Utility Tools
Rule of 72 Calculator
Calculate how long it takes to double your investment using the Rule of 72. Simple, fast, and effective financial calculator for investors.
Inputs
What is the Rule of 72?
The Rule of 72 estimates how many years it will take to double your investment at a fixed annual interest rate.
Formula: Years = 72 ÷ Interest Rate
The Rule of 72 estimates how many years it will take to double your investment at a fixed annual interest rate.
Formula: Years = 72 ÷ Interest Rate
Answer
Enter an amount and rate, then calculate
How to use the Rule of 72 calculator
- Enter your starting investment amount in dollars.
- Enter the expected annual interest rate as a percentage.
- Click Calculate to see years to double and final amount.
- Use Try Another Rate to run a new calculation.