# What is rule of 69 and 70?

By Nick

### Quick Peek:

Want to know how long it will take for your investment to double? The Rule of 70 and Rule of 69 can help. These formulas calculate the time it takes for an investment to double based on the interest rate and type of compounding used. The Rule of 70 is used for compounding interest, while the Rule of 69 is used for continuous compounding. While not exact, they can help investors understand the impact of compounding on their investments. It’s crucial to understand how interest is calculated before making any investment decisions.

## What is Rule of 69 and 70?

When it comes to financial products, interest rates play a crucial role in determining the returns on your investment. However, the way interest is calculated can vary depending on the type of compounding used. In this article, we will discuss the Rule of 69 and 70, which are used to calculate the time it takes for an investment to double, based on the interest rate and the type of compounding used.

### Rule of 70

The Rule of 70 is a simple formula used to calculate the time it takes for an investment to double, based on the interest rate and the type of compounding used. This rule is used when the interest rate for the financial product is of a compounding nature, not of continuous compounding.

The formula for the Rule of 70 is:

Years to Double = 70 / Interest Rate

For example, if the interest rate is 7%, it will take approximately 10 years for your investment to double. This calculation is based on the assumption that the interest rate is compounded annually.

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It is important to note that the Rule of 70 is not an exact calculation, but rather an approximation. The actual time it takes for an investment to double may vary slightly depending on the compounding frequency and other factors.

### Rule of 69

The Rule of 69 is similar to the Rule of 70, but it is used when the interest rate is given in continuous compounding. Continuous compounding is a method of calculating interest where the interest is added to the principal amount an infinite number of times per year.

The formula for the Rule of 69 is:

Years to Double = 69 / Interest Rate

For example, if the interest rate is 7%, it will take approximately 9.9 years for your investment to double using continuous compounding.

It is important to note that continuous compounding is a theoretical concept and is not used in most financial products. However, it is used in some advanced financial models and can be a useful tool for understanding the impact of compounding on your investments.

## In conclusion

The Rule of 70 and 69 are simple formulas used to calculate the time it takes for an investment to double based on the interest rate and the type of compounding used. While these formulas are not exact, they can be a useful tool for understanding the impact of compounding on your investments.

It is important to remember that the type of compounding used can have a significant impact on your returns, and it is important to understand how interest is calculated before making any investment decisions. As always, it is recommended to seek the advice of a financial professional before making any investment decisions.

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