Free Unit Converter Online
Convert length, weight, temperature, volume, speed, and area units instantly. Swap units with one click.
Key Features
Everything you need in one free tool
Covers length, weight, temperature, volume, speed, and area with dozens of units each.
Conversions update in real time as you type with no page reload required.
browser-side workflows is done locally in your browser. Your data stays private.
About This Tool
A comprehensive unit converter for everyday and scientific conversions. Supports six categories with standard metric and imperial units.
Frequently Asked Questions
What length units are supported?
Length conversions include millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles.
Both metric and imperial systems are fully covered.
All conversions use standard internationally recognized factors.
How does temperature conversion work?
Celsius to Fahrenheit: multiply by 9/5 and add 32.
Celsius to Kelvin: add 273.15.
The tool handles all combinations of Celsius, Fahrenheit, and Kelvin.
What weight units are supported?
Weight conversions include milligrams, grams, kilograms, metric tons, ounces, pounds, and stones.
Both metric and imperial units are included.
All factors match international standards.
What speed units are supported?
Speed conversions include meters per second, kilometers per hour, miles per hour, feet per second, and knots.
These cover the most common speed units used in everyday life and navigation.
Results update instantly as you change any value or unit.
Works in Chrome, Firefox, Safari, Edge, Opera, and other modern browsers on Windows, macOS, Linux, Android, and iOS. No software installation or sign-up required. All conversions run directly in your browser, so your files never leave your device and are never uploaded to a server. Free to use with no account needed.