Rule of 72 Calculator
Result
Calculated result
14.2066990829
Based on the values entered.
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Rule of 72 Calculator — free online calculator.
Formula
Doubling years ≈ 72 / annual rate (%); Exact = ln(2) / ln(1 + r)
- Rule of 72 Calculator calculates its result from Rate (decimal). It uses the formula Doubling years ≈ 72 / annual rate (%); Exact = ln(2) / ln(1 + r). Change any input to recalculate the result instantly.
- The main inputs are Rate. Enter them in the units and format shown in the calculator.
- Use monetary amounts, rates and time periods exactly as labeled; the result reflects the assumptions entered on this page.
- Changing any input above recalculates the result with the same calculation engine used by this page.
Example: Rule of 72
Inputs
- Rate: 0.05 decimal
Using Rate (decimal) = 0.05, the calculated result is 14.2066990829.
Sample result: Calculating…
Frequently asked questions
What does the Rule of 72 calculate?
Rule of 72 Calculator — free online calculator.
Which values should I enter?
Enter Rate using the units and format shown beside each field.
What formula does this calculator use?
The calculator uses the following relationship: Doubling years ≈ 72 / annual rate (%); Exact = ln(2) / ln(1 + r).
Why might my result differ from another source?
Results can differ when another source uses different units, rounding rules, conventions or assumptions. Compare the inputs and definitions before comparing results.
Does the result update automatically?
Yes. Changing an input updates the result using the same calculation engine shown on this page.