Rule of 72 Calculator
Time to Double
%
$
Rate Needed to Double
Formula
Years to double ≈ 72 / Rate%
Frequently Asked Questions
What is the Rule of 72?
The Rule of 72 is a quick way to estimate how long it takes to double your money: Years = 72 / Interest Rate. At 8% return, money doubles in ~9 years. At 6%, ~12 years. It's most accurate for rates between 6-10%.
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