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Compound Interest Calculator

Project savings growth with compound interest and regular contributions.

To calculate compound interest, enter your starting amount, any regular monthly contribution, the expected annual return and the number of years. The projection separates what you put in from what the interest earned, and shows the effective annual rate after compounding.

Runs in your browser
Privacy
Runs entirely in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

What is the rule of 72?

A shortcut for doubling time: divide 72 by the annual percentage return. At 7% a year, money roughly doubles every ten years. It is an approximation but accurate enough for mental arithmetic between about 4% and 12%.

How to use the compound interest calculator

  1. 1Set the initial amount.
  2. 2Set the added each month.
  3. 3Set the annual return.
  4. 4Set the years.
  5. 5Choose the compounding.
  6. 6The result appears immediately — copy or download it.

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Put the working compound interest calculator on your own site. It runs in your visitors' browsers exactly as it does here — free, no account, nothing uploaded.

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