# What is the rule of 72 & 69 used for? By Nick

### Quick Peek:

Looking to estimate the number of years it will take for your investment to double in value? You may have heard of the Rule of 72, which involves dividing 72 by the annual rate of return. However, for more accurate results with continuous compounding interest, try using 69.3 instead. While the Rule of 72 is a simple estimate, the Rule of 69 is more precise. Keep in mind that these rules are just estimates and should be used in conjunction with other factors when making investment decisions.

## What is the Rule of 72 & 69 used for?

When it comes to investing, one of the most important things to consider is the rate of return. This is the percentage of profit you make on your investment, and it’s a key factor in determining how much money you’ll have in the future. But how do you know how long it will take for your investment to double in value? This is where the Rule of 72 and 69 come in.

### The Rule of 72

The Rule of 72 is a simple formula used to estimate the number of years it will take for your investment to double in value. To use this rule, you simply divide 72 by the annual rate of return. For example, if you have an investment with a 6% annual rate of return, it will take approximately 12 years (72 divided by 6) for your investment to double in value.

While the Rule of 72 is a useful tool for estimating the time it will take for your investment to double, it’s important to note that it’s not exact. The rule assumes that your investment grows at a steady rate, which may not be the case in real life. Additionally, the rule doesn’t take into account the effects of inflation or taxes.

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### The Rule of 69

For continuous compounding interest, you’ll get more accurate results by using 69.3 instead of 72. The Rule of 72 is an estimate, and 69.3 is harder for mental math than 72, which divides easily by 2, 3, 4, 6, 8, 9, and 12. If you have a calculator, however, use 69.3 for slightly more accurate results.

Continuous compounding interest is when the interest is added to the principal amount continuously, rather than at set intervals. This means that the interest is compounded more frequently, which results in a higher overall return. The Rule of 69 is particularly useful for investments that have continuous compounding interest, such as some types of bonds and savings accounts.

### Why are these rules important?

The Rule of 72 and 69 are important tools for investors because they help to estimate the time it will take for an investment to double in value. This can be helpful when making investment decisions, as it allows you to compare different investment options and choose the one that will provide the best return in the shortest amount of time.

It’s important to note, however, that these rules are just estimates and should not be relied upon completely. Other factors, such as inflation, taxes, and market volatility, can all impact the rate of return on an investment.

## In conclusion

When it comes to investing, the Rule of 72 and 69 are useful tools for estimating the time it will take for an investment to double in value. While the Rule of 72 is a simple and easy-to-use formula, the Rule of 69 is more accurate for investments with continuous compounding interest. However, it’s important to remember that these rules are just estimates and should be used in conjunction with other factors when making investment decisions.

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