Rule of 72 calculator
Rule of 72 calculator
Estimate how many years it takes for money to double at a selected annual return.
Result
Approx. double time
9 years
Exact double time
9.01 years
Approx. triple time
14.25 years
Annual rate
8%
- Formula
- years to double ~= 72 / annual return percent
| Formula | years to double ~= 72 / annual return percent |
|---|
Rule of 72 investment calculator
The rule of 72 is a quick mental estimate for compound growth.
Exact results differ at very low or very high rates.
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Use the calculator to turn input values into a clear, repeatable result.
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Keep units and assumptions visible so the calculation can be checked later.
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Copy the result or key numbers for reports, messages or spreadsheets.
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Reset to defaults when you want to compare another scenario from a clean state.
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Calculators run in the browser and are useful for quick estimates before formal checks.
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For finance, health, engineering or legal decisions, verify important results with a specialist or official source.
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