the angle whose si… Star Polygon Calculator Calculate the area and perimeter of a regular star polygon from its number of… Substitution Method Calculator (Systems of Equations) Solve a system of two linear equations using the substitution method. Right Rectangular Pyramid Calculator Calculate the volume, base area and lateral surface area of a right rectangul… Length of a Rectangle Calculator Find a rectangle's length from its area and known width. Lowest Common Denominator Calculator Find the lowest common denominator (LCD) of two or three fractions, and the m… Constant of Proportionality Calculator Find the constant of proportionality k in a direct variation relationship y =… Parallelogram Perimeter Calculator Calculate the perimeter of a parallelogram from its two distinct side lengths. Hyperbolic Functions Calculator Calculate sinh(x), cosh(x) and tanh(x) — the hyperbolic sine, cosine and tang… Hexagonal Pyramid Calculator Calculate the volume and surface area of a pyramid with a regular hexagonal b… Equation of a Sphere Calculator Find the standard equation of a sphere from its center coordinates and radius… Circumcenter of a Triangle Calculator Find the circumcenter of a triangle — the center of the unique circle passing… Decimal to Octal Converter Convert a decimal (base 10) number to octal (base 8) notation. Lowest Terms Fraction Calculator Reduce a fraction to its lowest terms by dividing both numerator and denomina… Perimeter of a Quadrilateral Calculator Calculate the perimeter of any quadrilateral (four-sided shape) from its four… Simplifying Radicals Calculator Simplify a square root into its simplest radical form by extracting the large… Ceiling Function Calculator Calculate the ceiling of a number — the smallest integer greater than or equa… Diameter to Radius Converter Convert a circle's diameter to its radius. Archimedean Spiral Length Calculator Calculate the arc length of an Archimedean spiral between two angles. Dodecagon Calculator Calculate the area, perimeter and diagonals of a regular dodecagon (12-sided … Chinese Remainder Theorem Calculator Solve a system of simultaneous modular congruences using the Chinese Remainde… Bit Shift Calculator Perform left and right bit shifts, with the multiplication or division each i… Hexagon Area Calculator Calculate the area, perimeter and diagonals of a regular hexagon. Pentagon Area Calculator Calculate the area, apothem and radii of a regular pentagon. Octagon Area Calculator Calculate the area and widths of a regular octagon. Rhombus Area Calculator Calculate the area, side and angles of a rhombus from its diagonals. Parallelogram Area Calculator Calculate the area, perimeter and angles of a parallelogram. Circle Sector Area Calculator Calculate the area, arc length and chord of a circular sector. Arc Length Calculator Calculate arc length from radius and central angle, in degrees or radians. Surface Area of a Hemisphere Calculator Calculate the curved, base and total surface area of a hemisphere, plus its v… Torus Volume Calculator Calculate the volume and surface area of a torus from its major and minor rad… Pyramid Volume Calculator Calculate the volume, slant height and surface area of a square pyramid. Prism Volume Calculator Calculate the volume of any prism from its cross-sectional area and length. Diagonal of a Rectangle Calculator Calculate the diagonal of a rectangle from its sides — the calculation behind… Area of a Quadrilateral Calculator Calculate the largest possible area of a quadrilateral with four given sides. Triangle Hypotenuse Calculator Find the hypotenuse of a right triangle and both acute angles. Variance Calculator Calculate sample or population variance, with the standard deviation and mean… Covariance Calculator Calculate the covariance between two data sets, with the correlation it impli… Correlation Coefficient Calculator Calculate Pearson's correlation coefficient and the share of variance it expl… Linear Regression Calculator Fit a least-squares line to paired data, with slope, intercept and R². Quartile Calculator Calculate quartiles, the interquartile range and the outlier fences for any d… Outlier Calculator Find outliers using the 1.5 × IQR rule, with the upper and lower fences shown. Expected Value Calculator Calculate the probability-weighted average of several outcomes. Sample Mean Calculator Calculate the mean, sum and count of a data set, with the standard error of t… Coefficient of Variation Calculator Express standard deviation relative to the mean, so data sets of different sc… Chi-Square Calculator Calculate a chi-square statistic for observed against expected counts, with t… LCM of Two Numbers Calculator Find the least common multiple of two numbers, with the GCD it is derived fro… GCD of Two Numbers Calculator Find the greatest common divisor of two numbers using the Euclidean algorithm. Percentage of a Percentage Calculator Take one percentage of another and see how far that is from simply adding the… Fraction to Percent Converter Convert any fraction into a percentage and a decimal. Mixed Number to Improper Fraction Calculator Convert a mixed number into an improper fraction and a decimal. Rounding to Nearest Calculator Round a number to the nearest ten, hundred, thousand or any other multiple. Number Base Converter Convert a number between any two bases from 2 to 36. Scientific Notation Multiplication Calculator Multiply and divide numbers in scientific notation, with the exponent arithme… Triangle Angle Calculator Find the missing angle of a triangle and identify what kind of triangle it is. Slope Percentage Calculator Convert a rise and run into slope as a percentage, an angle and a ratio. Percentage Increase Calculator Work out the percentage increase between two numbers, and see what the same r… Percentage Decrease Calculator Calculate the percentage drop between two values, and the rise it would take … What Percent Is X of Y Calculator Find what percentage one number is of another — the calculation behind test s… Percent of a Number Calculator Find any percentage of any number instantly — 15% of a bill, 30% off a price,…

