Length Converter
Convert metric, Imperial and nautical lengths.
Open converter →Unit Converters
Convert everyday metric, Imperial, US customary, scientific and digital units instantly. Every calculation runs locally in your browser.
Weight and Mass Converter
Convert common metric, US and Imperial mass units.
Open converter →Temperature Converter
Convert Celsius, Fahrenheit and Kelvin with absolute-zero validation.
Open converter →Volume Converter
Convert metric, cubic, US customary and Imperial volumes without mixing standards.
Open converter →Area Converter
Convert metric, Imperial and land-area units.
Open converter →Speed Converter
Convert road, marine and scientific speed units.
Open converter →Cooking Measurement Converter
Convert explicitly labelled metric, US and Imperial cooking volumes.
Open converter →Data Storage Converter
Convert decimal SI and binary IEC data units with bits and bytes clearly distinguished.
Open converter →Time Converter
Convert precise durations and clearly labelled calendar averages.
Open converter →Pressure Converter
Convert SI, atmospheric and common pressure units.
Open converter →Energy Converter
Convert mechanical, electrical, thermal and particle energy units.
Open converter →Power Converter
Convert electrical, mechanical and heating power units.
Open converter →Fuel Economy Converter
Convert reciprocal consumption and efficiency units safely.
Open converter →Angle Converter
Convert degrees, radians, gradians and subdivisions of a circle.
Open converter →Popular conversions
Centimetre to Inch ConverterInch to Centimetre ConverterKilogram to Pound ConverterPound to Kilogram ConverterCelsius to Fahrenheit ConverterFahrenheit to Celsius ConverterInternational mile to Kilometre ConverterKilometre to International mile ConverterLitre to US gallon ConverterUS gallon to Litre ConverterMiles per hour to Kilometres per hour ConverterKilometres per hour to Miles per hour ConverterSquare metre to Square foot ConverterUS cup to Millilitre ConverterMegabyte to Gigabyte ConverterPound per square inch to Bar Converter
Browse conversion pairs by category
Length
Centimetre to Inch ConverterInch to Centimetre ConverterMillimetre to Inch ConverterInch to Millimetre ConverterMetre to Foot ConverterFoot to Metre ConverterMetre to Inch ConverterInch to Metre ConverterKilometre to International mile ConverterInternational mile to Kilometre ConverterFoot to Centimetre ConverterCentimetre to Foot ConverterFoot to Inch ConverterInch to Foot ConverterYard to Metre ConverterMetre to Yard ConverterKilometre to Metre ConverterMetre to Kilometre Converter
Weight
Kilogram to Pound ConverterPound to Kilogram ConverterGram to Ounce ConverterOunce to Gram ConverterKilogram to Stone ConverterStone to Kilogram ConverterStone to Pound ConverterPound to Stone ConverterPound to Ounce ConverterOunce to Pound ConverterGram to Pound ConverterPound to Gram ConverterKilogram to Gram ConverterGram to Kilogram ConverterMetric tonne to Kilogram ConverterKilogram to Metric tonne Converter
Temperature
Volume
Litre to US gallon ConverterUS gallon to Litre ConverterLitre to Imperial gallon ConverterImperial gallon to Litre ConverterMillilitre to Litre ConverterLitre to Millilitre ConverterMillilitre to US fluid ounce ConverterUS fluid ounce to Millilitre ConverterUS cup to Millilitre ConverterMillilitre to US cup ConverterUS pint to Litre ConverterLitre to US pint ConverterImperial pint to Litre ConverterLitre to Imperial pint ConverterUS quart to Litre ConverterLitre to US quart ConverterImperial quart to Litre ConverterLitre to Imperial quart ConverterCubic metre to Litre ConverterLitre to Cubic metre Converter
Area
Square metre to Square foot ConverterSquare foot to Square metre ConverterAcre to Square metre ConverterSquare metre to Acre ConverterAcre to Hectare ConverterHectare to Acre ConverterSquare kilometre to Square mile ConverterSquare mile to Square kilometre ConverterSquare foot to Acre ConverterAcre to Square foot Converter
