Rule of 72 Calculator
Rule of 72: years to double = 72 ÷ annual rate. Quick compound growth estimate.
Use the Rule of 72 Calculator
Enter annual rate. Years to double your money (Rule of 72) is calculated.
Input
Annual growth rate.
Results
Years to double
10.3
Rule of 72: 72 ÷ rate ≈ years to double. Rule of 69.3 is more accurate for continuous compounding.
How this calculator works
Enter annual growth rate. Years to double = 72 ÷ rate.
How to interpret your results
At 7%, money doubles in ~10 years. At 10%, ~7 years.
FAQs
What is the Rule of 72?▾
72 ÷ annual rate ≈ years to double your money. Quick mental estimate for compound growth.
Is it accurate?▾
Approximate. Rule of 69.3 is more accurate for continuous compounding. Works well for 6–10%.
When to use?▾
Quick estimates for investments, inflation, or savings growth.
Related tools
Browse all calculators on NetGrow.