Online Unit Converter

This online Unit Conversion page allows quick and accurate conversion between many units of measure, from one system to another. The Unit Conversion page provides a solution for anyone whose activities require working with quantities measured in different units.

You can use this online converter to convert between more than 250 units (including metric, British and American) in 19 categories, or 4300 pairs including acceleration, area, electrical, energy, force, length, light, mass, mass flow, density, mass capacity, power, pressure, stress, temperature, time, torque, velocity, viscosity, volume and capacity, volume flow, and more (full list of units is at the bottom of the page).

To convert a value, select a category from the Category menu.

The options in the A and B menus are automatically updated to the supported units of the selected category. Select units in A and B menus, enter a number to be converted into the upper field and click the Convert to B button. The converted value will appear in the lower field. You can also enter a value into the lower field and click the Convert to A button.

On the next page you will find a number of conversion factors that can be used to convert between many units of measurement. Some of them are from a previous era and are rarely used today. However, they are interesting and useful if you read or translate old publications. You will be able to convert units of avoirdupois weight system (drams, stones, hundredweights) utilized by the United States and England for measuring commodities except precious metals, precious stones and medicines, the troy weight system (grains, pennyweights) that is used mainly for weighing precious metals and gems, apothecaries' weight system (grains, scruples, drams), now virtually unused since the metric system is used for all scientific purposes, and some other units used for measuring distance, square, volume and power.

Click here to go to Tables of Weights and Measures

Online Unit Converters and Calculators from unitconversion.org

Frequently Used Converters

Length meter, kilometer, hectometer, dekameter, decimeter, centimeter, millimeter ...

Mass kilogram, gram, centigram, milligram, microgram ...

Volume - Dry liter, barrel dry, pint dry, quart dry, peck, bushel, cor, homer, ...

Area meter², kilometer², hectometer², dekameter², decimeter², centimeter², millimeter², micrometer², nanometer², hectare, are ...

Temperature kelvin, degree Celsius, degree Fahrenheit, degree Rankine, degree Reaumur, Triple point of water

Pressure pascal, exapascal, petapascal, terapascal, gigapascal, megapascal, kilopascal, hectopascal, dekapascal, decipascal, centipascal ...

Energy joule, gigajoule, megajoule, kilojoule, millijoule, microjoule, nanojoule, attojoule, megaelectron-volt, kiloelectron-volt ...

Power watt, exawatt, petawatt, terawatt, gigawatt, megawatt, kilowatt, hectowatt, dekawatt, deciwatt, centiwatt, milliwatt, microwatt ...

Force newton, exanewton, petanewton, teranewton, giganewton, meganewton, kilonewton, hectonewton, dekanewton, decinewton, centinewton ...

Time second, millisecond, microsecond, nanosecond, picosecond, femtosecond, attosecond, shake, minute, hour, day, week, month, year ...

Velocity meter/second, meter/hour, meter/minute, kilometer/hour, kilometer/minute, kilometer/second, centimeter/hour, centimeter/minute ...

Angle degree, radian, grad, gon, minute, second, sign, mil, revolution, circle, turn, quadrant, right angle, sextant

Fuel Consumption meter/liter, exameter/liter, petameter/liter, terameter/liter, gigameter/liter, megameter/liter, kilometer/liter, hectometer/liter ...

Numbers binary, octal, decimal, hexadecimal, base-2, base-3, base-4, base-5, base-6, base-7, base-8, base-9, base-10, base-11, base-12 ...

Data Storage bit, nibble, byte, character, word, MAPM-word, quadruple-word, block, kilobit, kilobyte, megabit, megabyte, gigabit, gigabyte ...

Mechanical Converters

Velocity - Angular radian/second, radian/day, radian/hour, radian/minute, degree/day, degree/hour, degree/minute, degree/second, revolution/day ...

Acceleration decimeter/second², meter/second², kilometer/second², hectometer/second², dekameter/second², centimeter/second² ...

Acceleration - Angular radian/second², radian/minute², revolution/second², revolution/minute/second, revolution/minute²

Density kilogram/meter³, kilogram/centimeter³, gram/meter³, gram/centimeter³, gram/millimeter³, milligram/meter³ ...

Specific Volume meter³/kilogramm, centimeter³/gram, liter/kilogram, liter/gram, foot³/kilogram, foot³/pound, gallon/pound ...

