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Compound Interest Calculator

See how much a starting amount grows when interest is added to the balance. You can also add a fixed amount every month.

The numbers you type stay in your browser. Nothing is uploaded.

Real bank and investment returns can differ because of tax, charges and changing rates. Treat the result as an estimate.

How to use

  1. Enter the starting amount, rate and number of years.
  2. Choose how often interest is added.
  3. Optionally add a monthly amount you will keep adding.
  4. Read the final amount and the year-by-year table.

Good to know

Real bank and investment returns can differ because of tax, charges and changing rates. Treat the result as an estimate.

Questions and answers

What is compound interest?

It is interest earned on the starting amount and also on interest that was added earlier.

Does compounding more often help?

Yes, slightly. Monthly compounding gives a little more than yearly at the same rate.

Is my data saved?

No. The numbers stay in your browser.

More tools: see all tools.