Rule of 72 and Rule of 70 are used to **estimate** the length of time required to double an investment given the annual rate of return.
These rules are very similar to each other, and are widely used by both beginners and financial experts.

Using **Rule of 72**, if I put money in a bank account that yields **{{pc.InterestRate != null ? pc.InterestRate : 0}}%** a year, I will double my invested money in about

{{pc.DoublingTime72}} year{{pc.DoublingTime72 == 1 ? '' : 's'}}

Using **Rule of 70**, if I put money in a bank account that yields **{{pc.InterestRate != null ? pc.InterestRate : 0}}%** a year, I will double my invested money in about

{{pc.DoublingTime70}} year{{pc.DoublingTime70 == 1 ? '' : 's'}}

This calculator can show you the differences between Rule of 72 and Rule of 72, and apply these rules to find the time required to double your invested money.

By **An Do**

Published **November 19, 2017**

Category **Investment**