Compound Interest: The Formula, the Intuition and the Traps
Why balances curve upward instead of rising in a straight line, what compounding frequency actually changes, and the sh…
Compound Interest Calculator
Watch compounding work: the balance, the interest earned, and how much difference the compounding frequency actually makes.
Every figure below is labelled in the currency you pick. Amounts are not converted — enter values in the same currency.
$
%
$
Final balance
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The formula
A = P(1 + r/n)^(nt)
Every result on this page comes from this formula. Nothing is rounded until the final display, so figures match a spreadsheet to the cent.
How to use the Compound Interest Calculator
- Fill in each field with your own figures — the defaults are only there as an example.
- The result updates as you type, so there is no button to press.
- Check the breakdown under the main result for the supporting numbers.
- Use the copy button to take the result with you, or share the link to reload the same inputs.
Compound Interest Calculator — frequently asked questions
Is this compound interest calculator free to use?
Yes. Every calculator on the site is free, needs no sign-up, and runs entirely in your browser, so your figures never leave your device.
How accurate is the result?
The maths is exact for the formula shown on the page. Accuracy in the real world depends on your inputs and on assumptions the formula cannot see, so treat the output as a well-grounded estimate rather than a quote.
Can I use it on my phone?
Yes. The page is responsive, weighs a few kilobytes and works offline once loaded, so it behaves the same on a phone as on a desktop.
Related reading
Focused versions of this calculator
Each of these does one specific job with its own defaults and explanation.
- Daily Compound Interest Calculator Compound interest calculated daily — the schedule savings accounts and most credit cards …
- Quarterly Compound Interest Calculator Interest compounded four times a year, the convention for many bonds and certificates.
What people search for
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About this calculator
Written and reviewed by The Samsung Calculator editorial team. Every calculator is written against a published formula, reviewed against at least one independent reference implementation, and dated when it changes.
Last reviewed August 15, 2026 · Calculation runs client-side · No data collected · Report an error