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Compound interest calculator

Estimate growth from a starting amount, annual rate and compounding frequency.

Free. No account needed.

Optional equipment

An optional suggestion for your wider workspace: a security key can be used with online accounts that support it. This tool does not require one.

You do not need to buy anything to use this free tool.

As an Amazon Associate I earn from qualifying purchases.

Inputs are processed on your device. Check results before using them.

Formula, method and rounding

A = P(1 + r/n)^(nt)

r is the entered nominal annual percentage divided by 100; n is compounds per year. Fixed rate; no contributions, fees, taxes or inflation.

Currency follows the rule above; other numeric results display up to 12 significant digits. Inputs are limited by JavaScript number precision. Verify results before critical use.

Result

Enter your values. Your result will appear here.

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How it works

  1. Enter the starting amount, annual percentage rate and number of years.
  2. Choose the compounding frequency per year; 12 means monthly compounding of the entered nominal annual rate.
  3. Calculate and compare final amount with growth. The estimate assumes no later deposits, fees, taxes or inflation.

Example & practical use

1,000 at 5%, compounded annually for 10 years, becomes about 1,628.89.

Limits and help

Illustration only, not investment advice. Assumes a fixed rate, no deposits, fees, taxes or inflation; returns are not guaranteed.

Your files are yours.

Image and text processing happens in your browser. Your files are not uploaded to our servers.

Troubleshooting

Check the unit for each field. Use a decimal point without thousands separators in numeric fields. A blank value is not the same as zero. Verify important results independently.

Report an issue and track its status · Contact · Contact

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