Financial Calculators

Interest Calculator

See how much interest a balance earns over time with any compounding frequency, with or without regular deposits.

$
%
$
Ending balance
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The formula

A = P(1 + r/n)^(nt) + PMT·[((1 + r/n)^(nt) − 1)/(r/n)]

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 Interest Calculator

  1. Fill in each field with your own figures — the defaults are only there as an example.
  2. The result updates as you type, so there is no button to press.
  3. Check the breakdown under the main result for the supporting numbers.
  4. Use the copy button to take the result with you, or share the link to reload the same inputs.

Interest Calculator — frequently asked questions

What is the difference between simple and compound interest?

Simple interest is paid only on the original principal. Compound interest is paid on principal plus previously earned interest, which is why balances curve upward instead of rising in a straight line.

Is this 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.

What people search for

This page answers each of these searches. They are the exact phrases visitors use to find the interest calculator.

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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 13, 2026 · Calculation runs client-side · No data collected · Report an error