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Compound Interest Calculator

See how savings grow with compound interest and monthly contributions, year by year.

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How to use the Compound Interest Calculator

  1. 1

    Enter the initial investment, annual interest rate and number of years.

  2. 2

    Choose how often interest compounds and add an optional monthly contribution.

  3. 3

    Review the future value, the growth table and download it as a CSV file.

Frequently asked questions

What formula is used?

Without contributions the future value is P × (1 + r/n)^(n × t). Monthly contributions are added at the end of each month and earn interest at the same effective rate.

Does compounding frequency matter?

Yes. The more often interest compounds, the more you earn, although the difference between monthly and daily compounding is small.

Is this financial advice?

Results are estimates for planning only and are not financial advice.