The 'Rule of 72' tells you approximately how long it takes for money invested at a given rate of compound interest to double in value.

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The 'Rule of 72' is a quick and easy way to estimate how long it takes for money to double based on compound interest. Simply divide 72 by the interest rate (as a percentage) to get the approximate number of years it will take for the principal to double. For example, if the interest rate is 6%, it will take about 12 years (72/6=12) for the money to double.

The 'Rule of 72' Tells You Approximately How Long It