Rule of 72 Calculator
Estimate investment doubling time
%
Formula
Years ≈ 72 / Rate
Quick approximation for investment doubling time.
Examples
8% return
~9 years to double.
Frequently Asked Questions
About Rule of 72
Estimate how long it takes for an investment to double.
Related Calculators
Mortgage Calculator
Calculate monthly mortgage payments, interest, and amortization
Use calculator
Compound Interest Calculator
See how your money grows with compound interest over time
Use calculator
Loan Calculator
Calculate loan payments, interest costs, and payoff timelines
Use calculator
Salary Calculator
Convert between hourly, monthly, and annual salary
Use calculator