Compound Interest Calculator
Enter your starting amount, monthly contribution, annual return and number of years to see the future value of your investment.
Calculator
Future value
$300,850.72
Total contributions
$130,000.00
Interest earned
$170,850.72
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Formula
FV = P(1+r)^n + PMT × ((1+r)^n − 1)/r — Excel: =FV(rate/12, years*12, -pmt, -p)Frequently Asked Questions
What is compound interest?
Interest earned on both your original money and on the interest already added — growth on growth.
What is the rule of 72?
Divide 72 by the annual return to estimate how many years it takes to double your money. At 8%, about 9 years.