Rule of 72 Calculator
Calculator ToolsYears to double your money
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All history →Rule of 72 Calculator — at a glance
A quick way to know how long investing takes to double your money.
8% per year
Double (2x)
Calculate Years
About 9 years
How to use it — step by step
The yearly return rate and how many times you want your money to grow.
1
Enter your numbers
Fill in the fields — sensible example values are already filled in.
2
Pick your options
Choose any dropdowns or switches that apply to your case.
3
Calculate Years
Press the button. The result is created instantly on your device.
4
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.
✦72 ÷ rate gives a fast mental estimate.
✦At 12% your money doubles in about 6 years.
✦Inflation works the same way — at 6% prices double in 12 years.
Quick facts
Freeno signup, no limit
Instantresult in a moment
Privatenothing is uploaded
Any devicephone, tablet or PC
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.
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