Rule of 72 Calculator

Quickly estimate how long it takes to double your investment with our Rule of 72 Calculator. Just input your interest rate or years.

Rule of 72 Calculator


Result How long it will take to double your money. 0% Interest Rate: 0 years 0 years: $0
More Calculators: Compounding Interest, Stock Average, Return on Investment (ROI), Savings

Rule of 72 Formula

Now, there are two ways to calculate it based on if you want interest or years as a result.

Interest Rate

Years to Double = 72 / Interest Rate


Interest Rate = 72 / Years to Double

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