Simple Interest Calculator
Calculate simple interest on a principal amount.
Calculated locally in your browser. Nothing you enter is uploaded or stored.
Overview
Calculates simple interest, where interest accrues only on the original principal — not on previously earned interest.
How to use it
- 1Enter the principal, annual rate and duration.
- 2View the interest earned and total amount.
Formula
Simple interest
I = P × r × t / 100
P = principal, r = annual rate (%), t = years.
Tips
- This calculator provides an estimate for planning purposes only and is not financial advice.
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