TopToolAIRule of 72 Calculator
A quick mental-math shortcut for compound interest: divide 72 by the annual rate to estimate how many years it takes an investment to double, or divide 72 by the years to find the rate you would need.
How to use Rule of 72 Calculator
Step-by-step guide to the boxes below. Open it only if you need help.
How to use Rule of 72 Calculator
Step-by-step guide to the boxes below. Open it only if you need help.
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1
Annual interest rate % Text
Yearly return in percent, e.g. 8. Fill this to find how many years your money takes to double.
Example: 8
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2
Years to double Text
Fill this instead to find the yearly rate you need to double your money in that many years.
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3
Press “Calculate”
Click the button under the boxes. If something is missing or not valid, a short message tells you which box to fix.
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4
Read your result
Your answer appears under the button, with a short note in plain words where it helps. Change any box and press again to compare different numbers.
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