Rule of 72 Calculator is a quick and easy way to calculate how long it will take you to double your investment.

- Rule Of 72 Estimate:
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- Exact Answer:
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- What does Rule of 72 mean?
- The rule of 72 is applied to compounded interest annually. It determines the number of years an investment will take to double itself. At an annual rate of interest (fixed) by dividing 72 by the annual rate of return.

- Formula
- 72 / Interest Rate = Years

- Example
- If you invested $200 at 6% interest, it will take you about 72/6 = â€˜12â€™ years to double your investment to $400.