Compound Interest Calculator

How your money grows with compound interest and regular deposits.

Runs in your browser. Nothing you enter is sent or stored.

How to use Compound Interest Calculator

  1. Enter your starting amount, interest rate and number of years.
  2. Add a regular monthly contribution if you have one, and choose how often interest compounds.
  3. See the final balance, total interest and a year-by-year table.

Frequently asked questions

Is this investment advice?

No. It's arithmetic: it assumes a fixed rate every year, which real investments don't deliver. Use it to understand how compounding works, not to predict returns.

When are contributions added?

At the end of each month, and they start earning interest from then.

Is Compound Interest Calculator free?

Yes. Compound Interest Calculator is free to use with no sign-up and no watermark.

Is my information saved or sent anywhere?

No. Everything is calculated in your browser. Nothing you enter is sent to a server or stored.

Does it work on my phone?

Yes. It works in any modern browser on Windows, Mac, Linux, Android and iPhone. Very large files may be slow on older phones.

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