Use the Rule of 72 to estimate how long it will take for an investment to double in value.
Rule of 72 Calculator
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How to Use This Calculator
Simply enter your expected annual interest rate.
Frequently Asked Questions
How accurate is the Rule of 72?
It is a highly accurate rule of thumb for interest rates between 6% and 10%, though it becomes slightly less accurate for very high rates.
How does the Rule of 72 Calculator work?
The Rule of 72 Calculator divides the number 72 by your expected interest rate to instantly estimate how many years it will take your money to double.
Is the Rule of 72 Calculator accurate?
The Rule of 72 Calculator is remarkably accurate for interest rates between 5% and 12%, making it a favorite quick-math tool for investors.
Does the Rule of 72 Calculator apply to inflation?
Yes! You can enter an inflation rate into the Rule of 72 Calculator to see how long it will take for your purchasing power to be cut in half.
Why use the Rule of 72 Calculator instead of a complex one?
The Rule of 72 Calculator is perfect for rapid mental math and quick portfolio projections without needing detailed spreadsheet inputs.