Interest Rate Calculator
Find the annual interest rate on a loan or deposit
Use this when you need a fast, accurate result — no sign-up, works entirely in your browser.
Annual interest rate—
How to Use
- Enter your details into the fields above.
- Click the calculate button to get your result instantly.
- Use the clear button to start a new calculation.
Example
- Principal $1,000, total interest $300, 5 years → Annual interest rate = 6%
- Borrowed $5,000, paid $1,500 interest over 6 years → Simple annual interest rate = 5%
Formula
Simple interest rate = (total interest ÷ principal ÷ years) × 100. For compound scenarios the rate is derived iteratively.
About Interest Rate Calculator
Find the annual interest rate on a loan or deposit. This free online tool gives you fast, accurate results without registration or downloads.
Everything runs locally in your browser, so your data is never uploaded or stored — privacy first.
Frequently Asked Questions
How do I find the interest rate on a loan? +
Enter the principal, the total interest paid, and the time in years. The calculator returns the equivalent simple annual interest rate.
Is simple or compound interest used? +
This tool computes the simple interest rate. For compound scenarios, use the Compound Interest or CD calculator.
Is this calculator free? +
Yes, it is completely free with no registration or download.