Unit Conversions calculators
Length, weight, temperature, volume and 20+ other unit conversions using exact international factors.
Length Converter
Convert mm, cm, metres, kilometres, inches, feet, yards, miles and nautical miles.
Weight Converter
Convert mg, grams, kilograms, tonnes, ounces, pounds, stone and US tons.
Temperature Converter
Convert Celsius, Fahrenheit and Kelvin with absolute-zero validation.
Volume Converter
Convert litres, ml, cubic metres, US and imperial gallons, cups, tablespoons and teaspoons.
Area Converter
Convert square metres, hectares, acres, square feet, yards, miles and inches.
Speed Converter
Convert m/s, km/h, mph, knots, ft/s and Mach number.
Time Converter
Convert seconds, minutes, hours, days, weeks and Julian years.
Data Storage Converter
Convert bits, bytes, KB, MB, GB, TB and the IEC KiB, MiB, GiB, TiB.
Pressure Converter
Convert pascal, kPa, MPa, bar, atm, psi, Torr and inHg.
Energy Converter
Convert joules, kJ, calories, kcal, kWh, BTU and foot-pounds.
Power Converter
Convert watts, kilowatts, megawatts, horsepower (mechanical and metric) and BTU/hr.
Force Converter
Convert newtons, kilonewtons, dynes, kilogram-force and pound-force.
Torque Converter
Convert N·m, kN·m, lbf·ft, lbf·in and kgf·m.
Angle Converter
Convert degrees, radians, gradians, turns, arcminutes and arcseconds.
Fuel Consumption Converter
Convert mpg (US), mpg (imperial), L/100km and km/L.
Cooking Converter
Convert cups, tablespoons, teaspoons, ml, litres and fluid ounces — plus grams for common ingredients.
Shoe Size Converter
Convert foot length in cm to US men's, US women's, UK and EU shoe sizes.
Density Converter
Convert kg/m³, g/cm³, g/mL, lb/ft³ and lb per US gallon.
Frequency Converter
Convert Hz, kHz, MHz, GHz and RPM, with the period in milliseconds.
Height Converter
Convert centimetres to feet and inches, or feet and inches back to centimetres.
Flow Rate Converter
Convert L/min, L/s, m³/h, US gallons per minute and cubic feet per minute.
Number to Words Converter
Spell out any whole number from 0 to 999,999,999 in English words.
Roman Numeral Converter
Convert numbers 1–3999 to Roman numerals, and valid Roman numerals back to numbers.
Beaufort Scale Converter
Turn wind speed in km/h, mph, m/s or knots into a Beaufort number and description.
Screen Size Calculator
From diagonal and aspect ratio to screen width, height and area.
Decibel Converter
Convert power and amplitude ratios to decibels, and decibels back to ratios.