Moment of Inertia kilogram meter², kilogram centimeter², kilogram millimeter², gram centimeter², gram millimeter² ...

Moment of Force newton meter, kilonewton meter, millinewton meter, micronewton meter, ton-force meter, kilogram-force meter, gram-force centimeter ...

Torque newton meter, newton centimeter, newton millimeter, kilonewton meter, dyne meter, dyne centimeter, dyne millimeter ...

Heat Converters

Fuel Efficiency - Mass joule/kilogram, kilojoule/kilogram, calorie/gram, Btu/pound, kilogram/joule, kilogram/kilojoule, gram/calorie, pound/Btu ...

Fuel Efficiency - Volume joule/meter³, joule/liter, megajoule/meter³, kilojoule/meter³, kilocalorie/meter³, calorie/centimeter³, therm/foot³ ...

Temperature Interval kelvin, degree Celsius, degree centigrade, degree Fahrenheit, degree Rankine, degree Reaumur

Thermal Expansion length/lenght/kelvin, length/lenght/degree Celsius, length/lenght/degree Fahrenheit, length/lenght/degree Rankine ...

Thermal Resistance kelvin/watt, degree Fahrenheit hour/Btu, degree Fahrenheit second/Btu ...

Thermal Conductivity watt/meter/K, watt/centimeter/°C, kilowatt/meter/K, calorie/second/centimeter/°C, kilocalorie/hour/meter/°C ...

Specific Heat Capacity joule/kilogram/K, joule/kilogram/°C, joule/gram/°C, kilojoule/kilogram/K, kilojoule/kilogram/°C, calorie/gram/°C, calorie/gram/°F ...

Heat Density joule/meter², calorie/centimeter², langley, Btu/foot² ...

Heat Flux Density watt/meter², kilowatt/meter², watt/centimeter², watt/inch², joule/second/meter², kilocalorie/hour/meter² ...

Heat Transfer Coefficient watt/meter²/K, watt/meter²/°C, joule/second/meter²/K, calorie/second/centimeter²/°C, kilocalorie/hour/meter²/°C ...

Fluids Converters

Flow meter³/second, meter³/day, meter³/hour, meter³/minute, centimeter³/day, centimeter³/hour, centimeter³/minute ...

Flow - Mass kilogram/second, gram/second, gram/minute, gram/hour, gram/day, milligram/minute, milligram/hour, milligram/day, kilogram/minute ...

Flow - Molar mol/second, examol/second, petamol/second, teramol/second, gigamol/second, megamol/second, kilomol/second, hectomol/second ...

Mass Flux Density gram/second/meter², kilogram/hour/meter², kilogram/hour/foot², kilogram/second/meter², gram/second/centimeter² ...

Concentration - Molar mol/meter³, mol/liter, mol/centimeter³, mol/millimeter³, kilomol/meter³, kilomol/liter, kilomol/centimeter³ ...

Concentration - Solution kilogram/liter, gram/liter, milligram/liter, part/million, grain/gallon, pound/gallon, pound/million gallon, pound/foot³ ...

Viscosity - Dynamic pascal second, kilogram-force second/meter², newton second/meter², millinewton second/meter², dyne second/centimeter², poise ...

Viscosity - Kinematic meter²/second, meter²/hour, centimeter²/second, millimeter²/second, foot²/second, foot²/hour, inch²/second, stokes ...

Surface Tension newton/meter, millinewnon/meter, gram-force/centimeter, dyne/centimeter, erg/centimeter², erg/millimeter², poundal/inch ...

Permeability kilogram/pascal/second/meter², permeability, permeability inches ...

Sound Converters

Sound bel, decibel, neper

Light Converters

Luminance candela/meter², candela/centimeter², candela/foot², candela/inch², kilocandela/meter², stilb, lumen/meter²/steradian ...

Luminous Intensity candle, decimal candle, pentane candle, hefner candle, carcel unit, bougie decimal, lumen/steradian ...

Illumination lux, meter-candle, centimeter-candle, foot-candle, flame, phot, nox, candela steradian/meter², lumen/meter², lumen/centimeter² ...

Digital Image Resolution dot/meter, dot/millimeter, dot/inch, pixel/inch

Frequency Wavelength hertz, exahertz, petahertz, terahertz, gigahertz, megahertz, kilohertz, hectohertz, dekahertz, decihertz, centihertz, millihertz ...

