Convert length, weight, temperature, area, volume, speed, time and data units instantly. Choose two units, enter a value, and get an accurate result as you type.
This all-in-one measurement converter handles metric, imperial and US customary units in a fast, uncluttered workspace. Use it for recipes, travel, schoolwork, engineering estimates or everyday calculations. Every conversion runs locally in your browser.
Convert length, weight and mass, temperature, area, volume, speed, time and digital storage without switching tools.
No submit button or page reload. Change a value or unit and the answer updates immediately.
Useful decimals are preserved automatically, and one click copies the result to your clipboard.
Select a category at the top of the calculator to switch between common measurement systems. The tool includes the units people most often need for work, travel, cooking and study.
Convert metres, kilometres, centimetres and millimetres to miles, yards, feet or inches.
Convert kilograms, grams, milligrams and tonnes to pounds, ounces or stone.
Convert Celsius to Fahrenheit or Kelvin, and reverse the calculation with one click.
Convert square units, hectares and acres, plus litres, millilitres, gallons, cups and fluid ounces.
Convert km/h, mph, knots and metres per second, or switch between seconds, minutes, hours and days.
Convert bytes, kilobytes, megabytes, gigabytes and terabytes, including binary KiB, MiB and GiB units.
These reference values show several common conversions. For any other amount, enter your number in the online unit converter above.
| Conversion | Result |
|---|---|
| 1 kilometre to miles | 0.621371 miles |
| 1 mile to kilometres | 1.609344 km |
| 1 kilogram to pounds | 2.204623 lb |
| 1 pound to kilograms | 0.453592 kg |
| 100 degrees Celsius to Fahrenheit | 212°F |
| 1 US gallon to litres | 3.785412 L |
Choose a measurement category, select the original and target units, then type a number. Use the green swap button to reverse the conversion instantly.
You can convert length, weight and mass, temperature, area, volume, speed, time and digital storage units.
The tool uses standard mathematical conversion factors and displays up to ten useful decimal places. Small differences can occur when a source standard itself is rounded.
Yes. The converter is free to use. Calculations happen entirely in your browser, and the values you enter are not saved or uploaded by this tool.
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