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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:
The rule of 72 is a simplified way to calculate how long an investment takes to double, given a fixed annual rate of interest. You divide 72 by the annual rate of return you receive on your investments, and that number is a rough estimate of years it takes to double your money.For example, $1 invested at 10% takes 7.2 years (72 divided by 10) to turn into $2.Now, apply this formula to Warren Buffett's number.ou divide 72 by the annual rate of return you receive on your investments, and that number is a rough estimate of years it takes to double your money. For example, $1 invested at 10% takes 7.2 years (72 divided by 10) to turn into $2. Now, apply this formula to Warren Buffett's number.