Unit converters
The Converters line has ten unit converters: length, weight, temperature, speed, energy, pressure, area, power, cooking measures and data size. Each converts both ways as you type, lists the value in every other unit at once, and uses exact defined factors such as 1 inch = 2.54 cm and 1 pound = 0.45359237 kg.
12 tools on the Converters line
- Length ConverterMetres, feet, inches, miles and more.
- Weight ConverterKilograms, pounds, ounces and stone.
- Temperature ConverterCelsius, Fahrenheit and Kelvin.
- Cooking ConverterCups, tablespoons, millilitres for recipes.
- Speed Converterkm/h, mph, m/s and knots.
- Currency ConverterConvert between major world currencies. Also on the Money line.
- Energy ConverterJoules, calories, kWh and BTU.
- Pressure ConverterPascals, bar, PSI and atmospheres.
- Data Size ConverterBytes up to terabytes, decimal and binary.
- Area ConverterSquare metres, acres and hectares.
- Timezone ConverterThe same moment in cities around the world. Also on the Time & Text line.
- Power ConverterWatts, kilowatts and horsepower.
Which converter do I need?
Length Converter
Metres, feet, inches, miles and nautical miles, for DIY projects, travel and running distances.
Weight Converter
Kilograms, pounds, ounces, stone and tons, for recipes, luggage and body weight.
Temperature Converter
Celsius, Fahrenheit, Kelvin and Rankine, for weather, oven settings and science.
Cooking Converter
US cups, tablespoons, teaspoons and fluid ounces to millilitres and litres, for following recipes from other countries.
Area Converter
Square metres, square feet, acres and hectares, for flooring, property listings and land.
Data Size Converter
Decimal (KB, MB, GB) and binary (KiB, MiB, GiB) units, which explains why a 1 TB drive shows about 931 GiB.
Speed, energy, pressure and power
km/h and mph, kcal and kJ, PSI and bar, kW and horsepower: the units on car specs, food labels and tyre gauges.
Questions about converters tools
Are the conversions accurate enough for professional use?
Yes for most work. The converters use exact defined factors, for example 1 ft = 0.3048 m and 1 lb = 0.45359237 kg, and show up to seven significant digits. For regulated work such as medication dosing or legal trade measurements, follow the rounding rules your standard requires.
Which measurement systems are supported?
Metric (SI), US customary and imperial units, plus common specialist units such as knots, nautical miles, BTU, PSI and binary data sizes. Cooking volumes use US customary cups and spoons, which differ slightly from imperial and metric cups.
Do the converters work offline?
Yes, once a page has loaded. Every conversion is calculated in your browser, so the converter you have open keeps working if your connection drops.
Converters guides
- Celsius, Fahrenheit and Kelvin
- Area converter guide: square metres, acres, hectares
- Recipe measurements and scaling
- Bytes, KB, MB, GB and TB
- Joules, calories and BTU
- Metric and imperial length conversion
- Power units explained: watts, horsepower, PS and BTU/h
- PSI, bar and pascal
- Speed and velocity units
- Kilograms, pounds, grams and tons