Free Rule of 72 Calculator
Quick estimate of years to double your money.
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Result
Years to double (Rule of 72)
10.3 years
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Short answer
Quick estimate of years to double your money.
What is the Rule of 72 Calculator?
Quick estimate of years to double your money.
How does the Rule of 72 Calculator work?
Enter the inputs above and read the result.
Formula
Variables
RateAnnual growth or interest rate
Explanation
The Rule of 72 is a mental-math approximation of the true logarithmic doubling time.
Examples
Applications
Advantages
Limitations
Common mistakes
Tips
Related concepts
The Rule of 72 Calculator sits inside the Finance Calculators hub, in the investing & retirement cluster. Growing capital and planning for withdrawal. Understanding the terms below makes the output easier to interpret and easier to compare against neighbouring measures.
Practical use cases and industry applications
Understanding Rule of 72
Quick estimate of years to double your money. Within finance calculators, rule of 72 belongs to the investing & retirement cluster, where it shares terminology and assumptions with closely related tools.
Learning how rule of 72 is calculated
The Rule of 72 is a mental-math approximation of the true logarithmic doubling time. Working through the variables one at a time — Rate — makes the result reproducible by hand and easier to sanity-check.
Using rule of 72 to make a decision
Because outputs depend on the assumptions you enter, run more than one scenario before committing to a figure.
How rule of 72 compares with related measures
compound growth, asset allocation, withdrawal rate, yield all describe adjacent aspects of investing & retirement. Comparing this calculator's output against those measures — using the related tools listed on this page — prevents a single metric from being read in isolation.
Frequently asked questions
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