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Simple Interest Calculator
Calculate simple interest and the total from principal, rate and time.
Interest: 150
Interest150
Total1,150
Principal1,000
Formula / method
interest = principal × rate × years ÷ 100
Examples
1,000 at 5% for 3y
150 interest
150 interest
2,500 at 4% for 5y
500 interest
500 interest
How to use
Enter your values above — the result updates instantly as you type. Everything is computed locally in your browser, so it is fast and private.
FAQ
How is this different from compound interest?
Simple interest is calculated only on the original principal. Compound interest also earns interest on previously earned interest, so it grows faster over time.