How to Convert Units: A Fast, Offline Guide
Updated 2026-06-21
To convert units, pick the measurement type (length, weight, temperature, and so on), choose your "from" and "to" units, and type a number — the answer appears instantly. The Unit & Measurement Converter does this entirely in your browser, so it works offline and nothing you type ever leaves your device.
Convert any measurement in three steps
- Choose a category. Select what you're measuring: length, mass/weight, temperature, area, speed, data, or volume. Each category loads its own set of real units, so you can't accidentally mix incompatible ones.
- Set the from and to units. For example, Centimetre to Inch, or Kilogram to Pound. A swap button flips the two so you can reverse the conversion without retyping.
- Type your value. The result updates live as you type. There's no convert button to click and no page reload.
A worked example: to find out how tall 180 cm is in feet, pick Length, set from to Centimetre and to to Foot, then enter 180. You'll get roughly 5.91 ft. The tool also shows the value in the category's base unit (metres here), and can convert your number into every unit in the category at once — handy when you're not sure which target you actually need.
Common conversions it handles
- Length: cm to inches, miles to km, metres to feet, plus nautical miles.
- Weight/mass: kg to lbs, grams to ounces, stone, and metric tonnes.
- Temperature: Celsius to Fahrenheit and Kelvin (handled with proper offset formulas, not just a multiply).
- Area: square metres, hectares, acres, and square feet for land and floor plans.
- Speed: km/h to mph for travel and weather.
- Volume: litres to gallons and millilitres for cooking and recipes.
Watch out for data units
Data storage is the one place unit conversion quietly trips people up. Decimal units (kB, MB, GB) are powers of 1000, while binary units (KiB, MiB, GiB) are powers of 1024. That's why a "500 GB" drive shows up as roughly 465 GiB in your operating system — nothing is missing, the two systems just count differently. The converter keeps decimal and binary units separate and labeled, so you can convert MB to MiB deliberately instead of guessing. If a number ever looks off by a few percent, check whether you've mixed the two systems.
Why convert in the browser
Everything runs locally as client-side code. There's no upload, no account, and no tracking of the numbers you enter — useful when you're working with measurements from private documents, lab data, or engineering specs. Because the math runs on your device, it also keeps working on a plane or anywhere the connection drops.
Ready to convert? Open the Unit & Measurement Converter, pick your category, and get an instant answer.