Other Calculators

205 tools
Age Calculator Calculate exact age in years, months and days, plus total weeks, days, hours … Date Calculator Add or subtract days, weeks, months and years from a date, or measure the gap… Time Calculator Add and subtract hours, minutes and seconds, with the answer in decimal hours… Hours Calculator Count hours between two clock times with breaks deducted, in decimal and hour… GPA Calculator Calculate semester and cumulative GPA on a 4.0, 4.3 or 5.0 scale from letter … Grade Calculator Work out your current weighted grade and the score you need on what is left t… Height Calculator Predict adult height with the mid-parental method, and convert freely between… Concrete Calculator Work out cubic yards and metres of concrete for slabs, footings, columns and … IP Subnet Calculator Turn an IP and CIDR prefix into network address, broadcast, mask, wildcard, h… Bra Size Calculator Convert underbust and bust measurements into a band and cup size, with US, UK… Password Generator Generate strong random passwords in your browser, with an entropy score. Noth… Dice Roller Roll any number of dice with any number of sides, with modifiers and a runnin… Conversion Calculator Convert length, weight, volume, temperature, area, speed, data, energy, press… Fuel Cost Calculator Price the fuel for a trip, split it between passengers, and see the cost per … Voltage Drop Calculator Calculate voltage drop and percentage drop for copper or aluminium conductors… BTU Calculator Size an air conditioner or heater in BTU for a room, adjusted for climate, in… Square Footage Calculator Measure floor area in square feet, yards and metres, with material cost and w… Time Card Calculator Add up a weekly timesheet with breaks, overtime and gross pay from clock-in a… Time Zone Calculator Convert a time between UTC offsets and see the day shift when it crosses midn… Love Calculator A light-hearted name compatibility score. Entertainment only — the algorithm … GDP Calculator Calculate GDP with the expenditure approach and derive per-capita and compone… Gas Mileage Calculator Convert distance and fuel used into MPG, L/100 km, km/L and cost per mile. Horsepower Calculator Convert torque and RPM into horsepower, kilowatts and metric PS. Engine Horsepower Calculator Estimate engine output from quarter-mile trap speed, elapsed time or a dyno t… Stair Calculator Design a code-compliant staircase: number of risers, exact riser height, trea… Resistor Calculator Combine resistors in series or parallel and solve voltage dividers, with powe… Ohms Law Calculator Enter any two of voltage, current, resistance or power and get the other two. Electricity Calculator Turn an appliance's wattage and usage into kWh, monthly cost, yearly cost and… Shoe Size Conversion Convert shoe sizes between US, UK, EU, Japanese cm and foot length in inches. Tip Calculator Split a bill and tip between any number of people, with 15/18/20% shown side … Mileage Calculator Calculate mileage reimbursement at the IRS or your own rate, and split busine… Density Calculator Density from mass and volume, converted to every common unit. Mass Calculator Find mass from density and volume, in grams, kilograms, pounds and newtons of… Weight Calculator Convert mass to weight on Earth and other worlds, and between kilograms, poun… Speed Calculator Solve for speed, distance or time, with every unit converted alongside. Molarity Calculator Calculate molarity, moles and the mass needed for any target concentration. Molecular Weight Calculator Parse a chemical formula and return molar mass with the contribution of each … Roman Numeral Converter Convert both ways between Arabic numbers and Roman numerals, from 1 to 3,999,… Golf Handicap Calculator Calculate a World Handicap System index from your score differentials, plus y… Sleep Calculator Find bedtimes and wake times that land between 90-minute sleep cycles, so you… Tire Size Calculator Compare two tire sizes for overall diameter, circumference, sidewall height, … Roofing Calculator Turn footprint and pitch into roof area, roofing squares, bundles of shingles… Tile Calculator Count the tiles a floor or wall needs, including grout gaps, waste allowance … Mulch Calculator Calculate cubic yards of mulch, the number of bags, and what it costs to cove… Gravel Calculator Calculate cubic yards and tons of gravel or crushed stone for a driveway, pat… Wind Chill Calculator Calculate the wind chill 'feels like' temperature and the frostbite exposure … Heat Index Calculator Calculate the heat index from temperature and humidity, with the NOAA risk ca… Dew Point Calculator Calculate dew point with the Magnus formula, plus the comfort level that dew … Bandwidth Calculator Convert file size and connection speed into transfer time, and Mbps into MB/s. Base64 Encode / Decode Encode text to Base64 or decode it back, entirely in your browser with full U… URL Encode / Decode Percent-encode and decode URLs and query strings, with both component and ful… Time Duration Calculator Measure the exact duration between two dates and times in years, days, hours,… Day Counter Count the days, weeks, weekdays or weekends between two dates. Day of the Week Calculator Find the weekday for any date, plus week number, day of year and whether it i… Age Difference Calculator Work out the exact gap between two birth dates in years, months and days, plu… Chronological Age Calculator Calculate chronological age to the exact year, month and day — the format psy… Days From Today Calculator Find the exact date a given number of days from today, forwards or backwards,… Days Until Calculator Count down to any date: days remaining, plus weeks, business days and the sha… Days Between Dates Calculator Count the exact number of days between two dates, with business days, weekend… Generation Calculator Find which generation a birth year falls into, with the date ranges each labe… Birthday Calculator Everything a birth date tells you: exact age, the weekday you were born on, d… Final Grade Calculator Work out the score you need on a final exam to finish with the grade you want… University Grade Calculator Average weighted module marks into a degree classification, in UK honours ban… Pizza Size Calculator Compare two pizzas by area and price per square centimetre, and see how much … Dog Age Calculator Convert a dog's age into human-equivalent years using size-adjusted veterinar… Cat Age Calculator Convert a cat's age to human-equivalent years using the standard feline life-… Aspect Ratio Calculator Resize any width or height while keeping the original proportions, with the a… Screen Size Calculator Turn a screen's diagonal measurement into its actual width, height and viewin… Battery Life Calculator Estimate how long a battery lasts at a given current draw, with the usable-ca… Battery Charge Time Calculator Estimate charging time from battery capacity, charger current and the current… Drive Time Calculator Estimate total journey time including breaks, with fuel use and cost for the … Gear Ratio Calculator Calculate gear ratio, output speed and torque multiplication from tooth count… Engine Displacement Calculator Calculate engine displacement from bore, stroke and cylinder count. Towing Capacity Calculator Work out the maximum trailer weight a vehicle can legally and safely tow. Tire Pressure Calculator Estimate a starting tyre pressure from the load each tyre carries against its… Fuel Cost Per Mile Calculator Work out what each mile or kilometre costs in fuel at your own economy and fu… Turkey Cooking Time Calculator Calculate roasting time for a turkey by weight, stuffed or unstuffed, with re… Meat Roasting Time Calculator Calculate roasting time and target internal temperature by joint weight and d… Coffee Ratio Calculator Work out how much ground coffee a given volume of water needs at your preferr… Rice to Water Ratio Calculator Calculate the water each type of rice needs, by weight, with cooking time and… Party Food Calculator Estimate food, drink and supplies for a party from guest count and event leng… Pizza Dough Calculator Scale a pizza dough recipe by baker's percentages, from the number and size o… Tip Split by Percentage Calculator Split a bill and tip between a group, with one person able to cover extra. Flight Time Calculator Estimate total flight time from distance and cruise speed, including taxi and… Jet Lag Recovery Calculator Estimate how long jet lag takes to clear, based on zones crossed and directio… Luggage Weight Calculator Check remaining baggage allowance and what any excess would cost. Road Trip Cost Calculator Budget a road trip across fuel, accommodation and food, split between travell… Age in Weeks Calculator Convert an age in years into weeks, days and hours. Reading Time Calculator Estimate reading and speaking time from a word count, at your own reading spe… Typing Speed Calculator Calculate gross and net typing speed in words per minute, with accuracy. Dog Food Portion Calculator Estimate a dog's daily food portion from body weight, activity level and the … Cat Food Portion Calculator Estimate a cat's daily portion from weight and life stage, with the water int… Aquarium Volume Calculator Calculate real water volume in an aquarium after substrate, with the filter t… Study Time Calculator Plan study hours from a page count, reading speed and the review time retenti… Exam Score Percentage Calculator Convert marks into a percentage and check it against the pass mark. Class Attendance Calculator Track attendance percentage and how many more classes you must attend — or ca… Word Count to Pages Calculator Convert a word count into pages at common academic spacing settings. Slide Count Calculator Work out how many slides a talk of a given length needs, with the word count … Grade Point Average Converter Convert a percentage grade between the US 4.0 scale, UK honours bands and the… Test Grade Curve Calculator See what different grading curves do to a raw score. Cooking Time Adjustment Calculator Adjust cooking time when you change the oven temperature, with the caution th… Recipe Scaling Calculator Scale any ingredient quantity from one serving count to another. Freezer Storage Time Calculator Check recommended freezer storage times for common foods, for quality rather … Baby Age Calculator Convert a baby's date of birth into weeks, months and days — the three units … Baby Formula Calculator Estimate daily formula volume from a baby's weight, using the standard 150 mL… Aquarium Salinity Calculator Calculate how much salt mix to add to raise a marine tank from its current sp… TV Series