Common Converters
Length, weight, volume, temperature, speed and other everyday units
Length Converter
Convert between metric and imperial lengths — meters, kilometers, centimeters, inches, feet, yards, miles and nautical miles — plus survey, astronomical and historical units.
92 unitsWeight and Mass Converter
Convert weight and mass between kilograms, grams, pounds, ounces, stones and tons (metric, short and long), plus troy, apothecary, atomic and historical units.
69 unitsVolume Converter
Convert volume and capacity between liters, milliliters, cubic meters, gallons (US and UK), quarts, pints, cups, fluid ounces, tablespoons and teaspoons — plus barrels, cubic feet and more.
76 unitsArea Converter
Convert area between square meters, square kilometers, hectares, acres, square feet, square inches, square yards and square miles — plus land and survey units like rods, sections and townships.
39 unitsTemperature Converter
Convert temperatures between Celsius, Fahrenheit, kelvin, Rankine and Réaumur — exact formulas with offsets, so 0 °C is 32 °F and 273.15 K.
6 unitsSpeed Converter
Convert speed between kilometers per hour, miles per hour, meters per second, feet per second and knots — plus Mach, the speed of light and other reference speeds.
32 unitsTime Converter
Convert time between seconds, minutes, hours, days, weeks, months, years, decades and centuries — plus milliseconds and other tiny units, and sidereal and astronomical time.
33 unitsEnergy Converter
Convert energy between joules, kilojoules, calories, kilocalories, kilowatt-hours, BTUs, electron-volts and therms — plus foot-pounds, TNT equivalents and atomic units.
54 unitsPower Converter
Convert power between watts, kilowatts, megawatts, horsepower (mechanical, metric, electric and boiler), BTU per hour, calories per second and refrigeration tons.
76 unitsPressure Converter
Convert pressure between pascals, kilopascals, bar, psi, atmospheres, torr and mmHg — plus inches of mercury and water, kgf/cm² and ton-force units.
52 unitsForce Converter
Convert force between newtons, kilonewtons, pounds-force, kilograms-force, dynes, poundals and ton-force (short, long and metric).
33 unitsAngle Converter
Convert angles between degrees, radians, gradians (gons), arcminutes, arcseconds, turns and mils.
14 unitsData Storage Converter
Convert digital storage between bits, bytes, kilobytes, megabytes, gigabytes, terabytes and petabytes — in both binary (1024) and decimal (1000) units — plus disks and words.
41 unitsVolume - Dry Converter
Convert dry volume between liters, bushels, pecks, dry quarts and dry pints (US and UK) — plus dry barrels and Biblical dry measures.
15 unitsFuel Consumption Converter
Convert fuel economy between liters per 100 km, miles per gallon (US and UK), kilometers per liter and gallons per 100 miles — reciprocal units are converted correctly.
37 unitsNumbers Converter
Convert numbers between binary, octal, decimal, hexadecimal and every base from 2 to 36 — exact for whole numbers of any size.
39 unitsEngineering Converters
Torque, density, acceleration and other engineering units
Velocity - Angular Converter
Convert angular velocity between revolutions per minute (RPM), revolutions per second, radians per second and degrees per second, minute, hour or day.
12 unitsAcceleration Converter
Convert acceleration between meters per second squared, feet per second squared, g-force (standard gravity) and gals.
19 unitsAcceleration - Angular Converter
Convert angular acceleration between radians per second squared, radians per minute squared and revolutions per second or minute squared.
5 unitsDensity Converter
Convert density between kilograms per cubic meter, grams per cubic centimeter, grams per liter, pounds per cubic foot, pounds per gallon and more.
42 unitsSpecific Volume Converter
Convert specific volume (the inverse of density) between cubic meters per kilogram, liters per kilogram, cubic feet per pound and gallons per pound.
8 unitsMoment of Inertia Converter
Convert rotational inertia between kilogram square meters, gram square centimeters, pound square feet, slug square feet and force-based units.
14 unitsMoment of Force Converter
Convert moment of force between newton meters, kilonewton meters, kilogram-force meters, pound-force feet, poundal feet and ton-force meters.
12 unitsTorque Converter
Convert torque between newton meters, newton centimeters, kilogram-force meters, pound-force feet, pound-force inches, ounce-force inches and dyne units.
17 unitsRadiology Converters
Radiation dose, dose rate, activity and exposure units
Radiation Converter
Convert absorbed dose rate between grays per second (and all SI prefixes), rads per second, rems per second, sieverts per second and watts per kilogram.
22 unitsRadiation-Absorbed Dose Converter
Convert absorbed radiation dose between grays, milligrays, rads, millirads and joules per kilogram, gram, centigram or milligram.
23 unitsRadiation-Activity Converter
Convert radioactivity between becquerels, kilobecquerels, megabecquerels, curies, millicuries, microcuries, picocuries and rutherfords.
16 unitsRadiation-Exposure Converter
Convert radiation exposure between roentgens, coulombs per kilogram (and milli/micro), parkers, reps and tissue roentgens.
7 unitsLight Converters
Illumination, luminance, frequency and image resolution
Illumination Converter
Convert illuminance between lux, foot-candles, phots, nox and lumens per square meter, foot or centimeter.
