Unit Converter
Free all-in-one unit converter for length, weight, temperature, area, volume, speed, time and digital storage. Convert between metric and imperial units instantly in your browser.
🔒 Conversions run entirely in your browser — instant and private.
Free Unit Converter
This free all-in-one unit converter instantly changes any value between common units across eight categories — Length, Weight / Mass, Temperature, Area, Volume, Speed, Time and Digital Storage. Pick a category, choose your from and to units, and the answer appears live as you type — along with the same value shown in every unit of that category. It’s free, accurate and runs entirely in your browser, so your data never leaves your device.
How to use the unit converter
- Choose a category (Length, Weight, Temperature, and so on) from the row of buttons.
- Pick the From unit and the To unit in the two dropdowns.
- Type a value in the input box — the converted result updates instantly.
- Use the ⇆ Swap button to flip the two units, or Copy result to grab the answer.
- Scroll down to the All units list to see your value in every unit at once.
Common conversions
Here are a few everyday equivalences this converter handles for you:
- 1 kilometre = 0.621 miles
- 1 kilogram = 2.2046 pounds
- 1 inch = 2.54 centimetres
- 0°C = 32°F
- 1 litre = 0.264 US gallon
- 1 GB = 1024 MB
Why metric vs imperial matters
Most of the world uses the metric system (metres, kilograms, litres, Celsius), while the United States and a few other places still use imperial / US customary units (feet, pounds, gallons, Fahrenheit). Mixing them up causes real problems — recipes, travel distances, fuel economy and engineering specs all depend on getting the conversion right. A reliable converter removes that guesswork, so a measurement in one system can be read instantly in the other without mental arithmetic or rounding mistakes.