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Suppose you invest $100 at a compound interest rate of 10%. The rule of 72 tells you that your money will double every seven years, approximately: If you graph these points, you start to see the familiar compound interest curve:
DEFINITION of 'Rule Of 70'. A way to estimate the number of years it takes for a certain variable to double. The rule of 70 states that in order to estimate the number of years for a variable to double, take the number 70 and divide it by the growth rate of the variable.This rule is commonly used with an annual compound interest rate to quickly determine how long it would take to double your money.Next Up.or example, if the growth rate of the China is 10%, the rule of 70 predicts it would take 7 years (70/10) for China's real GDP to double.