Rule of 72 Calculator
Find how long it takes to double your money at any interest rate using the Rule of 72.
Part of our Finance Calculators collection.
Rule of 72 Calculator
Free online calculator
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How to Use This Calculator
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How This is Calculated
Doubling Time = 72 / Annual Rate Extended: 72 can be used for any doubling problem Time to triple ≈ 114 / Rate
Example Calculation
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Frequently Asked Questions
How accurate are these projections?
Investment projections assume a constant return rate which never occurs in practice. Use these as planning guides, not guarantees.
Should I consult a financial advisor?
For retirement planning, a fee-only fiduciary financial advisor can provide personalised guidance accounting for your full financial picture.