Rule of 72 Calculator
Estimate how long to double your money. Free, instant.
How to Use Rule of 72 Calculator
1
Enter expected annual return.
2
Get years to double your money.
3
Copy or download your result.
Frequently Asked Questions
How accurate is the Rule of 72?
Very accurate for rates between 4–12%. For 7% return, it gives ~10.3 years (actual: 10.24).