Unit Converters - Temperature, Length, Weight & More

Unit Converters

Fast, exact converters for temperature, length, weight, area, volume, speed, time and data units, plus science and file format tools. Type a number and get the answer instantly.

159 convertersExact conversion factors0 sign-up needed

Temperature

7 tools

Convert between Celsius, Fahrenheit and Kelvin, or open the full temperature set.

All Temperature ConvertersEvery C, F, K and Rankine pair Celsius to FahrenheitThe everyday C to F conversion Fahrenheit to KelvinF to K for science work Kelvin to FahrenheitK back to F, instantly Celsius to KelvinConvert Celsius into Kelvin Fahrenheit to CelsiusConvert Fahrenheit into Celsius Kelvin to CelsiusConvert Kelvin into Celsius

Length and Distance

26 tools

Metric and imperial length conversions, from millimetres to miles.

Length ConverterMetres, feet, miles, inches Inches to MetersInches to metres Inches to YardsInches to yards Inches to mmInches back to millimetres Meters to MilesMetres to miles Meters to YardsMetres to yards Yards to MilesYards to miles cm to InchesCentimetres to inches cm to kmCentimetres to kilometres km to MilesKilometres to miles mm to InchesMillimetres to inches mm to cmMillimetres to centimetres mm to kmMillimetres to kilometres Centimeters to YardsConvert Centimeters into Yards Feet to InchesConvert Feet into Inches Feet to YardsConvert Feet into Yards Feet to cmConvert Feet into cm Inches to cmConvert Inches into cm Meters to InchesConvert Meters into Inches Meters to cmConvert Meters into cm Miles to KmConvert Miles into Km Yards to CentimetersConvert Yards into Centimeters Yards to MetersConvert Yards into Meters cm to FeetConvert cm into Feet cm to MetersConvert cm into Meters cm to mmConvert cm into mm

Weight and Mass

17 tools

Convert between grams, kilograms and specialist units, or open the full weight set.

All Weight ConvertersEvery gram, kg and pound pair Carat to KilogramGem carats to kilograms Microgram to KilogramMicrograms to kilograms Grams to OuncesConvert Grams into Ounces Grams to kgConvert Grams into kg Kg to StoneConvert Kg into Stone Kilograms to OuncesConvert Kilograms into Ounces Kilograms to PoundsConvert Kilograms into Pounds Ounces to GramsConvert Ounces into Grams Ounces to KilogramsConvert Ounces into Kilograms Ounces to PoundsConvert Ounces into Pounds Pounds to KilogramsConvert Pounds into Kilograms Pounds to OuncesConvert Pounds into Ounces Pounds to StoneConvert Pounds into Stone Stone to KgConvert Stone into Kg Stone to PoundsConvert Stone into Pounds kg to GramsConvert kg into Grams

Metric and Imperial Systems

4 tools

Switch a value between the metric and imperial systems in one step.

Imperial to MetricConvert imperial units to metric Metric ConverterA general metric-unit converter Metric to ImperialConvert metric units to imperial Shoe Size ConverterUS, UK and EU shoe sizes

Data and File Formats

10 tools

Quick format converters for documents and structured data.

Data Storage ConverterEvery data storage unit in one tool Data Transfer Rate ConverterMbps, MB/s and Gbps HTML to ExcelExtract HTML tables to a spreadsheet HTML to PDFTurn an HTML page into a PDF JSON to XMLConvert JSON into XML XML to CSVFlatten XML into CSV rows XML to HTMLRender XML as an HTML table XML to JSONConvert XML into JSON GB to MBConvert GB into MB MB to GBConvert MB into GB

Numbers and Notation

7 tools

Convert between number formats: Roman numerals, words and bases.

ASCII ConverterText to character codes Base ConverterDecimal, binary, octal and hex Hex to RGB ConverterWeb colour hex, RGB and HSL Number to Words ConverterWrite a number in words Roman Numeral ConverterNumbers to Roman numerals and back Typography Converterpx, pt, em, rem and pc Unix Timestamp ConverterEpoch time to a UTC date

Science and Motoring

21 tools

Pressure, energy and fuel-economy unit conversions.

Acceleration Converterm/s2, g-force and ft/s2 Angle ConverterDegrees, radians and gradians Density Converterkg/m3, g/cm3 and lb/ft3 Energy ConverterJoules, calories, kWh and BTU Flow Rate ConverterL/s, GPM, CFM and m3/h Force ConverterNewtons, lbf, kgf and dyne Frequency ConverterHz, kHz, MHz, GHz and rpm Fuel Economy ConverterMPG, L/100km and km/L Illuminance ConverterLux, foot-candles and phot Luminance ConverterNit, stilb and foot-lambert Magnetic Field ConverterTesla, gauss and mT Power ConverterWatts, horsepower and BTU/h Pressure ConverterPa, bar, psi, atm and mmHg Torque ConverterNm, lb-ft and kgf-m Viscosity ConverterPa.s, poise and centipoise Bar to PSIConvert Bar into PSI Calories to kJConvert Calories into kJ Kilowatts to WattsConvert Kilowatts into Watts PSI to BarConvert PSI into Bar Watts to KilowattsConvert Watts into Kilowatts kJ to CaloriesConvert kJ into Calories

Area and Land

7 tools

Square feet, square meters, acres, hectares, marla and kanal.

Area ConverterEvery area unit in one tool Acres to Square FeetConvert Acres into Square Feet Marla to Square FeetConvert Marla into Square Feet Square Feet to AcresConvert Square Feet into Acres Square Feet to MarlaConvert Square Feet into Marla Square Feet to Square MetersConvert Square Feet into Square Meters Square Meters to Square FeetConvert Square Meters into Square Feet

Volume and Cooking

11 tools

Liters, gallons, milliliters, cups, fluid ounces and spoons.

