Rule of 72 Calculator
Years to double your money at a given interest rate.
Result
Years to double
12years
Common questions
What is the Rule of 72?
Divide 72 by the annual interest rate to estimate how many years it takes to double your money. At 8% return, money doubles in about 72 ÷ 8 = 9 years.
How accurate is the Rule of 72?
It is a close approximation for rates between 2% and 15%. For very high or very low rates, the Rule of 69.3 or exact compound interest formulas are more precise.