Simple Interest Calculator

Work out simple interest and the total to repay on any loan

Work out simple interest and the total to repay on any loan

Principal amount

Annual interest rate (%)

Time in years (decimals ok)

Privacy: Simple Interest Calculator runs completely in your browser. Your input never leaves your device.

Simple Interest Calculator FAQ

Is Simple Interest Calculator free to use?

Yes, this tool is completely free. There are no fees, subscriptions, or limits — open the page and use it as much as you like.

Does Simple Interest Calculator upload my data?

No. Simple Interest Calculator runs entirely in your browser on your own device. Your text and numbers never leave your computer.

Does Simple Interest Calculator work on mobile?

Yes. The tool is fully responsive and works on Android, iPhone, tablets, laptops, and desktop computers.