# Why is Rule 72 good?

By Nick

### Quick Peek:

The Rule of 72 is a useful tool for investors to estimate how long it will take for their investment to double in value based on its interest rate. The value 72 is a convenient choice of numerator as it has many small divisors, making it easy to calculate in your head. This rule provides a good approximation for annual compounding and typical rates from 6% to 10%. While it has limitations, the Rule of 72 is still a valuable tool for investors to make informed decisions about their investments and plan for their financial future.

## Why is Rule 72 Good?

When it comes to investing, there are many rules and formulas that people use to make informed decisions. One of the most popular is the Rule of 72. This rule is used to estimate how long it will take for an investment to double in value based on its interest rate. But why is Rule 72 a good choice? Let’s take a closer look.

### The Value of 72

The number 72 is a convenient choice of numerator for this formula because it has many small divisors. These divisors include 1, 2, 3, 4, 6, 8, 9, and 12. This makes it easy to calculate the rule in your head, which is especially useful when making quick investment decisions.

But the value of 72 is not just convenient, it also provides a good approximation for annual compounding and for compounding at typical rates, which range from 6% to 10%. This means that the rule is accurate enough for most investment scenarios, making it a valuable tool for investors.

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### Using the Rule of 72

Now that we know why Rule 72 is a good choice, let’s talk about how to use it. The formula is simple: divide 72 by the interest rate to get the number of years it will take for an investment to double in value.

For example, if you have an investment with an interest rate of 8%, it will take approximately 9 years for it to double in value (72 ÷ 8 = 9). This can help you make informed decisions about your investments and plan for your financial future.

### Limitations of the Rule of 72

While the Rule of 72 is a useful tool for estimating investment growth, it does have its limitations. For one, it assumes that the interest rate remains constant over time, which is not always the case. Additionally, it does not take into account factors such as taxes and inflation, which can have a significant impact on investment returns.

Despite these limitations, the Rule of 72 remains a popular and valuable tool for investors. By providing a quick and easy way to estimate investment growth, it can help you make informed decisions and plan for your financial future.

## In Conclusion

The Rule of 72 is a simple yet powerful tool for estimating investment growth. Its value of 72 makes it easy to calculate in your head, and it provides a good approximation for annual compounding and typical interest rates. While it has its limitations, it remains a popular and valuable tool for investors looking to make informed decisions about their investments and plan for their financial future.

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## References for « Why is Rule 72 good? »

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