# What is the rule of 69? By Nick

### Quick Peek:

Investors can use the Rule of 69 to estimate the time needed for an investment to double if they know the interest rate and if the interest is compound. To use the rule, divide 69 by the interest rate and add 0.35 to the result. However, the rule has limitations, and investors should always do their own research and consult with a financial advisor before making any investment decisions. It’s a simple calculation, but it’s not foolproof.

## The Rule of 69: A Simple Calculation to Estimate Investment Time

If you’re an investor, you know that time is money. You want to know how long it will take for your investment to double, so you can plan accordingly. That’s where the Rule of 69 comes in. It’s a simple calculation that can help you estimate the time needed for an investment to double if you know the interest rate and if the interest is compound.

### How to Use the Rule of 69

Let’s say you’re a real estate investor and you can earn twenty percent on an investment. To use the Rule of 69, you divide 69 by the 20 percent return and add 0.35 to the result. The answer is 3.65. That means it will take about 3.65 years for your investment to double.

### Why Does the Rule of 69 Work?

The Rule of 69 is based on the natural logarithm, which is a mathematical constant that has many applications in science, engineering, and finance. The natural logarithm of 2 is approximately 0.693, which is why the Rule of 69 works so well. When you divide 69 by the interest rate, you’re essentially calculating the number of times the interest rate must compound to double your investment. Adding 0.35 to the result adjusts for the fact that the Rule of 69 is an approximation and not an exact calculation.

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### Limitations of the Rule of 69

While the Rule of 69 is a useful tool for estimating investment time, it has its limitations. It assumes that the interest rate is constant and that the interest is compound. It also doesn’t take into account other factors that can affect investment performance, such as inflation, taxes, and fees. As with any investment strategy, it’s important to do your own research and consult with a financial advisor before making any decisions.

### Conclusion

In conclusion, the Rule of 69 is a simple calculation that can help investors estimate the time needed for an investment to double if they know the interest rate and if the interest is compound. While it has its limitations, it’s a useful tool for planning and decision-making. Remember to always do your own research and consult with a financial advisor before making any investment decisions.

## References for What is the Rule of 69?

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