Unit Converter

Enter your distance in the From field, select Length as the category, choose Kilometre in the From dropdown and Mile in the To dropdown. The result appears instantly. The exact factor is 1 km = 0.621371 miles, so 100 km equals 62.14 miles.

Select the Temperature category, set From to Celsius and To to Fahrenheit, then type your temperature. The formula used is °F = (°C × 9/5) + 32. For quick reference: 0 °C = 32 °F, 20 °C = 68 °F, 37 °C = 98.6 °F (body temperature), and 100 °C = 212 °F.

Pick the Weight category, set From to Kilogram and To to Pound, then enter your value. The factor is 1 kg = 2.20462 lb, so 70 kg equals approximately 154.32 lb.

One mile equals exactly 1.609344 kilometres. Miles are used primarily in the United States, United Kingdom, and a few other countries, while kilometres are the standard unit of road distance for most of the world.

Celsius, Fahrenheit, Kelvin, and Rankine all use different zero points. Celsius sets 0 at water's freezing point; Fahrenheit sets 0 at a historical brine solution reference; Kelvin starts at absolute zero (−273.15 °C). Because the scales are offset, you cannot simply multiply — you must also add or subtract a constant. The converter handles all four scales automatically.

A gigabyte (GB) equals exactly 1,000,000,000 bytes (10⁹), following the SI decimal prefix system. A gibibyte (GiB) equals 1,073,741,824 bytes (2³⁰), following the IEC binary prefix system. Operating systems traditionally report storage in GiB but label it "GB", which is why a "1 TB" hard drive shows as roughly 931 GiB in Windows or macOS. This converter supports both SI (KB, MB, GB, TB) and IEC (KiB, MiB, GiB, TiB) units.

Select Speed, set From to Mile / Hour and To to Kilometre / Hour. The factor is 1 mph = 1.60934 km/h. So 60 mph equals approximately 96.56 km/h — close enough to 100 km/h that many drivers use "100 km/h ≈ 62 mph" as a mental shortcut.

Yes. You can type in either input field. If you type in the To field, the converter reverses direction and computes the From value automatically. You can also click the ⇄ Swap button to flip the units and carry the result across as the new input.

Select the Area category, choose Sq. Foot as the From unit and Sq. Metre as the To unit, then type your value. The exact factor is 1 ft² = 0.09290304 m². The All Conversions table also shows your value in acres, hectares, square kilometres, and more at the same time.

The Pressure category covers Pascal (Pa), Hectopascal (hPa), Kilopascal (kPa), Megapascal (MPa), Bar, Millibar (mbar), PSI, Atmosphere (atm), mmHg (Torr), and Inch of Mercury (inHg). These cover everyday use cases like tyre pressure (PSI, bar), atmospheric pressure (hPa, atm), and engineering applications (MPa, Pa).

Results are calculated to 7 significant figures, which is sufficient for the vast majority of scientific, engineering, and everyday applications. All conversion factors follow international standards — SI definitions, exact imperial definitions (e.g. 1 inch = 25.4 mm exactly), and IUPAC values for physical constants. For temperature, Kelvin absolute zero is set at −273.15 °C per the BIPM definition.

Yes. The tool is fully responsive. On mobile the two input fields stack vertically, the unit dropdowns are touch-friendly, and the Swap button is centred between the fields for easy thumb access. No app download or sign-in is required.

Select the Energy category, set From to Kilocalorie and To to Kilojoule. The factor is 1 kcal = 4.184 kJ. The category also supports Joules, Megajoules, Watt-hours, BTU, Electronvolts, and Foot-Pounds — useful for nutrition labels, physics problems, and engineering calculations alike.