Rule of 72 Calculator
Calculator ToolsYears to double your money
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History
All history →Rule of 72 Calculator — at a glance
A quick way to know how long investing takes to double your money.
How to use it — step by step
The yearly return rate and how many times you want your money to grow.
Enter your numbers
Fill in the fields — sensible example values are already filled in.
Pick your options
Choose any dropdowns or switches that apply to your case.
Calculate Years
Press the button. The result is created instantly on your device.
Read the answer
The main answer is shown big at the top, with details below it.
Pro tips
Small things that make the result better.
Quick facts
Frequently Asked Questions
Why 72?+
It is a handy number that divides evenly and closely matches the exact compound interest formula.
Is it exact?+
It is an estimate. This tool also shows the exact value.
Is my data safe?+
Yes. Everything runs inside your own browser. Your text, files and images are never uploaded to any server.