The rule says that to find the number of years required to double your money at a given interest rate, you just divide the interest rate into 72.

For example, if you want to know how long it will take to double your money at eight percent interest, divide 8 into 72 and get 9 years.

## Does money double every 7 years?

The Rule of 72 states that the amount of time required to double your money equals 72 divided by your rate of return. For example: If you invest money at a 10 percent return, you will double your money every 7.2 years. If you invest at a 7 percent return, you will double your money every 10.2 years.

## How can I double my money in 5 years?

This is the number of years it will take for your money to double. For example, if your money is earning an 8 percent interest rate, you’ll double your money in 9 years (72 divided by 8 equals 9). Or, if your money is earning a 5 percent interest rate, you’ll double it in 14.4 years (72 divided by 5 equals 14.4).

## How long does it take for 401k to double?

For example, if you invest $10,000 at 10 percent compound interest, then the “Rule of 72” states that in 7.2 years you will have $20,000. You divide 72 by 10 percent to get the time it takes for your money to double. The “Rule of 72” is a rule of thumb that gives approximate results.

## How can I double my money in a year?

If you divide your expected annual rate of return into 72, you can find out how many years it will take you to double your money. Let’s say, for example, that you expect to get returns of 10 percent a year. Divide 10 into 72, and you discover the number of years it takes you to double your money, which is seven years.