Duration Calculator Calculate the total time to watch every episode of a TV series, from episode … Social Media Time Cost Calculator Calculate how many hours a daily social media habit adds up to over months or… PPI Calculator (Pixels Per Inch) Calculate a screen's pixel density (pixels per inch) from its resolution and … Toilet Paper Calculator Estimate how many rolls of toilet paper a household uses per month and per ye… Key Signature Calculator Find the number of sharps or flats, and the relative minor key, for any major… Point Buy Calculator (D&D 5e) Calculate the point cost of D&D 5th edition ability scores under the standard… Title Case Converter Convert text to title case, following standard capitalization rules for headl… PERT Estimation Calculator Calculate an expected project duration from optimistic, most likely and pessi… MOA Calculator (Minute of Angle) Convert a scope adjustment in MOA (minute of angle) into inches of point-of-i… Lost Socks Calculator Estimate how many socks a household loses per year based on typical laundry l… Arrow FOC Calculator (Front of Center) Calculate an arrow's FOC (Front of Center) percentage from its length and bal… Bike Gear Ratio Calculator Calculate a bicycle's gear ratio, development distance and resulting speed fr… Silver Melt Value Calculator Calculate the melt value of a silver item from its weight, purity and the cur… Wet Bulb Temperature Calculator Estimate wet bulb temperature from dry bulb temperature and relative humidity… Hand Sanitizer Supply Calculator Calculate how long a bottle of hand sanitizer will last based on daily usage. Minutes Between Two Times Calculator Calculate the number of minutes elapsed between two clock times. Party Drink Calculator Estimate how many drinks to buy for a party based on guest count, duration an… Telescope Magnification Calculator Calculate a telescope's magnification from its focal length and the eyepiece … Tennis Ball Usage Calculator Estimate how many tennis balls a player or club needs per year based on pract… Gold Melt Value Calculator Calculate the melt value of a gold item from its weight, karat purity and the… Roulette Payout Calculator Calculate a roulette bet's payout, true odds and house edge for any bet type … GWA Calculator (Philippines) Calculate your General Weighted Average (GWA) on the Philippine 1.00–5.00 col… NFL Passer Rating Calculator Calculate the official NFL passer rating from completions, attempts, yards, t… Lowercase to Uppercase Converter Convert any text to uppercase letters instantly. Decimal Odds Calculator Calculate payout and implied probability from decimal betting odds. Magic Number Calculator (Sports) Calculate a sports team's magic number — the combined leader wins and rival l… Face Shape Calculator Determine your face shape (oval, round, square, heart, diamond, or oblong) fr… Encounter Difficulty Calculator (D&D 5e) Calculate encounter difficulty in D&D 5th edition from party level, party siz… Glitch Text Generator Generate 'glitched' or 'zalgo' text by stacking Unicode combining characters … How Many Tables Calculator (Event Planning) Calculate how many tables are needed for an event based on guest count and se… Blink-free Photo Calculator Calculate how many photos to take to reach a target confidence of getting at … Books vs e-Books Cost Calculator Compare the total cost of buying physical books versus e-books, including the… Bicycle Chain Lubricant Cost Calculator Calculate the cost per mile of chain lubricant, based on bottle price, usage … IP Address Converter Convert an IPv4 address between dotted-decimal, binary, hexadecimal and 32-bi… Trick-or-Treat Candy Calculator Calculate how much Halloween candy to buy based on expected trick-or-treaters… 120 Day Calculator Calculate the exact date 120 days from any given start date. New Year Countdown Calculator Calculate exactly how many days, hours and minutes remain until midnight on N… Mirror Text Generator Generate mirrored text using Unicode characters that visually resemble revers… TV Time Alternatives Calculator Calculate how many hours are spent watching TV over months or years, and what… Vertical Exaggeration Calculator Calculate the vertical exaggeration factor of a map or geologic cross-section… Upside-Down Text Generator Generate upside-down text using Unicode characters that visually resemble eac… 180 Day Calculator Calculate the exact date 180 days from any given start date. GVWR Payload Calculator Calculate a vehicle's maximum payload capacity from its GVWR and curb weight. Leap Year Calculator Check whether a given year is a leap year, including the century-year excepti… Numbers to Letters Converter Convert a number to its corresponding letter of the alphabet (1=A, 2=B, and s… Freight Class Estimator (NMFC Density-Based) Estimate NMFC freight class from shipment density (weight and dimensions), th… ACFT Score Calculator (Army Combat Fitness Test) Estimate Army Combat Fitness Test (ACFT) event scores using simplified, appro… Amdahl's Law Calculator Calculate the theoretical speedup from parallelizing part of a program, using… Chances of Having Twins Calculator Estimate the population-level chance of a twin pregnancy based on maternal ag… Fractional Odds Calculator Calculate profit and implied probability from fractional (UK-style) betting o… Polish Notation Converter (Infix to Prefix/Postfix) Convert a standard infix mathematical expression into prefix (Polish) or post… Burndown Chart Calculator Calculate current velocity and projected completion date from burndown progre… Snowman Building Calculator Calculate the size of each snowball needed for a classic three-tiered snowman… Chmod Calculator (Unix Permissions) Convert Unix/Linux file permissions between checkbox selections, symbolic not… Dog Life Expectancy Calculator Estimate a dog's typical life expectancy based on breed size category, a well… Propeller Slip Calculator Calculate propeller slip — the percentage difference between a propeller's th… Tap Water vs Bottled Water Cost Calculator Compare the annual cost of bottled water against tap water to see the potenti… Guitar Fret Position Calculator Calculate the exact position of any fret on a guitar or stringed instrument f… Parity Bit Calculator Calculate the parity bit needed to make a binary data string have even or odd… GRP Calculator (Gross Rating Point) Calculate Gross Rating Points (GRP) — a standard advertising media metric — f… Yes or No Random Generator Get a random Yes or No answer — a simple 50/50 random choice generator. Container Loading Calculator Estimate how many boxes of a given size fit into a shipping container using s… Hiking Time Calculator (Naismith's Rule) Estimate hiking time from distance and total elevation gain using Naismith's … Mega Millions Payout Calculator Estimate the lump sum and after-tax payout for a Mega Millions jackpot. CPS to Hz Converter (Cycles Per Second) Convert cycles per second (cps) to hertz (Hz) — the same underlying frequency… Chord Inversion Identifier Identify whether a triad is in root position, first inversion, or second inve… Reduce Your Plastic Consumption Calculator Calculate your annual single-use plastic consumption and see the impact of se… Small Text Generator Convert text into small caps using Unicode small-caps letterforms. Bath vs. Shower Water Cost Calculator Compare the water cost and usage of a typical bath versus a typical shower. XOR (Exclusive OR) Calculator Calculate the XOR (exclusive OR) of two binary values, and compare with AND a… Standard Drink Unit Calculator Convert a beverage's volume and alcohol content into standard drink units — t… Roll Length Calculator Calculate the length of material wound onto a roll from its outer diameter, c… Lung Volume Relationships Calculator Calculate the standard derived lung capacities (vital capacity, total lung ca… Heptathlon Score Calculator Calculate IAAF/World Athletics points for individual heptathlon events using … Reverse Text Generator Reverse any text string, character by character. Camera Field of View Calculator Calculate a camera lens's horizontal field of view (angle of view) from focal… Telescope True Field of View Calculator Calculate the true (actual sky) field of view seen through a telescope eyepie… Subscript Text Generator Convert numbers and select characters into Unicode subscript form — useful fo… Stride Length Calculator Estimate stride length from height — useful for calibrating a pedometer or fi… GWAM Calculator (Gross Words a Minute) Calculate Gross Words a Minute (GWAM) — the standard typing speed measure, fr… Cyber Monday Deal Calculator Evaluate whether a Cyber Monday or sale deal is genuinely worth it, comparing… CTR Calculator (Click-Through Rate) Calculate Click-Through Rate (CTR) — the percentage of impressions that resul… Italic Text Generator Convert text into italic-styled Unicode characters, usable anywhere plain tex… Semitone Frequency Calculator Calculate the resulting frequency after shifting a musical note by a given nu… Blood Type Inheritance Calculator See the possible ABO blood types a child could inherit from two parents, base… Transmission Gear Ratio Calculator (Vehicle) Calculate vehicle speed from engine RPM, transmission gear ratio, final drive… Fish Mercury Content Calculator Estimate mercury intake from a fish serving and compare against published FDA… Anatomical Dead Space Volume Calculator Estimate anatomical dead space volume — the portion of each breath that never… Fishing Reel Line Capacity Calculator Estimate how much fishing line of a given diameter fits onto a reel spool. Minutes to Decimal Calculator Convert hours and minutes into the decimal hours payroll systems require. Download Time Calculator Estimate how long a file takes to download at a given connection speed, with … Password Entropy Calculator Calculate password entropy in bits and the time a brute-force attack would ne… Data Usage Calculator Estimate monthly mobile or broadband data use from streaming, music and brows… Chilled Drink Calculator Estimate how long a drink takes to reach a target temperature by each cooling… Ideal Egg Boiling Calculator Calculate boiling time from egg weight, starting temperature and how set you … 20 Percent Tip Calculator Calculate a 20% tip and split the bill, with 15% and 18% shown for comparison. 15 Percent Tip Calculator Work out a 15% tip on any bill and split it between any number of people. 22 Percent Tip Calculator Work out a 22% tip on any bill and split it between any number of people. 25 Percent Tip Calculator Work out a 25% tip on any bill and split it between any number of people.

