The Rule of 70

WORLD GDP is growing at 4% per year, how long will it take for world GDP to double?

Your company’s revenue is growing at 10% per month, how long will it take for your company’s revenue to double?

There is a simple rule of thumb that you can use to figure out roughly how long it will take for something to double, given an expected growth rate.

The Rule of 70

This rule of 70 can be described by the following equation:

If the world’s GDP is growing at 4% per year then global GDP will double in about 17 years.

If your company’s revenue is growing at 10% per month then revenues will double in about 7 months.