Converters
Convert anything in an instant: units of measure, number bases, file sizes, Roman numerals and more. Accurate, live results with no sign-up.
Unit converter
Convert lengths, weights and temperatures.
Number base converter
Binary, octal, decimal and hexadecimal.
Data storage converter
Bytes, KB, MB, GB, TB… in an instant.
Roman numerals converter
Convert numbers ⇄ Roman numerals.
Number to words
Spell out any number in words, error-free.
Scientific calculator
Type a full expression: trigonometry, roots, powers.
Shoe size converter
Convert EU, UK, US and cm shoe sizes for men, women and kids.
Clothing size converter
Convert FR/EU, UK, US and IT sizes for tops and trousers.
Height: feet-inches ↔ cm
Convert a height between feet/inches and centimetres.
Fuel consumption converter
Convert L/100 km, MPG (US/UK) and km/L, and estimate a trip’s cost.
Ring size converter
Convert diameter and circumference into FR, US and UK ring sizes.
Fraction & decimal converter
Convert decimal ↔ simplified fraction (GCD) and compute + and ×.
Download time calculator
Estimate a download’s duration from file size and speed (fibre, 4G, ADSL).
Scientific notation converter
Convert between scientific, decimal, engineering notation and significant figures.
Country info
Capital, population, currency, flag and dialing code of a country.
Temperature converter
Convert instantly between Celsius, Fahrenheit and Kelvin.
Speed converter
Convert between km/h, mph, m/s, knots and ft/s, live.
Weight converter
Convert between kilograms, grams, pounds, ounces, stones and tonnes, live.
Length converter
Convert between mm, cm, m, km, inches, feet, yards and miles, live.
Time converter
Convert seconds, minutes, hours, days and weeks instantly.
Area converter
Convert m², km², ft², yd², acres and hectares in an instant.
Volume converter
Convert litres, millilitres, m³, gallons, pints and cups in an instant.
Energy converter
Convert joules, kilojoules, calories, kilocalories, watt-hours and kWh in an instant.
Pressure converter
Convert pascals, kilopascals, bars, psi, atmospheres and mmHg in an instant.
Power converter
Convert watts, kilowatts, horsepower (hp and PS), BTU/h and kcal/h in an instant.
Angle converter
Convert degrees, radians, gradians, turns, arcminutes and arcseconds in an instant.
Frequency converter
Convert hertz, kilohertz, megahertz, gigahertz and revolutions per minute in an instant.
Number base converter
Binary, octal, decimal, hex and base 2-36.