Cooking & Baking

4 tools
Cooking Converter Convert any recipe measurement between cups, spoons, grams, ounces and millil… Air Fryer Converter Convert any conventional oven recipe to air fryer temperature and time, with … Baking Conversions Calculator Convert baking ingredients to grams and scale a whole recipe up or down in on… Oven Temperature Converter Convert oven temperatures between Celsius, Fahrenheit and British gas marks, …

Pay & Salary

14 tools
Hourly to Salary Calculator Convert an hourly rate into weekly, biweekly, monthly and annual pay, with ov… Salary to Hourly Calculator Convert an annual salary into the hourly rate it really represents — includin… Overtime Calculator Calculate a week's gross pay with overtime and double-time at any multiplier,… Time and a Half Calculator Work out time-and-a-half pay for any hourly rate, with the premium shown sepa… Pay Raise Calculator See what a raise is worth per month and per hour — and whether it is actually… Hourly Rate for Freelancers Calculator Work backwards from the income you need to the hourly rate you must charge, w… Employee Cost Calculator Work out what an employee actually costs once employer taxes, pension and ove… Meeting Cost Calculator Put a price on a recurring meeting, using loaded hourly cost across everyone … Productivity Rate Calculator Measure output per hour against a target rate, with the time each unit takes. PTO Accrual Calculator Work out accrued and remaining annual leave part-way through a year. Project Hours Calculator Estimate total project effort with contingency, and turn it into calendar tim… Overtime Pay Percentage Calculator See how much of your pay comes from overtime, weekly and annualised. Salary Increase Percentage Calculator Work out the percentage increase between an old and a new salary. Contractor vs Employee Calculator Compare a contract rate against a salary once benefits, expenses and self-emp…

