# Rule of 72

*Saving & Investing — Finicade finance glossary*

A mental-math shortcut: divide 72 by an annual growth rate to get the rough number of years for money to double. At 8% a year, that's about nine years — a quick feel for the power (and patience) of compounding.

**Also known as:** rule of seventy-two

**Related terms:** [Compound Interest](https://finicade.com/glossary/compound-interest), [Compound Interest](https://finicade.com/glossary/compound-interest), [Exponential Growth](https://finicade.com/glossary/exponential-growth)

**Taught in:** Money Basics — Interest: Money That Makes Money

Source: https://finicade.com/glossary/rule-of-72