# Is Rule of 72 always correct? By Nick

### Quick Peek:

Looking to estimate how long it will take for your investments to double in value? Enter the Rule of 72, a formula that divides 72 by the expected interest rate to give you the number of years it will take for your investment to double. While useful, it’s important to remember that the rule is an approximation and not always accurate. The most precise results come from an 8% interest rate, and the farther you stray from that rate, the less precise your estimate will be.

## The Rule of 72: A Quick and Easy Way to Estimate Investment Returns

Investing can be a tricky business, and it can be hard to know whether you’re making the right decisions. That’s why many people turn to the Rule of 72, a simple formula that can help you estimate how long it will take for your investments to double in value. But is the Rule of 72 always correct? Let’s take a closer look.

### What is the Rule of 72?

The Rule of 72 is a quick and easy way to estimate how long it will take for your investments to double in value. To use the Rule of 72, you simply divide the number 72 by the interest rate you expect to earn on your investment. The result is the number of years it will take for your investment to double in value.

For example, if you expect to earn a 10% return on your investment, it will take approximately 7.2 years for your investment to double in value (72 divided by 10 equals 7.2). Similarly, if you expect to earn a 6% return, it will take approximately 12 years for your investment to double in value (72 divided by 6 equals 12).

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### Is the Rule of 72 Always Correct?

While the Rule of 72 is a handy tool for estimating investment returns, it is important to remember that it is an approximation and therefore not perfectly accurate. The most accurate results from the Rule of 72 are based on an 8% interest rate, and the farther from 8% you go in either direction, the less precise the results will be.

For example, if you use the Rule of 72 to estimate the time it will take for an investment to double in value at a 4% interest rate, the result will be 18 years (72 divided by 4 equals 18). However, the actual time it will take for the investment to double in value may be slightly longer or shorter than 18 years.

Similarly, if you use the Rule of 72 to estimate the time it will take for an investment to double in value at a 12% interest rate, the result will be 6 years (72 divided by 12 equals 6). However, the actual time it will take for the investment to double in value may be slightly longer or shorter than 6 years.

### Conclusion

In conclusion, the Rule of 72 is a useful tool for estimating investment returns, but it is not always perfectly accurate. The most accurate results are based on an 8% interest rate, and the farther from 8% you go in either direction, the less precise the results will be. When using the Rule of 72, it is important to remember that it is an approximation and that actual investment returns may vary.

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## References for « Is Rule of 72 always correct? »

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