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Compound Interest Calculator

See how your investments grow exponentially over time

Calculate compound interest on your investments. See how your money grows over time with annual compounding.

How to use this tool
  • Enter the Principal amount (initial investment)
  • Enter the Rate of Interest (%) per year
  • Enter the Time in years
  • Click Calculate to see the compound interest and final amount
Privacy & Security

All calculations are performed locally in your browser. No data is ever sent to any server.

Compound Interest Formula
  • Amount = P × (1 + r/100)t
  • Compound Interest = Amount − P
  • Where P = Principal, r = Rate, t = Time (years)
What is compound interest?

Compound interest is interest calculated on the initial principal, which also includes all accumulated interest from previous periods.

What is the formula for compound interest?

Amount = P × (1 + r/100)t, CI = Amount − P

Is my financial data secure?

Yes. All calculations happen on your device. No information is transmitted or stored.

Is this tool free?

Yes – completely free with no registration, limits, or watermarks.

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