Investing
Rule of 72
When will your money double?
Quickly estimate how many years it takes an investment to double or triple using the Rule of 72 and Rule of 115.
Growth Rate
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How It Works
The Formula
Years to double = 72 ÷ r
r = annual rate as a percentage
Worked Example
8% annual return
- 1Years = 72 ÷ 8
- 2Years = 9
Result: ≈ 9 years to double
Pro Tip
Rule of 115 estimates tripling time: 115 ÷ rate.
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