Simple interest calculator
Interest = principal × rate × time. Cross-links to compound.
Runs in this tab. The file stays here.
Interest 500.00; amount 1,500.00
This runs in your browser. Nothing is uploaded.
About Simple interest calculator
Interest = principal × rate × time, offline.
No compounding. Useful for short notes and teaching the contrast with compound growth.
How to use Simple interest calculator
- 1Enter principal, annual rate, years.
- 2Read interest and amount.
Common questions
When should I use compound instead?
Whenever interest itself earns interest — open the compound interest calculator.
Related tools
Why this one doesn't upload your file
There is no server to upload to. This page is a static file, and the work happens in your browser using the same graphics and WebAssembly code that renders every other site you visit. Your file is read from disk into memory, processed, and handed back as a download. Once the page has loaded you can disconnect from the network entirely and it keeps working. The longer explanation