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Compound interest calculator

Project a balance with recurring contributions and inflation, or convert between compounding frequencies.

Get started

  1. Use the example values or enter your own measurements.
  2. Calculate, then copy the result or download the available details.

Example

Input

10,000 at 5% annually for 10 years

Expected result

16,288.95

Try it

Good to know

The calculation runs in your browser. Use consistent units in fields with no explicit unit.

Calculation method

Effective annual growth is (1+r/m)^m−1, or exp(r)−1 with continuous compounding. Contributions earn interest from the selected beginning or end of each period.

A=P(1+r/m)mt,APY=(1+r/m)m−1A=P(1+r/m)^{mt},\qquad \mathrm{APY}=(1+r/m)^m-1

Calculation mode

Future balance
  • Principal
  • Annual rate · %
  • Years
  • Compounding
  • Periodic contribution
  • Contribution frequency · Yearly / Semiannual / Quarterly / Monthly / Twice a month / Biweekly / Weekly / Daily
  • Contribute at start of period
  • Annual inflation · %
Equivalent interest rate
  • Annual rate · %
  • Original compounding
  • Target compounding