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Rule of 72 calculator
How many years it takes your money to double at a given return, or the return you need to double in a set time.
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About Rule of 72 calculator
Estimates how many years it takes money to double by dividing 72 by the annual return, or the return needed to double in a set time. At 8 percent, money doubles in about 9 years. It is a mental shortcut that stays close for rates between roughly 6 and 10 percent.
How to use Rule of 72 calculator
- Enter your numbers above.
- The result updates instantly as you type.
- Change any value to compare different cases.
Why use this tool?
- Private: everything happens in your browser. Nothing you enter is uploaded.
- Free, with no sign-up, no watermark and no limit on how often you use it.
- Works on phones, tablets and computers: Android, iPhone, Windows, Mac and Linux. Nothing to install.
- Available in 10 languages.
Also known as
Frequently asked questions
Is the Rule of 72 exact?
No, it is an approximation. It works best for moderate rates, and exact results use the logarithm of 2 divided by the log of 1 plus the rate.
Is Rule of 72 calculator free?
Yes. Rule of 72 calculator on Toolipedia is free to use, with no sign-up and no watermark.
Is it safe to use?
Yes. Everything is worked out in your browser, and nothing you enter is sent to our server.
Does it work on my phone?
Yes. It works in any modern browser on Android and iPhone, as well as on tablets and computers. There's nothing to install.
Do I need an account?
No. Just open the page and use the tool. There's no sign-up and no email needed.