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Compound Interest Calculator

See how your money grows with compound interest. Enter your starting amount, rate and time horizon.

Initial amount($)

Annual rate(%)

Time(years)

Compounding

Results update automatically as you type.

Final balance

$16,288.95

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How this is calculated

P is the principal, r the annual rate, n the compounding periods per year, and t the number of years.

A = P × (1 + r/n)^(n·t)

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Most savings accounts compound monthly or daily. Use monthly as a sensible default.

Compute simple interest on a principal over time.

Project the future value of regular monthly deposits.

Measure return on investment and total gain.

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