Electricity Converters

Charge coulomb, megacoulomb, kilocoulomb, millicoulomb, microcoulomb, nanocoulomb, picocoulomb, abcoulomb, EMU of charge, statcoulomb ...

Linear Charge Density coulomb/meter, coulomb/centimeter, coulomb/inch, abcoulomb/meter, abcoulomb/centimeter, abcoulomb/inch

Surface Charge Density coulomb/meter², coulomb/centimeter², coulomb/inch², abcoulomb/meter², abcoulomb/centimeter², abcoulomb/inch²

Volume Charge Density coulomb/meter³, coulomb/centimeter³, coulomb/inch³, abcoulomb/meter³, abcoulomb/centimeter³, abcoulomb/inch³

Current ampere, kiloampere, milliampere, biot, abampere, EMU of current, statampere, ESU of current, CGS e.m. unit, CGS e.s. unit

Linear Current Density ampere/meter, ampere/centimeter, ampere/inch, abampere/meter, abampere/centimeter, abampere/inch, oersted, gilbert/centimeter

Surface Current Density ampere/meter², ampere/centimeter², ampere/inch², ampere/mil², ampere/cicular mil, abampere/centimeter²

Electric Field Strength volt/meter, kilovolt/meter, kilovolt/centimeter, volt/centimeter, millivolt/meter, microvolt/meter, kilovolt/inch, volt/inch ...

Electric Potential volt, watt/ampere, abvolt, EMU of electric potential, statvolt, ESU of electric potential

Electric Resistance ohm, megohm, microhm, volt/ampere, reciprocal siemens, abohm, EMU of resistance, statohm, ESU of resistance ...

Electric Resistivity ohm meter, ohm centimeter, ohm inch, microhm centimeter, microhm inch, abohm centimeter, statohm centimeter, circular mil ohm/foot

Electric Conductance siemens, megasiemens, kilosiemens, millisiemens, microsiemens, ampere/volt, mho, gemmho, micromho, abmho, statmho ...

Electric Conductivity siemens/meter, picosiemens/meter, mho/meter, mho/centimeter, abmho/meter, abmho/centimeter, statmho/meter, statmho/centimeter

Electrostatic Capacitance farad, exafarad, petafarad, terafarad, gigafarad, megafarad, kilofarad, hectofarad, dekafarad, decifarad, centifarad, millifarad ...

Inductance henry, exahenry, petahenry, terahenry, gigahenry, megahenry, kilohenry, hectohenry, dekahenry, decihenry, centihenry, millihenry ...

Magnetism Converters

Magnetomotive Force ampere turn, kiloampere turn, milliampere turn, abampere turn, gilbert

Magnetic Field Strength ampere/meter, ampere turn/meter, kiloampere/meter, oersted

Magnetic Flux weber, milliweber, microweber, volt second, unit pole, megaline, kiloline, line, maxwell, tesla meter², tesla centimeter² ...

Magnetic Flux Density tesla, weber/meter², weber/centimeter², weber/inch², maxwell/meter², maxwell/centimeter², maxwell/inch², gauss ...

Radiology Converters

Radiation gray/second, exagray/second, petagray/second, teragray/second, gigagray/second, megagray/second, kilogray/second, hectogray/second ...

Radiation - Activity becquerel, terabecquerel, gigabecquerel, megabecquerel, kilobecquerel, millibecquerel, curie, kilocurie, millicurie, microcurie ...

Radiation - Exposure coulomb/kilogram, millicoulomb/kilogram, microcoulomb/kilogram, roentgen, tissue roentgen, parker, rep

Radiation - Absorbed Dose rad, millirad, joule/kilogram, joule/gram, joule/centigram, joule/milligram, gray, exagray, petagray, teragray, gigagray, megagray ...

Miscellaneous Converters

Prefixes none, yotta, zetta, exa, peta, tera, giga, mega, kilo, hecto, deka, deci, centi, milli, micro, nano, pico, femto, atto, zepto ...

Data Transfer bit/second, byte/second, kilobit/second, kilobyte/second, megabit/second, megabyte/second, gigabit/second, gigabyte/second ...

Typography twip, meter, centimeter, millimeter, character, pixel, inch, pica, PostScript point, point, en ...

Volume - Lumber cubic meter, cubic foot, cubic inch, board feet, thousand board feet, cord, cord feet, cunit, pallet, cross tie, switch tie ...

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Page credits:
JS Unit Converter script written by Costas Malamas.
Unit Converters by unitconversion.org.