Simple Interest Calculator
Free simple interest calculator: enter principal, annual rate and time to get the interest and the total amount, with a year-wise breakdown. Try it now.
Simple Interest Calculator — Calculate SI on Any Amount
Simple interest is calculated only on the original principal — the interest doesn't earn interest. It's commonly used for short-term loans, vehicle finance, friend-to-friend lending, and certain bank products. Our Simple Interest Calculator gives you the exact interest amount and total payable instantly.
Enter the principal, annual interest rate, and time period. Get the interest earned, total amount, and a detailed breakdown. No signup, no cost.
How to Calculate Simple Interest
1. Enter Principal
Type the original amount borrowed or invested.
2. Enter Rate
Enter the annual interest rate as a percentage.
3. Set Time Period
Enter the duration in years — one year or more, and part-years such as 2.5 work too.
4. View Result
See the interest amount, the total payable, and a year-by-year breakdown.
Calculator Features
Year-Wise Breakdown
A table shows the interest added each year and the running total, so you can see the steady, straight-line growth of simple interest.
Standard SI Formula
Interest is charged on the original principal only: SI = (P × R × T) / 100, the same amount every year.
Visual Breakdown
A chart shows how much of the total is principal and how much is interest.
Multiple Currencies
Show amounts in any of 20 currency symbols, from the rupee and US dollar to the euro, pound and yen. Only the symbol changes; nothing is converted.
Type or Slide
Drag a slider, or type an exact figure into the box beside it — typed amounts can go past the end of the slider.
Free and Private
No signup, no tracking. Runs entirely in your browser.