Want to find out how long it might take to double your money? This fun calculator uses a handy mathematical rule called the Rule of 72 that estimates approximately how many years it will take for an amount of money to double in value at a specified rate of return. To get the result, the calculator divides 72 by the rate of return. The same rule can be used to project how long before a given item will double in price at an estimated rate of inflation.

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