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Unit converters

Convert measurements, quantities and data using one authoritative unit registry.

Most useful tools

Length converterConvert metric and imperial length units.Weight converterConvert kilograms, pounds and more.Temperature converterConvert Celsius, Fahrenheit and Kelvin.Volume converterConvert litres, gallons, cups and more.Data storage converterConvert bytes, KB, MB, GB and TB.Speed converterConvert km/h, mph, knots and m/s.

Explore by topic

Measurement converters

Length, mass, area and volume.

Science and motion

Temperature, speed, pressure and energy.

Time and digital data

Durations and decimal or binary storage.

About these tools

Choose a full converter when you want to compare several units, or use a direct conversion page for a common pair. US customary, Imperial, metric, decimal-storage and binary-storage distinctions are labelled explicitly.

All tools in this category

Temperature converterConvert Celsius, Fahrenheit and Kelvin.Length converterConvert metric and imperial length units.Weight converterConvert kilograms, pounds and more.Data storage converterConvert bytes, KB, MB, GB and TB.Area converterConvert square units, acres and hectares.Volume converterConvert litres, gallons, cups and more.Speed converterConvert km/h, mph, knots and m/s.Time converterConvert seconds, minutes, hours and days.Pressure converterConvert Pa, kPa, MPa, bar, psi, atm and mmHg.Energy converterConvert joules, calories, watt-hours, kWh and BTU.

Popular direct conversions

cm to ftcentimetre to foot ft to cmfoot to centimetre cm to incentimetre to inch in to cminch to centimetre m to ftmetre to foot ft to mfoot to metre kg to lbkilogram to pound lb to kgpound to kilogram °C to °Fdegree Celsius to degree Fahrenheit °F to °Cdegree Fahrenheit to degree Celsius mi to kmmile to kilometre km to mikilometre to mile ft² to m²square foot to square metre m² to ft²square metre to square foot MB to GBmegabyte to gigabyte GB to MBgigabyte to megabyte L to US gallitre to US gallon US gal to LUS gallon to litre mL to US cupmillilitre to US cup US cup to mLUS cup to millilitre US tbsp to US cupUS tablespoon to US cup US tsp to US tbspUS teaspoon to US tablespoon US cup to US tbspUS cup to US tablespoon oz to gounce to gram g to ozgram to ounce km/h to mphkilometre per hour to mile per hour mph to km/hmile per hour to kilometre per hour

Cooking calculators and convertersScale recipes and convert common metric and US customary kitchen measurements.Travel calculatorsEstimate journey time, fuel use, cost, distance, speed and running pace.Health calculatorsExplore conservative informational estimates for adult body size, energy needs, hydration and fitness.