Home & Garden

91 tools
CBM Calculator Calculate cubic metres for a shipment, plus volumetric weight and the chargea… Cubic Feet Calculator Calculate cubic feet from measurements in feet, inches, metres or centimetres… Cubic Yards Calculator Turn an area and a depth into cubic yards, the unit concrete, soil, mulch and… Flooring Calculator Work out how many boxes of flooring a room needs, including waste, plus total… Asphalt Calculator Calculate tons of hot-mix asphalt for a driveway or lot from area and compact… LED Savings Calculator Compare running costs between old bulbs and LEDs across a whole house, with t… Miles Per kWh Calculator Measure real electric-vehicle efficiency in miles per kWh and convert it into… MPGe Calculator Convert electric-vehicle consumption into MPGe using the EPA's 33.705 kWh-per… Paint Calculator Work out how many litres of paint a room needs, with doors and windows deduct… Wallpaper Calculator Calculate how many rolls of wallpaper a room needs, including the waste a pat… Brick Calculator Calculate how many bricks a wall needs, with mortar allowance and waste, for … Drywall Calculator Calculate sheets of drywall for walls and ceiling, with waste, screws, tape a… Grass Seed Calculator Work out how much grass seed a lawn needs for new sowing or overseeding, with… Sod Calculator Calculate rolls of sod or turf for an area, with waste for cutting around cur… Plywood Calculator Calculate how many sheets of plywood or OSB an area needs, with waste and cos… Fence Calculator Calculate posts, panels and rails for a fence run, with total material cost. Insulation Calculator Calculate rolls or batts of insulation for a loft, wall or floor area, with c… Snow Load Calculator Estimate the weight of snow sitting on a roof, using the density of the snow … Pool Volume Calculator Calculate the water volume of a rectangular, round or oval pool with a slopin… Deck Calculator Calculate decking boards, joists and linear metres for a deck, with material … Firewood Calculator Measure a stack of firewood in cubic metres and cords, with the solid-wood fr… Lawn Mowing Cost Calculator Price a lawn mowing job per cut, per month and per season, with the time it s… Solar Panel Output Calculator Estimate daily, monthly and annual generation from a solar array, with the bi… Generator Size Calculator Size a generator from your running load plus the largest motor starting surge… Electricity Bill Calculator Estimate an electricity bill from usage, unit rate and standing charge. Appliance Running Cost Calculator Work out what any appliance costs to run per use, per month and per year. Fertilizer Calculator Calculate how much fertiliser an area needs and how much actual nitrogen that… Soil Volume Calculator Calculate the soil or compost a raised bed or border needs, in cubic metres, … Plant Spacing Calculator Work out how many plants a bed holds at a given spacing, in square or triangu… Bulb Spacing Calculator Calculate how many flower bulbs a bed needs at a chosen spacing, with cost. Mulch Depth Calculator Calculate mulch by volume for a given depth, in litres, cubic metres and bags. Carpet Calculator Calculate carpet area, linear metres from the roll and total cost including w… Curtain Fabric Calculator Calculate curtain fabric from window width, drop and fullness, including hem … Wallpaper Paste Calculator Work out how many packs of wallpaper paste a job needs. Ladder Angle Calculator Work out the ladder length and base distance a safe working angle requires. Concrete Slab Calculator Calculate concrete for a slab in cubic metres, cubic yards and bags, with wei… Rebar Calculator Calculate rebar length, bar counts and tie points for a reinforced slab grid. Stud Calculator Calculate studs, plates and total timber for a stud wall at any spacing. Roof Pitch Calculator Convert between roof pitch in degrees, ratio and percentage, with the rafter … Gravel Driveway Calculator Calculate gravel volume, weight, bulk bags and cost for a driveway or path. Water Tank Volume Calculator Calculate the capacity of a rectangular or cylindrical tank in cubic metres, … Rainwater Harvesting Calculator Estimate how much rainwater a roof can collect annually, and the tank size th… Septic Tank Size Calculator Estimate the minimum septic tank volume for a household, based on occupancy a… Paint Coverage Per Litre Calculator Convert an area and coat count into litres of paint and the tin sizes to buy. Tile Grout Calculator Calculate grout quantity from tile size, joint width and tile thickness. Wood Screws Calculator Count the screws a decking or cladding job needs, with a sensible extra allow… Board Feet Calculator Calculate board feet of lumber and the cost, from nominal thickness, width an… Stair Stringer Calculator Calculate risers, treads, total run and stringer length for a flight of stair… Pipe Volume Calculator Calculate the volume of water a pipe holds, from internal diameter and length. Water Flow Rate Calculator Measure flow rate from a timed volume — the bucket test every plumber uses. HVAC Tonnage Calculator Estimate cooling capacity in tons and kilowatts from floor area, climate and … Concrete Driveway Cost Calculator Estimate the cost of a concrete driveway from area, thickness and local mater… Metal Roof Cost Calculator Estimate metal roofing cost, with the pitch multiplier that turns footprint i… Roof Shingle Calculator Calculate shingle bundles, squares and underlay for a pitched roof, with wast… Wire Size Calculator by Amps Size a conductor so voltage drop stays within limits over the run, for copper… Pond Volume Calculator Calculate pond volume, the pump flow it needs and the liner size to buy. Aquarium Glass Thickness Calculator Estimate the glass thickness an aquarium needs, driven almost entirely by wat… Solar Panel Wattage Calculator Size a solar array from daily consumption, peak sun hours and panel rating. DIY Shed Cost Calculator Estimate the material cost of building a shed from floor, wall and roof areas. Appliance Wattage Calculator Estimate an appliance's daily and annual electricity use and cost from typica… Mortar Calculator Calculate the volume of mortar, and the cement and sand it needs, for a brick… Miter Angle Calculator Calculate the miter (mitre) saw angle needed to join pieces into a regular po… Bean Bag Filling Calculator Estimate how much filling (beans, foam, or fill material) a bean bag chair or… Quilt Backing Calculator Calculate how much backing fabric a quilt needs, including overhang and any s… Quilt Binding Calculator Calculate how much fabric to cut for a quilt's binding, based on the quilt's … Salt Dough Calculator Calculate how much flour, salt and water to make salt dough for a given numbe… Paver Sand Calculator Calculate how much bedding sand is needed under a paver patio or walkway. Spindle Spacing Calculator (Stairs/Deck Railing) Calculate how many spindles (balusters) are needed to fill a railing opening … Pleated Skirt Fabric Calculator Calculate how much fabric is needed for a pleated skirt, based on waist measu… Pine Straw Mulch Calculator Calculate how many bales of pine straw are needed to mulch a garden bed at a … Christmas Tree Size Calculator Calculate the maximum Christmas tree height that fits your ceiling, accountin… Mare Gestation Calculator Estimate a mare's expected foaling date from her breeding date, using the ave… Sonotube Concrete Calculator Calculate how much concrete is needed to fill a given number of cylindrical s… Curtain Panel Fabric Calculator Calculate how much fabric is needed for curtain panels based on window size a… Cow Gestation Calculator Estimate a cow's expected calving date from her breeding date, using the aver… Epoxy Resin Mixing Calculator Calculate how much epoxy resin and hardener to mix for a given surface area a… Rabbit Gestation Calculator Estimate a rabbit's expected kindling (birth) date from her breeding date. Pyramid Retaining Wall Block Calculator Calculate the total number of blocks needed for a stepped (pyramid-style) ret… CO2 Grow Room Calculator Calculate how much CO2 gas is needed to raise a grow room or tent to a target… Wainscoting Panel Calculator Calculate how many wainscoting panels are needed to cover a wall width, and t… Llama Gestation Calculator Estimate a llama's expected delivery (cria birth) date from her breeding date. Tree Planting Spacing Calculator Calculate how many trees fit in a given area at a specified planting spacing. Vegetable Seed Quantity Calculator Calculate how many vegetable seeds to plant per row, accounting for spacing a… Dog Heat Cycle Calculator Estimate when a female dog's next heat cycle is likely to begin, based on her… Hot Tub Operating Cost Calculator Estimate the daily, monthly and annual cost of running a hot tub, based on he… Chicken Coop Size Calculator Size a coop, run, perches and nest boxes for a flock, by bird size. Firewood BTU Calculator Compare the heat output of different firewood species, adjusted for stove eff… Wallpaper Cost Calculator Price a wallpapering job across materials and labour, with the DIY saving sho… Air Conditioner BTU Calculator Size an air conditioner in BTU for a room, adjusted for ceiling height, sun, … Humidity Comfort Calculator Check indoor humidity against the comfort and mould-risk ranges, using the de… Heating Oil Usage Calculator Work out how long heating oil will last and when to reorder before the tank r…

