Simple Interest Calculator
Calculate simple interest and the total value from a principal, rate and time period.
Loading Tool…
Loading Tool…
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.
Found an issue? Send Feedback. See our data sources and update policy for tools that depend on changing information.
Popular Tools
Text Tools
Title Case Converter
Convert text to title case with smart rules for articles, conjunctions and prepositions.
Developer Tools
QR Code Generator
Create styled QR codes for URLs, text, email, SMS and calendar events, then export them for screen or print.
Developer Tools
JSON Formatter & Minifier
Beautify, validate and minify JSON with clear parse errors.
Font Styles
Unicode Text Converter
Preview your text in 35+ Unicode styles at once with copy buttons and favorites.
Text Tools
Word Counter
Count words, characters, sentences and paragraphs in real time, with reading time and keyword density.
Crypto & Security
Strong Password Generator
Generate secure random passwords using cryptographic randomness.