Rule of 72 Calculator
How many years until your money doubles? Use the classic Rule of 72 and the exact math.
Result
What is the Rule of 72 Calculator?
The Rule of 72 is the fastest mental shortcut in personal finance: divide 72 by your annual rate to estimate the number of years needed to double your money. This tool does that instantly, and also shows the exact doubling time using logarithms, plus the Rule of 114 for tripling and Rule of 144 for quadrupling.
A table for rates from 1% to 12% shows how big an effect even 2–3 percentage points have on growth.
How to use the Rule of 72 Calculator
- Enter your content in the input box above.
- Adjust any extra options if needed.
- Click Run Tool and your result appears instantly.
- Copy or download the output — it never leaves your device.
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