Length, weight, temperature, speed and seven more categories — over 100 units, converted instantly in your browser.
Pick a category, choose your units, and type a value — the result updates as you go.
Enter a valid number to see the conversion.
Your last few conversions will show up here.
Every calculation happens in your browser with plain JavaScript. Nothing you type is uploaded or logged anywhere.
No convert button to click. Change the number or the units and the result recalculates immediately.
From millimetres to nautical miles, milligrams to imperial tons, and pascals to psi — it's all in one place.
The Unit Converter turns a value in one measurement system into its equivalent in another, covering length, weight and mass, temperature, speed, area, volume, time, data storage, pressure and energy. Instead of memorising conversion factors or searching for a formula every time, you pick your source unit and target unit and the tool does the arithmetic for you, live, as you type.
It's built for the moments where accuracy actually matters — converting a recipe from cups to millilitres, checking whether a package is under the airline's kilogram limit in pounds, working out a road-trip speed limit in mph versus km/h, or turning a file size from megabytes into gigabytes before an upload. Students use it for physics and chemistry homework, engineers use it to sanity-check unit conversions in calculations, and travellers use it to translate temperatures and distances on the fly.
Celsius to Fahrenheit for weather, kilometres to miles for driving, kilograms to pounds for body weight, and millilitres to fluid ounces in the kitchen.
PSI to bar for tyre pressure, joules to kilowatt-hours for energy audits, and megabytes to gigabytes when estimating storage or bandwidth.