Physics

93 tools
Kinetic Energy Calculator Calculate the kinetic energy of a moving object from its mass and speed, with… Potential Energy Calculator Calculate gravitational potential energy from mass, height and local gravity,… Free Fall Calculator Work out how fast something is travelling after falling a given height, and h… Projectile Motion Calculator Calculate the range, flight time and peak height of a projectile from its lau… Momentum Calculator Calculate linear momentum and the force needed to stop it in a given time. Acceleration Calculator Calculate average acceleration from a change in velocity over time, expressed… Force Calculator Calculate force from mass and acceleration, converted to newtons, kilogram-fo… Centripetal Force Calculator Calculate the inward force needed to keep an object moving in a circle, and t… Gravitational Force Calculator Calculate the gravitational attraction between two masses using Newton's law … Escape Velocity Calculator Calculate the speed needed to escape a body's gravity entirely, with the circ… Terminal Velocity Calculator Calculate the speed at which drag balances weight, so a falling object stops … Pendulum Period Calculator Calculate the period and frequency of a simple pendulum from its length. Wavelength Calculator Convert between wave speed, frequency and wavelength for light, sound or any … Ohm's Law Power Calculator Calculate electrical power from voltage and current, with resistance and hour… Specific Heat Calculator Calculate the energy needed to change a material's temperature, with the time… Density Altitude Calculator Calculate density altitude from elevation, temperature and altimeter setting … Work Calculator Calculate mechanical work from force, distance and the angle between them. Power Calculator Calculate power as the rate of doing work, in watts, kilowatts and horsepower. Efficiency Calculator Calculate the efficiency of any machine or process as useful output over tota… Angular Velocity Calculator Convert rotational speed into angular velocity, tangential speed and centripe… Torque Calculator Calculate torque from force, lever arm length and the angle between them. Density Calculator (Mass and Volume) Calculate density from mass and volume, with the buoyancy check that follows … Pressure Calculator Calculate pressure from force and area, converted to pascals, bar, psi and at… Hydrostatic Pressure Calculator Calculate the pressure a column of fluid exerts at a given depth. Buoyant Force Calculator Calculate the upward force a fluid exerts on a submerged or floating object. Wave Frequency Calculator Calculate wave frequency from speed and wavelength, for sound, light or any o… Sound Intensity Level Calculator Convert sound intensity into decibels, with the perceived loudness change it … Coulomb's Law Calculator Calculate the electrostatic force between two point charges. Capacitor Energy Calculator Calculate the energy and charge stored in a capacitor at a given voltage. Resistivity Calculator Calculate the resistance of a conductor from its resistivity, length and cros… Transformer Turns Ratio Calculator Calculate transformer turns ratio, secondary turns and the current transforma… Heat Transfer Rate Calculator Calculate conductive heat loss through a wall or insulation layer, with the R… Wire Gauge Calculator Size a copper conductor so the voltage drop stays within your limit over the … Hydroelectric Power Calculator Calculate hydroelectric output from flow rate, head and turbine efficiency. Bullet Energy Calculator Calculate a bullet's kinetic energy at the muzzle from its weight in grains a… Coefficient of Discharge Calculator Calculate an orifice's coefficient of discharge from its theoretical and actu… Tension Calculator (Hanging Mass) Calculate the tension in two ropes supporting a hanging mass at different ang… Laser Beam Expander Calculator Calculate the output beam diameter and magnification of a two-lens laser beam… Hydraulic Jump Calculator Calculate the downstream (sequent) depth after a hydraulic jump from the upst… Kinematic Viscosity of Air Calculator Calculate air's dynamic and kinematic viscosity at a given temperature using … Angle of Impact Calculator Calculate the angle at which a projectile strikes the ground from its horizon… Spherical Capacitor Calculator Calculate the capacitance of two concentric charged spheres from their radii. Solenoid Magnetic Field Calculator Calculate the magnetic field inside an ideal solenoid from its turns, length … Bohr Model Energy Level Calculator Calculate the energy of an electron in a given orbit of a hydrogen-like atom … Exoplanet Travel Time Calculator Calculate how long it would take to travel to a given exoplanet at a specifie… Darcy-Weisbach Head Loss Calculator Calculate head loss due to friction in a pipe using the Darcy-Weisbach equati… Rolling Resistance Calculator Calculate rolling resistance force from a vehicle's mass and its tyres' rolli… Cyclotron Frequency Calculator Calculate the cyclotron (gyrofrequency) of a charged particle moving in a mag… Hohmann Transfer Orbit Calculator Calculate the delta-v and transfer time for a Hohmann transfer between two ci… Schwarzschild Radius Calculator Calculate the Schwarzschild radius — the event horizon size — for an object o… Pulley System Calculator Calculate the effort force needed to lift a load using a pulley system, from … Brewster's Angle Calculator Calculate Brewster's angle — the angle of incidence at which reflected light … Temperature at Altitude Calculator Estimate air temperature at a given altitude using the standard atmospheric l… Angle of Incidence Calculator (Optics) Calculate the angle of refraction from the angle of incidence using Snell's l… Frequency of Light Calculator Calculate the frequency of a light wave from its wavelength. Thermal Conductivity Calculator Calculate a material's thermal conductivity from measured heat flow, using Fo… SUVAT Calculator (Kinematics) Solve the SUVAT equations of motion for an object moving with constant accele… Rocket Thrust Calculator Calculate rocket engine thrust from propellant mass flow rate, exhaust veloci… Magnetic Permeability Calculator Calculate a material's magnetic permeability from measured flux density and f… Harmonic Wave Equation Calculator Calculate the displacement of a traveling harmonic wave at a given position a… Wind Correction Angle Calculator (Aviation) Calculate the wind correction angle a pilot needs to fly a desired ground tra… Thermal Equilibrium Calculator (Calorimetry) Calculate the final equilibrium temperature when two substances at different … Manometer Pressure Calculator Calculate the pressure difference measured by a manometer from its fluid colu… Flat vs. Round Earth Curvature Calculator Calculate how much the Earth's surface curves away over a given distance, and… Length Contraction Calculator Calculate the relativistic length contraction of an object moving at a signif… Thin Lens Equation Calculator Calculate a lens's focal length from object and image distances using the thi… Sled Ride Distance Calculator Calculate how far a sled travels on flat ground after sliding down a hill, ac… Joule Heating (I²R) Calculator Calculate the power dissipated as heat, and total heat energy generated, in a… Cycling Breakaway Gap Calculator Calculate whether a cycling breakaway will survive to the finish, from the sp… Car Crash Impact Force Calculator Estimate the average force experienced in a collision from vehicle mass, impa… Drag Equation Calculator Calculate aerodynamic drag force from fluid density, velocity, drag coefficie… Ballistic Coefficient Calculator Calculate a bullet's ballistic coefficient from its mass, diameter and form f… Bug-Rivet Paradox Calculator Explore the bug-rivet paradox in special relativity, calculating length contr… Phase Shift Calculator (Sinusoidal Function) Calculate the horizontal phase shift of a sinusoidal function y = A sin(Bx + … Index of Refraction Calculator Calculate a material's index of refraction from the speed of light within tha… Angular Resolution Calculator Calculate the diffraction-limited angular resolution of an optical instrument… Young's Modulus Calculator Calculate Young's Modulus — a material's stiffness — from applied stress and … Electric Potential Calculator (Point Charge) Calculate the electric potential at a distance from a point charge. PSIG to PSIA Converter Convert gauge pressure (PSIG) to absolute pressure (PSIA) by adding local atm… Young-Laplace Pressure Calculator Calculate the pressure difference across a curved liquid interface using the … Friction Coefficient Calculator Calculate the coefficient of friction from measured friction force and normal… Heat Capacity Calculator Calculate the heat capacity of an object — the energy needed to raise its tem… Laser Brightness (Radiance) Calculator Calculate the radiance (brightness) of a laser beam from its power, beam diam… Bernoulli Equation Calculator (Fluid Flow) Calculate pressure at a second point in a flowing fluid system using Bernoull… Hall Coefficient Calculator Calculate the Hall coefficient of a material from measured Hall voltage, samp… Beat Frequency Calculator Calculate the beat frequency produced when two sound waves of slightly differ… Stokes' Law Terminal Velocity Calculator Calculate the terminal settling velocity of a small sphere falling through a … Helium Balloon Lift Calculator Calculate how much extra weight a helium balloon can lift, based on its volum… Stefan-Boltzmann Law Calculator Calculate the total power radiated by an object using the Stefan-Boltzmann la… Curie's Law Calculator (Paramagnetism) Calculate the magnetic susceptibility of a paramagnetic material at a given t… Bulk Modulus Calculator Calculate the bulk modulus of a material — its resistance to uniform compress… Angular Displacement Calculator Calculate angular displacement under constant angular acceleration, the rotat… Shear Modulus Calculator Calculate the shear modulus — a material's resistance to shape-distorting (sh…

