# Rule of 70

From SubSurfWiki

A quantity growing at *n*% per period doubles in size roughly every 70/*n* periods. For example, 10% growth per year means a doubling in ~7 yr.

## External links

- Rule of 72 — Wikipedia page

From SubSurfWiki

A quantity growing at *n*% per period doubles in size roughly every 70/*n* periods. For example, 10% growth per year means a doubling in ~7 yr.

- Rule of 72 — Wikipedia page