Finance
Rule of 72 Calculator
Years to double at a constant annual rate.
Free to use — no sign-up or login.
Years to double
Amortization schedule
| # | Date | Payment | Principal | Extra | Interest | Balance |
|---|---|---|---|---|---|---|
This free Rule of 72 Calculator covers Years to double at a constant annual rate.
Rule of 72 estimates doubling time as 72 ÷ rate%. Related finance tools sit beside How it works, with no account required.
Using the Rule of 72 Calculator
Years to double at a constant annual rate. Typical inputs are Annual rate (%). How it works beside the form states the identity the Rule of 72 Calculator applies.
FAQ
How do I use the Rule of 72 Calculator?
Open the Rule of 72 Calculator, fill Annual rate (%), and read the result. Enter Annual rate (%) for the Rule of 72 Calculator; enter percentage fields as percentage points. The calculator reports Years to double: Rule of 72 estimates doubling time as 72 ÷ rate%. The shortcut is most accurate for moderate positive rates with annual compounding.
What formula does the Rule of 72 Calculator use?
The Rule of 72 Calculator uses the identity in How it works. In words: Enter Annual rate (%) for the Rule of 72 Calculator; enter percentage fields as percentage points. The calculator reports Years to double: Rule of 72 estimates doubling time as 72 ÷ rate%. The shortcut is most accurate for moderate positive rates with annual compounding.
Assumptions and limitations
Finance results are illustrative. They typically omit taxes, fees, prepayment penalties, and product rules, and they are not investment or lending advice.