Rule of 72 Calculator
Estimate how long money takes to double at a given annual rate.
Inputs
Expected yearly return, e.g. 8
$
The sum you are investing or borrowing
Results
Years to double
9
≈ 9 years to double your money
Doubled amount
$20,000.00
at this rate
About this tool
Enter an annual interest rate to see how many years money takes to double using the rule of 72. A quick shortcut for investments and loans.
How to use
- 1Enter the annual interest rate as a percentage.
- 2Optionally enter an amount to see the doubled figure.
- 3Read the years to double and the doubled amount.
Frequently asked questions
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