Simple Interest Calculator
Calculate simple interest and the total value from a principal, rate and time period.
Simple interest = Principal × Rate × Time. No compounding.
DISCLAIMER: This calculator provides estimates for general informational and educational purposes only and is not financial, investment, tax, or legal advice. Results are approximate and may not reflect your actual situation, fees, taxes, or current rates. Consult a qualified professional before making financial decisions.
What Is the Simple Interest Calculator?
The Simple Interest Calculator works out interest using the classic formula Interest = Principal × Rate × Time, with no compounding. Enter the principal, annual rate and time in years to see the interest earned and the total value. It runs entirely in your browser.
How It Works
Enter the principal amount, the annual interest rate and the time in years. The interest earned and total value update instantly.
When to Use It
Use it for short-term loans, bonds and savings that pay simple interest, or for homework and quick checks where interest isn't compounded.
Frequently Asked Questions
- How is simple interest different from compound interest?
- Simple interest is calculated only on the original principal. Compound interest is calculated on the principal plus previously earned interest, so it grows faster — use the Compound Interest Calculator for that.
Last reviewed: 2026-06-27