Chemistry

39 tools
Ideal Gas Law Calculator Solve the ideal gas law for pressure, volume, temperature or amount of substa… Molar Mass Calculator Calculate molar mass from any chemical formula, with the contribution of each… Dilution Calculator Work out how much stock solution and how much diluent a target concentration … pH Calculator Convert hydrogen ion concentration into pH and pOH, with the hydroxide concen… Moles Calculator Convert mass into moles and particle count using molar mass. Percent Yield Calculator Calculate the percent yield of a reaction from actual and theoretical yields. Mass Percent Calculator Calculate mass percent concentration, with the ppm equivalent. Boyle's Law Calculator Apply Boyle's law to find the pressure or volume of a gas at constant tempera… Charles's Law Calculator Apply Charles's law to find how a gas volume changes with temperature at cons… Combined Gas Law Calculator Apply the combined gas law across changes in pressure, volume and temperature. Half-Life Decay Calculator Calculate how much of a radioactive sample remains after a given time. Isoelectric Point Calculator Calculate the isoelectric point of an amino acid from its pKa values. Nernst Equation Calculator Calculate a cell's actual potential away from standard conditions using the N… Michaelis-Menten Equation Calculator Calculate enzyme reaction velocity from substrate concentration using the Mic… Gibbs Free Energy Calculator Calculate Gibbs free energy and determine whether a reaction is spontaneous a… Activation Energy Calculator Calculate a reaction's activation energy from rate constants measured at two … Henderson-Hasselbalch Calculator Calculate the pH of a buffer solution from pKa and the ratio of conjugate bas… Degree of Unsaturation Calculator Calculate the degree of unsaturation (index of hydrogen deficiency) from a mo… Titration Calculator Calculate an unknown concentration from a titration's equivalence point, or f… Reaction Quotient Calculator Calculate the reaction quotient Q and compare it against the equilibrium cons… Kp Calculator (Equilibrium Constant, Pressure) Convert between Kc (concentration-based) and Kp (pressure-based) equilibrium … Avogadro's Number Particle Calculator Convert an amount in moles to the actual number of particles (atoms, molecule… Ligation Calculator (Molecular Cloning) Calculate the mass of insert DNA needed for a cloning ligation reaction, give… Dipole Moment Calculator Calculate an electric dipole moment from the magnitude of separated charge an… Hydrogen Ion Concentration Calculator Calculate the hydrogen ion concentration [H+] from a solution's pH value. PPM (Parts Per Million) Calculator Calculate concentration in parts per million (ppm) from the mass of solute an… Alligation Calculator Calculate the ratio of two solutions of different concentrations needed to pr… Activity Coefficient Calculator (Debye-Hückel, dilute) Calculate an ion's activity coefficient in a dilute aqueous solution using th… Calibration Curve Calculator Calculate an unknown sample's concentration from a two-point linear calibrati… Poise to Stokes Viscosity Converter Convert between dynamic viscosity (poise) and kinematic viscosity (stokes) us… Molality Calculator Calculate molality — moles of solute per kilogram of solvent — a concentratio… Boiling Point Elevation Calculator Calculate how much a solute raises a solvent's boiling point using the boilin… TDS Calculator (Total Dissolved Solids) Estimate Total Dissolved Solids (TDS) in water from its measured electrical c… Acid-Base Neutralization Calculator Calculate the volume of base needed to completely neutralize a given amount o… Lattice Energy Calculator (Born-Landé) Calculate ionic lattice energy using the Born-Landé equation, given ionic cha… Electronegativity Difference Calculator Calculate the electronegativity difference between two elements and predict t… Q10 Temperature Coefficient Calculator Calculate the Q10 temperature coefficient — how strongly a reaction rate or b… DNA Copy Number Calculator Calculate the number of DNA molecule copies from a given mass and fragment le… Langmuir Adsorption Isotherm Calculator Calculate the amount adsorbed onto a surface using the Langmuir adsorption is…

Biology & Genetics

16 tools
Punnett Square Calculator Work out the genotype and phenotype ratios from a single-gene cross. Dihybrid Cross Calculator Calculate phenotype ratios for a two-gene cross, including the classic 9:3:3:… Hardy-Weinberg Equilibrium Calculator Calculate genotype frequencies from allele frequencies under Hardy-Weinberg e… Allele Frequency Calculator Calculate allele frequencies from observed genotype counts, with the Hardy-We… DNA Concentration Calculator Calculate nucleic acid concentration from A260 absorbance, for double-strande… Hardy-Weinberg Calculator Calculate genotype frequencies as decimals from one allele frequency. Bacterial Growth Calculator Project bacterial population growth from a doubling time. Serial Dilution Calculator Calculate the concentration remaining after a series of dilution steps. CFU Calculator Calculate colony forming units per millilitre from a plate count. PCR Primer Melting Temperature Calculator Estimate primer melting temperature with the Wallace rule, plus GC content an… Mutation Frequency Calculator Calculate mutation frequency — the proportion of a population carrying a spec… Cell Doubling Time Calculator Calculate doubling time and growth rate from two cell counts and the interval… Dilution Factor Calculator Calculate dilution factor and the cumulative dilution after any number of ser… Protein Concentration Calculator Calculate protein concentration from A280 absorbance using the Beer-Lambert l… Generation Time Calculator Calculate microbial generation time and growth rate from a population change. Molarity to Percent Calculator Convert molarity into percent weight/volume, grams per litre and the mass to …

Statistics & Probability

44 tools
T-Statistic Calculator Calculate a one-sample t-statistic from a sample mean, population mean and st… Cohen's d Calculator Calculate Cohen's d, the standardised difference between two means. Relative Risk Calculator Calculate relative risk from a 2×2 table, with the absolute difference that u… Odds Ratio Calculator Calculate an odds ratio from a 2×2 table, the standard measure for case-contr… Sensitivity and Specificity Calculator Calculate sensitivity, specificity and predictive values from a diagnostic te… Number Needed to Treat Calculator Calculate number needed to treat from event rates in two groups, with the abs… Chi-Square Statistic Calculator Calculate a chi-square statistic from observed and expected counts. Sample Proportion Calculator Calculate a sample proportion with its standard error and 95% confidence inte… Percentile Rank Calculator Calculate percentile rank using the mid-point convention for tied scores. False Positive Calculator (Bayes' Theorem) Calculate how often a positive test result is actually correct, using Bayes' … Bayes' Theorem Calculator Update a prior probability with new evidence using Bayes' theorem, and see ho… Sum of Products Calculator Calculate the sum of products (ΣXY) between two paired series of numbers. Skewness Calculator Calculate the skewness of a data set — a measure of how asymmetric its distri… Continuity Correction Calculator Apply the continuity correction when approximating a discrete binomial distri… Monty Hall Problem Calculator Calculate the win probability for switching versus staying in the Monty Hall … Bonferroni Correction Calculator Calculate the Bonferroni-corrected significance level for multiple statistica… Decile Calculator Calculate the nth decile of a data set — the value below which a given tenth … Poker Expected Value (EV) Calculator Calculate the expected value of calling a poker bet, and compare your win pro… Bertrand's Box Paradox Calculator Calculate the correct answer to Bertrand's box paradox: given a gold coin was… Simpson's Diversity Index Calculator Calculate Simpson's Diversity Index — a measure of ecological or categorical … Geometric Distribution Calculator Calculate the probability that the first success in a series of independent t… Uniform Distribution Calculator Calculate probability, mean and variance for a continuous uniform distributio… Error Function Calculator (erf) Calculate the error function erf(x), a special function central to probabilit… Elo Rating Calculator Calculate the new Elo ratings for two players after a game, using the standar… Central Limit Theorem Sample Mean Calculator Calculate the standard error of the sample mean using the Central Limit Theor… Five Number Summary Calculator Calculate the five-number summary (minimum, Q1, median, Q3, maximum) of a dat… DPMO Calculator (Six Sigma) Calculate Defects Per Million Opportunities (DPMO) — a standard Six Sigma qua… Class Width Calculator (Statistics) Calculate the class (bin) width for a frequency distribution or histogram fro… Possible Combinations Calculator Calculate the number of possible combinations (nCr) — ways to choose a sample… Upper Control Limit Calculator Calculate the upper and lower control limits for a statistical process contro… Exponential Regression Calculator Fit an exponential curve y = a·e^(bx) to a set of data points using linearize… Two Envelopes Paradox Calculator Explore the two envelopes paradox — a famous probability puzzle where a naive… EMV Calculator (Expected Monetary Value) Calculate Expected Monetary Value (EMV) — a decision-analysis technique weigh… Password Combination Calculator Calculate the total number of possible passwords for a given length and chara… Spearman's Rank Correlation Calculator Calculate Spearman's rank correlation coefficient (ρ) between two ranked data… Youden Index Calculator Calculate the Youden Index — a single summary statistic combining a diagnosti… Exponential Distribution Calculator Calculate probability and key statistics for the exponential distribution, co… Hypergeometric Distribution Calculator Calculate the probability of a specific number of successes when sampling wit… Chebyshev's Theorem Calculator Apply Chebyshev's inequality to find the minimum share of any dataset within … Relative Frequency Calculator Convert a raw count into relative frequency, percentage and odds. Margin of Error Calculator Calculate the margin of error on a survey proportion at any confidence level. Poisson Distribution Calculator Calculate Poisson probabilities for counts of events arriving at a known aver… Coin Flip Probability Calculator Calculate the probability of an exact number of heads in a run of coin flips. Binomial Distribution Calculator Calculate binomial probability for an exact number of successes, with the dis…

