Investing
Rule of 72 Calculator
The Rule of 72 is a quick mental shortcut used to estimate how long it may take an investment to double at a given annual return. This calculator performs that shortcut instantly.
Estimated doubling time
Enter your values and press Calculate.
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Frequently asked questions
Is the Rule of 72 exact?
No. It is a useful approximation.
Can I use it for debt interest too?
Yes. It can also illustrate how quickly debt can grow at higher interest rates.