## Rule of 72

The **rule of 72** is a popular formula used to roughly estimate how long it will
take for your investments to **double** in time assuming a constant **rate of return**.

The formula is extremely simple! Just take the number **72** and divide it by the
**interest rate** that you hope to earn from your **investments**.

We'll now ask you a few questions about your personal finances to show you that, even with modest initial savings, you can build a significant amount of wealth.

## Do you have any investments?

## Doubling Time

With the expected annual return rate, the **rule of 72** lets you estimate that your
investments will double every **72 Ã· {{ Number(this.investments_rate).toFixed(2) }} = **
**{{ Formatter.years(72 / Number(this.investments_rate)) }} years**.

Now let's watch what happens when we take advantage of compounding interest...