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 years to double investment.
years to double investment

Inputs:

annual interest rate (i)

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Solution:

years to double investment (y)
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years to double investmentyears to double investment
annual interest rateannual interest rate

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