Volume ConverterEvery volume unit in one tool Cups to mLConvert Cups into mL Fluid Ounces to MillilitersConvert Fluid Ounces into Milliliters Gallons to LitersConvert Gallons into Liters Liters to GallonsConvert Liters into Gallons Liters to mLConvert Liters into mL Tablespoons to TeaspoonsConvert Tablespoons into Teaspoons Teaspoons to TablespoonsConvert Teaspoons into Tablespoons mL to CupsConvert mL into Cups mL to Fluid OuncesConvert mL into Fluid Ounces mL to LitersConvert mL into Liters

Time and Duration

42 tools

Seconds, minutes, hours, days, weeks, months and years.

Days to HoursConvert Days into Hours Days to MinutesConvert Days into Minutes Days to MonthsConvert Days into Months Days to SecondsConvert Days into Seconds Days to WeeksConvert Days into Weeks Days to YearsConvert Days into Years Hours to DaysConvert Hours into Days Hours to MinutesConvert Hours into Minutes Hours to MonthsConvert Hours into Months Hours to SecondsConvert Hours into Seconds Hours to WeeksConvert Hours into Weeks Hours to YearsConvert Hours into Years Minutes to DaysConvert Minutes into Days Minutes to HoursConvert Minutes into Hours Minutes to MonthsConvert Minutes into Months Minutes to SecondsConvert Minutes into Seconds Minutes to WeeksConvert Minutes into Weeks Minutes to YearsConvert Minutes into Years Months to DaysConvert Months into Days Months to HoursConvert Months into Hours Months to MinutesConvert Months into Minutes Months to SecondsConvert Months into Seconds Months to WeeksConvert Months into Weeks Months to YearsConvert Months into Years Seconds to DaysConvert Seconds into Days Seconds to HoursConvert Seconds into Hours Seconds to MinutesConvert Seconds into Minutes Seconds to MonthsConvert Seconds into Months Seconds to WeeksConvert Seconds into Weeks Seconds to YearsConvert Seconds into Years Weeks to DaysConvert Weeks into Days Weeks to HoursConvert Weeks into Hours Weeks to MinutesConvert Weeks into Minutes Weeks to MonthsConvert Weeks into Months Weeks to SecondsConvert Weeks into Seconds Weeks to YearsConvert Weeks into Years Years to DaysConvert Years into Days Years to HoursConvert Years into Hours Years to MinutesConvert Years into Minutes Years to MonthsConvert Years into Months Years to SecondsConvert Years into Seconds Years to WeeksConvert Years into Weeks

Speed

7 tools

km/h, mph, meters per second and knots.

Speed ConverterEvery speed unit in one tool Knots to mphConvert Knots into mph km/h to mphConvert km/h into mph m/s to mphConvert m/s into mph mph to KnotsConvert mph into Knots mph to km/hConvert mph into km/h mph to m/sConvert mph into m/s

One place for every conversion

A good converter should do one thing perfectly: take your number and return the exact equivalent in another unit, with no clutter and no waiting. This hub collects our most-used converters so you can jump straight to the pair you need, whether that is centimetres to inches for a measurement, Celsius to Fahrenheit for a recipe, or XML to JSON for a bit of data wrangling.

Metric and imperial in one step

If you regularly move between systems, the metric to imperial and imperial to metric tools handle whole categories at once, while the single-unit converters above are quickest when you know exactly which pair you want. Every category also has its own all-in-one page, including length, weight, area, volume, speed and data storage, where you can pick any two units.

Accurate by design

Each converter uses the internationally defined factor for its units, so the result is exact rather than rounded guesswork. Everything runs in your browser, so your numbers stay on your device and nothing is stored.

Frequently asked questions

Are the conversions exact?

Yes. Each converter uses the standard, internationally defined factor for its units, so the output is mathematically exact. We only round the display for readability, and you can usually see extra decimal places.

Do I need to install anything?

No. Every converter runs in your browser, works on phone and desktop, and needs no download, plugin or sign-up.

Where are the full lists for each category?

Each group starts with an all-in-one category converter, such as the Area, Volume, Speed and Data Storage converters, where you can choose any pair of units in that group.

Can I convert data formats like XML and JSON here too?

Yes. The Data and File Formats section converts between XML, JSON, CSV, HTML and more, so you can reshape structured data without leaving the site.

Can I convert time units like days to hours?

Yes. The Time and Duration section converts between seconds, minutes, hours, days, weeks, months and years. Months and years use average lengths, so use a date calculator for exact calendar dates.

Reviewed by Prof. Dr. Khalil Mudassar, PhD
Formulas and conversion factors on this page are checked for accuracy against standard references. View profile

These converters are provided for general use. Results use standard conversion factors and the value you enter. For engineering, legal, medical or trade purposes where precision is critical, confirm the figure against an authoritative reference.

Creator

Shakeel Muzaffar

Founder & Editor-in-Chief at MultiCalculators ~ Web ~ More Posts

Shakeel Muzaffar is the Founder and Editor-in-Chief of MultiCalculators.com, bringing over 15 years of experience in digital publishing, product strategy, and online tool development. He leads the platform's editorial vision, ensuring every calculator meets strict standards for accuracy, usability, and real-world value. Shakeel personally oversees content quality, formula verification workflows, and the platform's commitment to publishing tools that are genuinely useful for students, professionals, and everyday users worldwide.

Areas of Expertise: Editorial Leadership, Digital Publishing, Product Strategy, Online Calculators, Web Standards