Compound Interest Calculator

See the power of compound interest - watch your money grow over time!

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$
Future Value
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Total Contributions
$0
Total Interest
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The Compound Interest Formula

A = P(1 + r/n)^(nt) + PMT × [((1 + r/n)^(nt) - 1) / (r/n)]
A = Future value
P = Principal (initial investment)
r = Annual interest rate (decimal)
n = Compounds per year
t = Time in years
PMT = Monthly payment

The Rule of 72

To estimate how long it takes to double your money, divide 72 by your interest rate. At 7% interest, your money doubles in about 10.3 years!

Principal + Contributions
Interest Earned

Compare Compound Frequencies

Annual

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Monthly

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Daily

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Year-by-Year Breakdown

Year Contributions Interest Balance