Compound Interest Calculator
See how a starting balance and regular contributions grow over time. Adjust any input and the chart updates instantly.
$
$
Historical S&P 500 avg: ~7% (inflation-adjusted)
%
1%15%
yrs
1 yr50 yrs
Final Balance
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after 20 years
Total Contributed
—
your money in
Interest Earned
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growth on top
The Rule of 72: Divide 72 by your interest rate to estimate how long it takes to double your money. At 7%, money doubles every ~10.3 years.
Read more: Index Funds for Beginners