# What is the rule of 69?

By Nick

### Quick Peek:

Want to know how long it will take for your investment to double? Look no further than the Rule of 69. This formula estimates the time it takes for an investment to double, assuming continuously compounded interest. Simply divide 69 by the rate of return and add 0.35 to the result. Keep in mind that this is just an estimate and market conditions and investment type can affect the actual time it takes to double. The Rule of 69 is a simplified version of the complex formula used to calculate compound interest.

## What is the Rule of 69?

If you’re an investor or someone who’s interested in investing, you may have heard of the Rule of 69. It’s a simple formula used to estimate the amount of time it will take for an investment to double, assuming continuously compounded interest. The calculation involves dividing 69 by the rate of return for an investment and then adding 0.35 to the result.

### How to Use the Rule of 69

To use the Rule of 69, you first need to know the rate of return for your investment. Let’s say you have an investment that earns a rate of return of 8% per year. To estimate how long it will take for your investment to double, you would divide 69 by 8, which equals 8.625. Then, you would add 0.35 to that result, giving you an estimated time of 8.975 years for your investment to double.

It’s important to note that the Rule of 69 is an estimate, and the actual time it takes for an investment to double can vary depending on a variety of factors, including market conditions and the type of investment. However, the Rule of 69 can be a useful tool for investors who want to quickly estimate the potential growth of their investments.

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### Why 69?

You may be wondering why the number 69 is used in the Rule of 69. The reason is that 69 is a logarithmic approximation of the natural logarithm of 2, which is the mathematical constant used to calculate compound interest. The Rule of 69 is a simplified version of the more complex formula used to calculate compound interest, and it’s a quick and easy way to estimate investment growth.

### Conclusion

In conclusion, the Rule of 69 is a simple formula used to estimate the amount of time it will take for an investment to double, assuming continuously compounded interest. To use the Rule of 69, you need to know the rate of return for your investment, and then you can quickly estimate how long it will take for your investment to double. While the Rule of 69 is not a precise calculation, it can be a useful tool for investors who want to quickly estimate the potential growth of their investments.

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