💰 Finance~40.5K searches/moFree · No signup
Simple Interest Calculator
Calculate simple interest and total repayment using I = P × r × t.
How to use this tool
- 1Enter your figures in the fields above.
- 2Results update instantly as you type.
- 3Adjust the inputs to compare different scenarios.
Frequently asked questions
When is simple interest used?+
Simple interest is common on short-term loans, car loans and some personal loans where interest is charged only on the original principal.
Is this calculator free?+
Yes. It's completely free, needs no sign-up, and runs entirely in your browser so your numbers stay private.
Learn more
- Simple vs compound interest
- How car loan interest works
- Simple interest worked examples