Unit Converter
Free Online Unit Converter – Length, Weight, Temperature & More
Our free online unit converter lets you instantly convert between hundreds of measurement units across 11 categories including length, mass, temperature, volume, speed, energy, power, pressure, angle, area, and time. Whether you're a student, engineer, scientist, or everyday user, this tool gives you fast, accurate unit conversions with no calculations required.
Simply select a category, choose your units, enter a value, and get instant results. A quick reference panel shows common conversions at a glance.
Length / Distance
Convert between meters, kilometers, miles, feet, inches, centimeters, yards, and nautical miles.
Mass / Weight
Convert between kilograms, grams, pounds, ounces, stones, metric tons, and more.
Temperature
Convert between Celsius, Fahrenheit, Kelvin, and Rankine for weather, cooking, and science.
Time
Convert between seconds, minutes, hours, days, weeks, months, and time units down to nanoseconds.
Volume
Convert between liters, gallons, cups, fluid ounces, milliliters, and more for cooking and science.
Speed / Velocity
Convert between km/h, mph, m/s, knots, and Mach for travel and physics calculations.
How to Use the Unit Converter
- Select a category from the dropdown (e.g., Length / Distance)
- Choose the unit to convert from and the unit to convert to
- Enter your value — results appear instantly
- Click the swap button to quickly reverse the conversion direction
- Click Copy Result to copy the conversion to your clipboard
- Use the Quick Reference panel to see common conversion benchmarks
Features of This Unit Converter Tool
- 11 conversion categories
- Over 100 supported units
- Instant real-time conversion
- One-click swap between units
- Copy result to clipboard
- Quick Reference panel
- Works on mobile & desktop
- 100% Free to use
Frequently Asked Questions
Yes. You can use this tool unlimited times at no cost.
The converter supports Length/Distance, Mass/Weight, Time, Temperature, Area, Volume, Speed/Velocity, Energy/Work, Power, Pressure, and Angle.
All conversions use precise mathematical factors and are accurate to multiple decimal places, suitable for academic and professional use.
No. All conversions happen locally in your browser.
About VioApps
VioApps is a collection of useful utility tools designed to help you with everyday tasks. Our mission is to provide simple, fast, and reliable tools that work right in your browser.
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