Unit Converter

Free online unit converter

Convert lengths, weights, temperatures, volumes, speeds, areas, durations or data sizes. The result appears instantly as you type, in both directions, and everything stays in your browser.

Convert length units

Go from metres to feet, kilometres to miles, or centimetres to inches. For example, 10 metres is about 32.81 feet, and 1 inch is exactly 25.4 millimetres.

Convert a temperature

The formulas used are °F = °C × 9/5 + 32 and K = °C + 273.15. So 0°C equals 32°F and 273.15 K: the freezing point of water.

Convert weight, volume and speed

Useful for a recipe (cups, millilitres), a trip (kilometres per hour, miles per hour) or a luggage weight (kilograms, pounds). Pick a category above, and both fields update as you type.

Convert area units

Compare square metres, square feet, hectares and acres — useful for a plot of land, a flat or a farm. A hectare is 10,000 m², and an acre is about 4,047 m².

Convert a duration

Move between seconds, minutes, hours, days and years to compare durations or plan a schedule. A day is 86,400 seconds, and a year here averages 365.25 days to account for leap years.

Convert data sizes

File and storage sizes follow the binary convention: 1 kilobyte is 1,024 bytes, not 1,000. The same factor applies at every step, up to a terabyte being 1,024 gigabytes.