Rule of 72 Equations Formulas Calculator

Finance - Compound Interest Investing

The Rule of 72 estimates the number of years required to double the amount of money invested. It assumes the principal is compounded annually. Note, accurate for interest rates below twenty percent.

Solving for annual interest rate.
annual interest rate

Inputs:

years to double investment (y)


Solution:

annual interest rate (i)
= NOT CALCULATED

Other Units:


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years to double investmentyears to double investment
annual interest rateannual interest rate

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