Energy, Power & Torque
Engineering converters: amps to watts for DC and both AC configurations, lumens to watts by bulb technology, kilojoules to calories, torque between newton-metres and foot-pounds, and frequency to period.
Inch-Pounds to Foot-Pounds Converter
Convert torque between inch-pounds, foot-pounds and newton-metres — the conve…
Newton-Meters to Foot-Pounds Converter
Convert newton-metres to foot-pounds and inch-pounds, the conversion between …
Bend Allowance Calculator
Calculate the bend allowance for a sheet metal bend, for accurate flat-patter…
BMEP Calculator (Brake Mean Effective Pressure)
Calculate Brake Mean Effective Pressure — a normalised measure of an engine's…
Simply Supported Beam Load Calculator
Calculate reaction forces, bending moment and deflection for a simply support…
Mixed Air Temperature Calculator
Calculate the resulting temperature when outdoor air mixes with return air in…
Principal Stress Calculator (2D)
Calculate the principal stresses and maximum shear stress from a 2D stress st…
Nusselt Number Calculator
Calculate the Nusselt number — a dimensionless ratio comparing convective to …
Torsion Spring Calculator
Calculate the torque produced by a torsion spring from its spring rate and an…
Involute Function Calculator (Gear Design)
Calculate the involute function value used in gear tooth geometry from a give…
Coefficient of Performance Calculator
Calculate the Coefficient of Performance for a refrigerator, air conditioner …
Shear Stress Calculator
Calculate direct (average) shear stress from an applied force and the cross-s…
Vickers Hardness Number Calculator
Calculate the Vickers Hardness Number from an indentation test's applied forc…
Section Modulus Calculator (Rectangular Beam)
Calculate the section modulus of a rectangular beam, and the maximum bending …
Metric Thread Dimensions Calculator
Calculate the pitch and minor diameters of a metric bolt thread from its nomi…
Belt Length Calculator (Pulleys)
Calculate the length of a belt connecting two pulleys of different radii, fro…
Thermal Stress Calculator
Calculate the internal stress that develops when a material's thermal expansi…
True Position Calculator (GD&T)
Calculate the actual positional error (as a diameter) of a manufactured featu…
SCFM to ACFM Calculator
Convert gas flow rate from standard conditions (SCFM) to actual conditions (A…
Brinell Hardness Number Calculator
Calculate the Brinell Hardness Number (BHN/HB) from applied load, ball diamet…
Oblique Shock Angle Calculator
Estimate the oblique shock wave angle from upstream Mach number and flow defl…
NPSH Calculator (Net Positive Suction Head)
Calculate Net Positive Suction Head Available (NPSHa) for a pump system, to c…
Hydraulic Conductivity Calculator (Darcy's Law)
Calculate hydraulic conductivity — a soil or rock's permeability — from Darcy…
Vertical Curve Calculator (Road Design)
Calculate the elevation at any point along a parabolic vertical curve used in…
Rotational Stiffness Calculator
Calculate rotational (torsional) stiffness from applied torque and the result…
MLVSS Calculator (Wastewater Treatment)
Calculate Mixed Liquor Volatile Suspended Solids (MLVSS) mass from concentrat…
Sensible Heat Calculator
Calculate sensible heat — the energy needed to change a substance's temperatu…
Biot Number Calculator
Calculate the Biot number to check whether the lumped capacitance method is v…
Taper Angle Calculator
Calculate the included taper angle of a machined part from its two diameters …
Clearance Hole Size Calculator
Calculate the recommended clearance hole diameter for a given bolt or screw s…
Chain Length Calculator (Sprockets)
Calculate the required chain length in links for a two-sprocket drive system.
Percent Elongation Calculator
Calculate percent elongation — a standard measure of a material's ductility —…
Simply Supported Beam Deflection Calculator
Calculate the maximum deflection of a simply supported beam under a central p…
CFM Airflow Calculator
Calculate the required airflow in CFM (cubic feet per minute) for a room base…
BSFC Calculator (Brake Specific Fuel Consumption)
Calculate Brake Specific Fuel Consumption (BSFC) — a standard measure of engi…
Newtons to Pounds-Force Converter
Convert newtons to pounds-force.
About the energy, power & torque
Engineering converters: amps to watts for DC and both AC configurations, lumens to watts by bulb technology, kilojoules to calories, torque between newton-metres and foot-pounds, and frequency to period. There are 36 converters in this category, and each one shows the formula it uses, works instantly as you type, and keeps your figures on your own device.
Grouped above by the unit you are converting from, so a category with hundreds of pairs stays scannable. Every conversion also exists in reverse — the link is on each page.
Cannot find what you need? Ask for it — requested calculators go to the front of the build queue.