Rule of 72 Calculator
Estimate how many years it takes to double money, or required return to double in a target period.
Result
Rule of 72 Formula
Years to Double ≈ 72 / Annual Return%
Required Return% ≈ 72 / Years
Rule of 72 Example Calculation
At 8% annual return, doubling time ≈ 72/8 = 9 years.
Frequently Asked Questions about Rule of 72
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