Rule of 72 Calculator
Estimate how many years it takes money to double at a given annual return. Divide 72 by the rate for a quick mental estimate that is close for…
8 of 8 free uses remaining today
Estimate how many years it takes money to double at a given annual return. Divide 72 by the rate for a quick mental estimate that is close for common rates.
General information only, not financial advice. Results are estimates; fees, tax and future rate changes may affect outcomes.
Worked example
Example calculated from the starting values. Enter your own values and press Calculate to get your result.
With the default inputs (annual return = %6), the results are: years to double 12.0.
Quick reference: annual return vs result
Reference table based on the example values; it is not your calculation result.
| Annual return (%) | Years to double |
|---|---|
| 3 | 24.0 |
| 6 | 12.0 |
| 12 | 6.0 |
| 30 | 2.4 |
| 60 | 1.2 |
| 120 | 0.6 |
Frequently asked questions
What formula does this calculator use?
Years to double = 72 ÷ r. Variables: r = annual return in %.
What do I need to enter?
You need annual return (%). Results update as you type.
What is an example result?
With the default inputs (annual return = %6), the results are: years to double 12.0.
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