Speed
Miles per hour to Kilometres per hour ConverterKilometres per hour to Miles per hour ConverterMetres per second to Kilometres per hour ConverterKilometres per hour to Metres per second ConverterMetres per second to Miles per hour ConverterMiles per hour to Metres per second ConverterKnot to Miles per hour ConverterMiles per hour to Knot ConverterKnot to Kilometres per hour ConverterKilometres per hour to Knot Converter
Cooking
Cooking US cup to Millilitre ConverterCooking Millilitre to US cup ConverterCooking US tablespoon to Millilitre ConverterCooking Millilitre to US tablespoon ConverterCooking US teaspoon to Millilitre ConverterCooking Millilitre to US teaspoon ConverterCooking US cup to US tablespoon ConverterCooking US tablespoon to US cup ConverterCooking US fluid ounce to US cup ConverterCooking US cup to US fluid ounce ConverterCooking Celsius to Fahrenheit ConverterCooking Fahrenheit to Celsius Converter
Data storage
Time
Minute to Hour ConverterHour to Minute ConverterSecond to Minute ConverterMinute to Second ConverterHour to Second ConverterSecond to Hour ConverterDay to Hour ConverterHour to Day ConverterWeek to Day ConverterDay to Week ConverterDay to Average month ConverterAverage month to Day ConverterAverage Gregorian year to Day ConverterDay to Average Gregorian year Converter
Pressure
Pound per square inch to Bar ConverterBar to Pound per square inch ConverterKilopascal to Pound per square inch ConverterPound per square inch to Kilopascal ConverterBar to Kilopascal ConverterKilopascal to Bar ConverterStandard atmosphere to Bar ConverterBar to Standard atmosphere ConverterMillimetre of mercury to Kilopascal ConverterKilopascal to Millimetre of mercury Converter
Energy
Joule to Small calorie ConverterSmall calorie to Joule ConverterKilojoule to Small calorie ConverterSmall calorie to Kilojoule ConverterKilojoule to Dietary kilocalorie / food Calorie ConverterDietary kilocalorie / food Calorie to Kilojoule ConverterKilowatt-hour to Joule ConverterJoule to Kilowatt-hour ConverterBritish thermal unit (IT) to Kilowatt-hour ConverterKilowatt-hour to British thermal unit (IT) Converter
Power
Fuel economy
Miles per US gallon to Litres per 100 kilometres ConverterLitres per 100 kilometres to Miles per US gallon ConverterMiles per Imperial gallon to Litres per 100 kilometres ConverterLitres per 100 kilometres to Miles per Imperial gallon ConverterKilometres per litre to Miles per US gallon ConverterMiles per US gallon to Kilometres per litre ConverterKilometres per litre to Litres per 100 kilometres ConverterLitres per 100 kilometres to Kilometres per litre Converter
Angle
Metric, Imperial and US customary systems
Metric units scale consistently by powers of ten. Imperial and US customary units share some names but not always the same size: a US gallon and an Imperial gallon are different, so this site labels each one explicitly.
Conversion accuracy
Calculations use numbers and authoritative definitions such as 1 inch = 2.54 centimetres and 1 pound = 0.45359237 kilograms. Formatting happens after calculation to remove floating-point noise while preserving useful precision. Average months, Mach and ingredient densities are labelled as approximations.
Frequently asked questions
Are US and Imperial units treated as equivalent?
No. US and Imperial gallons, pints and fluid ounces use separate labels and factors.
What is the difference between kB and KiB?
A decimal kilobyte (kB) is 1,000 bytes. A binary kibibyte (KiB) is 1,024 bytes.
How accurate are the results?
The engine uses exact defined constants where available and rounds only the displayed result. Approximate assumptions such as Mach, average months and ingredient density are clearly labelled.
Are conversion values uploaded?
No. Interactive conversions run locally in your browser.
Related tools
For calendar-aware calculations, see the Date Difference Calculator. For working-time totals, see the Decimal Hours Calculator.