Conversion Calculators
Units of length, weight, volume, temperature, speed and data.
- Acres to Square Feet Calculator Convert acres to square feet exactly, with square metres, hectares, square yards and the side of an equal square plot.
- Area Converter Convert areas between square millimetres, metres and kilometres, hectares, square inches, feet, yards and miles, and acres.
- Celsius to Fahrenheit Calculator Convert degrees Celsius to Fahrenheit with the formula shown step by step, plus kelvin and a quick mental estimate.
- cm to Inches Calculator Convert centimetres to inches, with feet and inches and the nearest sixteenth of an inch as on a tape measure.
- Data Storage Converter Convert data sizes between bits, bytes, KB, MB, GB, TB and PB, and binary KiB, MiB, GiB and TiB.
- Data Transfer Rate Converter Convert data rates between bps, kbps, Mbps and Gbps and bytes per second (kB/s, MB/s, GB/s, MiB/s), with transfer times.
- Energy Converter Convert energy between joules, kilojoules, calories, kilocalories, kWh, BTU, therms, foot-pounds and electronvolts.
- Fahrenheit to Celsius Calculator Convert degrees Fahrenheit to Celsius with the formula shown step by step, plus kelvin and a quick mental estimate.
- Feet to Meters Calculator Convert feet, or feet and inches such as a height, to metres, with centimetres, millimetres and yards.
- Fuel Economy Converter Convert fuel economy between US mpg, UK mpg, litres per 100 km and km per litre, with fuel for 100 km and 100 miles.
- Gallons to Liters Calculator Convert US or UK gallons to litres exactly, with millilitres, the other gallon, and a price per litre from a price per gallon.
- Grams to Ounces Calculator Convert grams to ounces exactly, with pounds, troy ounces for gold and silver, and the nearest quarter ounce for cooking.
- Hectares to Acres Calculator Convert hectares to acres exactly, with square metres, square kilometres, square feet and a price per hectare as a price per acre.
- Inches to cm Calculator Convert inches, or feet and inches such as a height, to centimetres, metres and millimetres exactly.
- Joules to Calories Calculator Convert joules to calories and kilocalories exactly, with kilojoules, International Table calories and watt-hours.
- kg to Pounds Calculator Convert kilograms to pounds exactly, with pounds and ounces, stone and pounds, and total ounces.
- km to Miles Calculator Convert kilometres to miles exactly, with yards or feet, nautical miles and walking and driving times.
- Knots to mph Calculator Convert knots to miles per hour and km/h exactly, with metres per second, distance per day and the Beaufort wind force.
- Length Converter Convert lengths and distances between millimetres, centimetres, metres, kilometres, inches, feet, yards and miles.
- Liters to Gallons Calculator Convert litres to US and UK gallons exactly, with quarts, pints and fluid ounces, and a price per gallon from a price per litre.
- Meters to Feet Calculator Convert metres to feet, and to feet and inches, inches and yards, using the exact factor of 0.3048 metres per foot.
- Miles to km Calculator Convert miles to kilometres exactly, with metres, nautical miles and walking and driving times.
- ml to oz Calculator Convert millilitres to US or UK fluid ounces exactly, with cups, tablespoons and teaspoons and the weight of the same volume of water.
- mph to km/h Calculator Convert miles per hour to kilometres per hour exactly, with metres and feet per second and the distance covered each second.
- Ounces to Grams Calculator Convert ounces to grams exactly, for everyday (avoirdupois) ounces or troy ounces used for gold and silver.
- Pounds to kg Calculator Convert pounds, or pounds and ounces, to kilograms and grams exactly, with total ounces and stone.
- Power Converter Convert power between watts, kilowatts, megawatts, horsepower, metric horsepower, BTU per hour and foot-pounds per second.
- Pressure Converter Convert pressure between psi, bar, kPa, pascals, atmospheres, millibars, mmHg and inches of mercury.
- psi to bar Calculator Convert psi to bar exactly, with kPa, MPa and atmospheres, and the absolute pressure for a gauge reading such as a tyre.
- Roman Numeral Converter Convert numbers from 1 to 3,999 to Roman numerals, or Roman numerals back to numbers, with the breakdown of each symbol.
- Shoe Size Converter Convert adult shoe sizes between UK, EU, US men's and US women's sizes, or from foot length, with the approximate foot length and Mondopoint.
- Speed Converter Convert speeds between km/h, mph, metres per second, knots and feet per second, with pace and travel time.
- Square Feet to Square Meters Calculator Convert square feet to square metres exactly, from an area or a room's length and width, with a price per square foot as per square metre.
- Stone to Pounds Calculator Convert stone, or stone and pounds, to pounds and kilograms, as body weight is often given in the UK and Ireland.
- Temperature Converter Convert temperatures between Celsius, Fahrenheit, kelvin and Rankine, as readings or as temperature differences.
- Time Converter Convert time between seconds, minutes, hours, days, weeks and years, with a days-hours-minutes breakdown.
- Tons to Yards Calculator Convert tons of gravel, sand, soil, mulch or other bulk material to cubic yards, with how much area that covers at common depths.
- Unit Converter Convert length, weight, volume, area, temperature, speed and time between metric and imperial units, with the exact factor.
- Volume Converter Convert volumes between millilitres, litres, cubic metres, US and UK gallons, pints, cups, fluid ounces and spoons.
- Watts to Horsepower Calculator Convert watts to mechanical, metric and electrical horsepower exactly, with kilowatts and the energy used in an hour.
- Weight Converter Convert weights between milligrams, grams, kilograms, tonnes, ounces, pounds, stone and US and UK tons.
- Yards to Tons Calculator Convert cubic yards of gravel, sand, soil or other bulk material to tons and pounds, with pickup and dump truck loads to haul it.