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Unit Conversions calculators

Length, weight, temperature, volume and 20+ other unit conversions using exact international factors.

Length Converter — how-it-works diagram

Length Converter

Convert mm, cm, metres, kilometres, inches, feet, yards, miles and nautical miles.

Unit Conversions →
Weight Converter — how-it-works diagram

Weight Converter

Convert mg, grams, kilograms, tonnes, ounces, pounds, stone and US tons.

Unit Conversions →
Temperature Converter — how-it-works diagram

Temperature Converter

Convert Celsius, Fahrenheit and Kelvin with absolute-zero validation.

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Volume Converter — how-it-works diagram

Volume Converter

Convert litres, ml, cubic metres, US and imperial gallons, cups, tablespoons and teaspoons.

Unit Conversions →
Area Converter — how-it-works diagram

Area Converter

Convert square metres, hectares, acres, square feet, yards, miles and inches.

Unit Conversions →
Speed Converter — how-it-works diagram

Speed Converter

Convert m/s, km/h, mph, knots, ft/s and Mach number.

Unit Conversions →
Time Converter — how-it-works diagram

Time Converter

Convert seconds, minutes, hours, days, weeks and Julian years.

Unit Conversions →
Data Storage Converter — how-it-works diagram

Data Storage Converter

Convert bits, bytes, KB, MB, GB, TB and the IEC KiB, MiB, GiB, TiB.

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Pressure Converter — how-it-works diagram

Pressure Converter

Convert pascal, kPa, MPa, bar, atm, psi, Torr and inHg.

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Energy Converter — how-it-works diagram

Energy Converter

Convert joules, kJ, calories, kcal, kWh, BTU and foot-pounds.

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Power Converter — how-it-works diagram

Power Converter

Convert watts, kilowatts, megawatts, horsepower (mechanical and metric) and BTU/hr.

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Force Converter — how-it-works diagram

Force Converter

Convert newtons, kilonewtons, dynes, kilogram-force and pound-force.

Unit Conversions →
Torque Converter — how-it-works diagram

Torque Converter

Convert N·m, kN·m, lbf·ft, lbf·in and kgf·m.

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Angle Converter — how-it-works diagram

Angle Converter

Convert degrees, radians, gradians, turns, arcminutes and arcseconds.

Unit Conversions →
Fuel Consumption Converter — how-it-works diagram

Fuel Consumption Converter

Convert mpg (US), mpg (imperial), L/100km and km/L.

Unit Conversions →
Cooking Converter — how-it-works diagram

Cooking Converter

Convert cups, tablespoons, teaspoons, ml, litres and fluid ounces — plus grams for common ingredients.

Unit Conversions →
Shoe Size Converter — how-it-works diagram

Shoe Size Converter

Convert foot length in cm to US men's, US women's, UK and EU shoe sizes.

Unit Conversions →
Density Converter — how-it-works diagram

Density Converter

Convert kg/m³, g/cm³, g/mL, lb/ft³ and lb per US gallon.

Unit Conversions →
Frequency Converter — how-it-works diagram

Frequency Converter

Convert Hz, kHz, MHz, GHz and RPM, with the period in milliseconds.

Unit Conversions →
Height Converter — how-it-works diagram

Height Converter

Convert centimetres to feet and inches, or feet and inches back to centimetres.

Unit Conversions →
Flow Rate Converter — how-it-works diagram

Flow Rate Converter

Convert L/min, L/s, m³/h, US gallons per minute and cubic feet per minute.

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Number to Words Converter — how-it-works diagram

Number to Words Converter

Spell out any whole number from 0 to 999,999,999 in English words.

Unit Conversions →
Roman Numeral Converter — how-it-works diagram

Roman Numeral Converter

Convert numbers 1–3999 to Roman numerals, and valid Roman numerals back to numbers.

Unit Conversions →
Beaufort Scale Converter — how-it-works diagram

Beaufort Scale Converter

Turn wind speed in km/h, mph, m/s or knots into a Beaufort number and description.

Unit Conversions →
Screen Size Calculator — how-it-works diagram

Screen Size Calculator

From diagonal and aspect ratio to screen width, height and area.

Unit Conversions →
Decibel Converter — how-it-works diagram

Decibel Converter

Convert power and amplitude ratios to decibels, and decibels back to ratios.

Unit Conversions →