Free Unit Converter
Convert between 80+ units across 10 categories: length, weight, temperature, volume, area, speed, time, data, energy, and pressure. Type in either direction, swap units instantly, and copy results with one click. Works offline once loaded, no signup required.
Quick conversions
How to Use the Unit Converter
- 1
Select a category
Choose from Length, Weight, Temperature, Volume, Area, Speed, Time, Data, Energy, or Pressure using the category tabs at the top.
- 2
Choose your units
Select the source unit from the left dropdown and the target unit from the right dropdown.
- 3
Enter a value
Type in either input box, the conversion updates instantly in both directions as you type.
- 4
Copy or swap
Click the ↔ swap button to reverse the conversion, or use the copy icon to copy the result directly to your clipboard.
Features
10 Categories, 80+ Units
Length, Weight, Temperature, Volume, Area, Speed, Time, Data, Energy, and Pressure, covering metric, imperial, and scientific units.
Metric & Imperial
Full coverage of SI metric, US customary, and imperial units for accurate global conversions in any context.
Bidirectional Conversion
Type in either input and the other updates instantly. Use the swap button to flip the direction in one click.
Adjustable Precision
Choose 2, 4, 6, or 8 decimal places to match the level of accuracy your work requires.
Click to Copy Result
Copy any conversion result to your clipboard with the copy icon. No selecting text needed.
Conversion History
Session history tracks your last 10 conversions for easy reference during your work. Clears when you close the tab.
Use Cases
International Travel
Convert miles to kilometers, Fahrenheit to Celsius, gallons to liters, and pounds to kilograms before and during your trip.
Cooking & Recipes
Convert cups to milliliters, ounces to grams, and Fahrenheit to Celsius when following international recipes.
Engineering & Science
Convert between SI and imperial units for technical work, with high-precision output for scientific calculations.
Software Development
Convert data storage units (bits, bytes, KB, MB, GB, TB) when working with APIs, file sizes, and database capacities.
Fitness & Health
Convert body weight between kilograms, pounds, and stones, and distances between miles and kilometers for running and cycling.