Rule Of 72s Rate Estimator

This calculator requires the use of Javascript enabled and capable browsers. This script estimates by using the Rule of 72s what interest rate is required to double your investment for a given number of years. The formula is 72 / Number of Years to Double your Investment = Rate. Enter the number of years desired to double your investment as a whole number. For instance 10 is equal to 10 years but 10.5 is equal to 10 years and 6 months; it is legitmate. Click on Calculate and see the estimated rate of return required to double your investment. You may click on Clear Values and do another.

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