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Compound interest calculator

See how savings grow with compound interest, including optional monthly deposits.

A = P(1 + r/n)^(nt). Assumes a constant rate; not financial advice.

Calculations run in your browser. Nothing you enter is sent to ToolsNest servers or stored.

How to use the Compound Interest Calculator

  1. 1Enter the starting amount and rate.
  2. 2Choose years and compounding frequency.
  3. 3Optionally add a monthly deposit.

Supported formats and limits

  • Assumes a constant rate and deposits at month end.
  • Ignores tax and inflation.

Common uses

  • Planning savings goals.
  • Comparing deposit accounts.

Frequently asked questions

Is this financial advice?

No. Real returns vary.

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