Electronics

48 tools
LC Resonant Frequency Calculator Calculate the resonant frequency of an LC tank circuit, with the wavelength i… Decibel Gain Calculator Convert a power or voltage ratio into decibels. kVA to Amps Calculator Convert apparent power in kVA to current, for single-phase or three-phase sys… Battery Amp Hours Calculator Convert battery energy in watt-hours to capacity in amp-hours at a given volt… Voltage Divider Output Calculator Calculate the output voltage of a resistive divider and the current it draws. PCB Trace Width Calculator Calculate the minimum PCB copper trace width for a given current using the IP… PCB Trace Resistance Calculator Calculate a PCB copper trace's resistance, voltage drop and power loss from i… Current Divider Calculator Calculate how current splits between two resistors in parallel using the curr… Inductor Energy Storage Calculator Calculate the energy stored in an inductor's magnetic field from its inductan… Voltage Regulation Calculator Calculate the percentage voltage regulation of a transformer or generator fro… NOR Gate Calculator Calculate the output of a NOR logic gate for any combination of two binary in… MOSFET Threshold Voltage Calculator Calculate a MOSFET's threshold voltage including the body effect from a non-z… Solenoid Inductance Calculator Calculate the self-inductance of an ideal solenoid from its turns, cross-sect… Dipole Antenna Length Calculator Calculate the length of a half-wave dipole antenna from its operating frequen… Forward Converter Output Calculator Calculate the output voltage of a forward converter switch-mode power supply … Propagation Delay Calculator Calculate signal propagation delay through a cable or circuit trace from its … Skin Depth Calculator Calculate the skin depth of a conductor at a given frequency — how deep alter… Cutoff Frequency Calculator (RC Filter) Calculate the cutoff (-3dB) frequency of a simple RC filter from its resistan… Flyback Converter Output Calculator Calculate the output voltage of a flyback converter switch-mode power supply … J-Pole Antenna Calculator Calculate the dimensions of a J-pole antenna from its operating frequency. Wattage to Amperage Calculator Convert power in watts to current in amps, using voltage and power factor. Intrinsic Carrier Concentration Calculator Calculate a semiconductor's intrinsic carrier concentration from its bandgap … Shockley Diode Equation Calculator Calculate diode current from forward voltage using the Shockley ideal diode e… Impedance Matching Calculator (L-Network) Calculate the reactance values for a simple L-network to match a source imped… 555 Timer Astable Frequency Calculator Calculate the output frequency and duty cycle of a 555 timer IC configured in… Junction Box Sizing Calculator (NEC) Calculate the minimum electrical junction box volume required under NEC box f… Bridge Rectifier Output Calculator Calculate the peak DC output voltage of a full-wave bridge rectifier from AC … RMS to Peak/Average Watts Converter Convert between RMS, peak and average power ratings commonly quoted for audio… Sealed Speaker Box Volume Calculator Calculate the required sealed enclosure volume for a speaker driver from its … Total Harmonic Distortion (THD) Calculator Calculate Total Harmonic Distortion (THD) from a signal's fundamental frequen… Signal Attenuation Calculator (dB) Calculate signal attenuation in decibels from input and output power levels. RLC Series Circuit Impedance Calculator Calculate the total impedance magnitude of a series RLC circuit at a given fr… Noise Figure Calculator (RF) Calculate the Noise Figure of an amplifier or receiver from its input and out… Op-Amp Gain Calculator Calculate the voltage gain of an inverting or non-inverting op-amp amplifier … Insertion Loss Calculator Calculate the insertion loss in decibels caused by adding a component into a … Modulation Index Calculator Calculate the modulation index for amplitude modulation (AM) or frequency mod… Inverting Buck-Boost Converter Calculator Calculate the output voltage of an inverting buck-boost converter from input … Resistors in Series Calculator Add resistors in series and see the current and power a supply voltage produc… Resistors in Parallel Calculator Combine resistors in parallel, with conductance and the current a supply woul… Capacitors in Series Calculator Combine capacitors in series using the reciprocal rule — the opposite of resi… Capacitors in Parallel Calculator Add capacitors in parallel, with the charge and energy stored at a given volt… Voltage Divider Calculator Calculate the output of a two-resistor divider and the current it draws. RC Time Constant Calculator Calculate the RC time constant, charge times and the filter cutoff frequency … LED Resistor Calculator Size the current-limiting resistor an LED needs, with the power rating it mus… RMS Voltage Calculator Convert between peak, peak-to-peak and RMS voltage for the common waveforms. Power Factor Calculator Calculate power factor, phase angle and the reactive power correction would h… Battery Amp Hour Calculator Calculate battery runtime from amp-hours and load, with a realistic depth-of-… Ohms to Watts Calculator Calculate power from voltage and resistance, with current and heat output alo…

Farming & Agriculture

12 tools
Corn Yield Calculator Estimate corn yield before harvest using the yield-component method. Acres Per Hour Calculator Calculate field work rate from implement width, speed and field efficiency. Cattle Per Acre Calculator Calculate how many cattle a pasture supports from forage production and grazi… Seeding Rate Calculator Calculate the seeding rate a target plant population needs, allowing for germ… Irrigation Water Calculator Calculate irrigation volume and pumping time for a given application depth. Fertilizer Nitrogen Rate Calculator Convert a nitrogen requirement into product rate and cost for any fertiliser … Hay Bale Calculator Work out how many bales a herd needs for a feeding period, with realistic was… Grain Bin Capacity Calculator Calculate grain bin capacity in bushels, including a peaked cone if the bin i… Plant Population Calculator Convert row and in-row spacing into plants per acre and per hectare. Potting Soil Calculator Calculate how much potting mix a set of containers needs, in litres and bags. Raised Bed Soil Calculator Calculate soil volume for raised beds, in litres, cubic metres and bags. Daily Light Integral Calculator Convert light intensity and photoperiod into daily light integral, the figure…

Calculators for Your Site

5 tools
Mortgage Calculator for Your Site Copy one line of HTML and put a free, responsive, tracking-free calculator on… Math Calculator for Your Site Copy one line of HTML and put a free, responsive, tracking-free calculator on… Scientific Calculator for Your Site Copy one line of HTML and put a free, responsive, tracking-free calculator on… Love Calculator for Your Site Copy one line of HTML and put a free, responsive, tracking-free calculator on… Concrete Calculator for Your Site Copy one line of HTML and put a free, responsive, tracking-free calculator on…

Unit converters

1,658 converters →

One page per conversion, each with the exact factor and a table of common values.