Unit converters
Convert weight, length, area, volume, temperature, speed, pressure, energy, cooking measures and shoe sizes.
Part of Converters & Calculators
- Unit ConverterConvert length, weight, area, volume, temperature, speed, pressure, energy, power, data, fuel economy and time with exact factors.
- Weight ConverterKilograms, pounds, ounces, stone, grams, tonnes, short and long tons, troy ounces and carats, converted both ways.
- Length ConverterMillimetres, centimetres, metres, kilometres, inches, feet, yards, miles and nautical miles, converted both ways.
- Area ConverterSquare feet, square metres, acres, hectares, square yards, square miles and square kilometres, converted both ways.
- Volume ConverterLitres, millilitres, US and imperial gallons, pints, fluid ounces, cups, spoons, cubic feet and cubic metres.
- Temperature ConverterCelsius, Fahrenheit, Kelvin and Rankine, converted with the exact offset formulas and a common-values table.
- Speed Converterkm/h, mph, metres per second, knots and feet per second, converted both ways with exact factors.
- Pressure Converterpsi, bar, kPa, hPa/mbar, atmospheres, mmHg, torr, inHg and kgf/cm², for tyres, weather, blood pressure and engineering.
- Energy ConverterJoules, kilojoules, calories and kilocalories, watt-hours and kWh, BTU, foot-pounds and electronvolts.
- Power ConverterWatts, kilowatts, megawatts, mechanical and metric horsepower, BTU per hour, kcal per hour and tons of refrigeration.
- Data Storage ConverterBytes, kB/MB/GB/TB (decimal) and KiB/MiB/GiB/TiB (binary), plus bits, kilobits, megabits and gigabits.
- Fuel Economy ConverterMiles per gallon (US and UK), litres per 100 km and kilometres per litre, converted with the correct reciprocal formulas.
- Time Unit ConverterNanoseconds to centuries: seconds, minutes, hours, days, weeks, average months and Gregorian years.
- kg to lbsConvert kilograms to pounds with the exact factor (1 kg = 2.20462 lb), plus a table from 0.5 to 100 kg.
- lbs to kgConvert pounds to kilograms with the exact definition (1 lb = 0.45359237 kg), plus a table from 1 to 250 lb.
- cm to inchesConvert centimetres to inches (1 in = 2.54 cm exactly), with a quick-reference table up to 150 cm.
- inches to cmConvert inches to centimetres (× 2.54 exactly), with a table covering fractions of an inch and common screen sizes.
- feet to metersConvert feet to metres (1 ft = 0.3048 m exactly), with a table from 1 to 10,000 ft.
- meters to feetConvert metres to feet (divide by 0.3048), with a table from 1 m to 1000 m.
- km to milesConvert kilometres to miles (÷ 1.609344), with race distances from 5K to the marathon.
- miles to kmConvert miles to kilometres (× 1.609344 exactly), with a table from 1 to 1000 miles.
- Celsius to FahrenheitConvert °C to °F with the exact formula (× 9/5 + 32), plus a table of weather, body and oven temperatures.
- Fahrenheit to CelsiusConvert °F to °C with the exact formula ((°F − 32) × 5/9), plus a table of weather, body and oven temperatures.
- liters to gallonsConvert litres to US gallons (÷ 3.785411784) or imperial gallons (÷ 4.54609), with a quick-reference table.
- grams to ouncesConvert grams to avoirdupois ounces (÷ 28.349523125), with a table for cooking and postage weights.
- ounces to gramsConvert ounces to grams (× 28.349523125 exactly), with a table from ¼ oz to 2 lb.
- mph to km/hConvert miles per hour to kilometres per hour (× 1.609344), with a table of common speed limits.
- square feet to square metersConvert sq ft to m² (× 0.09290304 exactly), with a table of apartment and house sizes.
- Feet and inches to cmConvert a height in feet and inches to centimetres and back, with a table from 4 ft 6 in to 7 ft.
- Cups to Grams ConverterConvert cups, tablespoons and teaspoons to grams or ounces (and back) for 50 common baking and cooking ingredients.
- Shoe Size ConverterConvert men's, women's and children's shoe sizes between US, UK, EU and foot length in cm (Mondopoint), with full charts.
- Ring Size ConverterConvert ring sizes between US/Canada, UK/Australia letters, ISO 8653 (EU) circumference and inner diameter in mm.
- Clothing Size ConverterApproximate women's and men's clothing sizes across US, UK, EU, France, Italy and Japan, with the full tables.
Every converter here uses exact factors: an inch is 2.54 cm and a pound 0.45359237 kg by definition, so results are only ever rounded for display. Start with the all-in-one unit converter, or go straight to a category such as weight, length, temperature or data storage (where 1 GB and 1 GiB differ by 7%).
The pair pages answer the questions people actually type, with a chart and worked examples: kg to lbs for luggage and body weight, °C to °F for weather and ovens, cm to inches and height in feet and inches for forms. Cooking and shopping have their own tools: cups to grams by ingredient, and shoe, ring and clothing size charts.