12 unitsLuminance Converter
Convert luminance (brightness) between candelas per square meter (nits), foot-lamberts, lamberts, stilbs, apostilbs and candelas per square foot or inch.
19 unitsLuminous Intensity Converter
Convert luminous intensity between candelas (lumens per steradian), international, UK and German candles, Hefner candles, carcel units and bougies.
10 unitsDigital Image Resolution Converter
Convert print and screen resolution between dots per inch (DPI), pixels per inch (PPI), dots per millimeter and dots per meter.
4 unitsFrequency Wavelength Converter
Convert between frequency (hertz to exahertz) and electromagnetic wavelength (nanometres to kilometres) using λ = c / f, plus Compton wavelengths.
35 unitsMagnetism Converters
Magnetic flux, flux density, field strength and MMF
Magnetomotive Force Converter
Convert magnetomotive force between ampere-turns, kiloampere-turns, milliampere-turns, abampere-turns and gilberts.
5 unitsMagnetic Field Strength Converter
Convert magnetic field strength (H) between amperes per meter, kiloamperes per meter, ampere-turns per meter and oersteds.
4 unitsMagnetic Flux Converter
Convert magnetic flux between webers, milliwebers, microwebers, maxwells, lines, tesla square meters and the magnetic flux quantum.
13 unitsMagnetic Flux Density Converter
Convert magnetic flux density (B) between teslas, gauss, gammas, webers per square meter and maxwells or lines per square centimeter or inch.
11 unitsFluids Converters
Flow, viscosity, concentration and surface tension
Concentration - Solution Converter
Convert solution concentration between milligrams per liter, grams per liter, parts per million (ppm, water) and pounds or grains per gallon.
11 unitsConcentration - Molar Converter
Convert molar concentration (molarity) between moles per liter (M), millimoles per liter (mM) and moles or kilomoles per cubic meter, centimeter or millimeter.
12 unitsFlow Converter
Convert volumetric flow rate between liters per second, minute or hour, cubic meters per hour, gallons per minute (GPM), cubic feet per minute (CFM), barrels per day and more.
58 unitsFlow - Mass Converter
Convert mass flow rate between kilograms per second, minute, hour or day, grams, milligrams, pounds and metric or short tons per hour.
31 unitsFlow - Molar Converter
Convert molar flow rate between moles per second (with every SI prefix) and moles, millimoles or kilomoles per minute, hour or day.
26 unitsMass Flux Density Converter
Convert mass flux (mass flow per unit area) between kilograms per second or hour per square meter, grams per second per square centimeter and pounds per square foot.
7 unitsViscosity - Dynamic Converter
Convert dynamic (absolute) viscosity between pascal seconds, poise, centipoise (and every SI prefix), and imperial units like pound-force second per square foot.
29 unitsViscosity - Kinematic Converter
Convert kinematic viscosity between square meters per second, stokes and centistokes (with every SI prefix), and square feet or inches per second.
24 unitsSurface Tension Converter
Convert surface tension between newtons per meter, millinewtons per meter, dynes per centimeter, ergs per square centimeter and pound-force per inch.
8 unitsPermeability Converter
Convert water-vapor permeance between perms (at 0 °C and 23 °C), perm-inches and the SI unit kilograms per pascal second square meter.
5 unitsHeat Converters
Heat, temperature intervals, conductivity and fuel energy
Temperature Interval Converter
Convert temperature differences — not temperatures — between kelvins, degrees Celsius, Fahrenheit, Rankine and Réaumur (no offsets: a 1 °C change is a 1.8 °F change).
6 unitsThermal Expansion Converter
Convert coefficients of thermal expansion between per kelvin (per °C), per °F, per °R and per Réaumur degree.
5 unitsSpecific Heat Capacity Converter
Convert specific heat capacity between joules per kilogram kelvin, kilojoules per kilogram kelvin, calories per gram °C and BTUs per pound °F.
20 unitsHeat Density Converter
Convert heat (energy) per area between joules per square meter, langleys, calories per square centimeter and BTUs per square foot.
5 unitsHeat Flux Density Converter
Convert heat flux (power per area) between watts per square meter or centimeter, kilowatts per square meter, BTUs per hour per square foot and calories per square centimeter.
26 unitsHeat Transfer Coefficient Converter
Convert heat transfer coefficients (U-values) between watts per square meter kelvin, kilocalories per hour per square meter °C and BTUs per hour per square foot °F.
11 unitsThermal Conductivity Converter
Convert thermal conductivity between watts per meter kelvin, kilocalories per hour meter °C and BTU·in or BTU·ft per hour square foot °F.
13 unitsThermal Resistance Converter
Convert thermal resistance between kelvins per watt and degrees Fahrenheit hour or second per BTU (IT and thermochemical).
5 unitsFuel Efficiency - Mass Converter
Convert fuel energy per mass (specific energy) and its inverse — joules per kilogram, BTUs per pound, calories per gram, grams per kilowatt-hour and pounds per horsepower-hour.
15 unitsFuel Efficiency - Volume Converter
Convert fuel energy per volume (energy density) and its inverse — joules per liter or cubic meter, BTUs per cubic foot, therms per gallon and gallons per horsepower-hour.
14 unitsElectricity Converters
Charge, voltage, resistance, capacitance and current units
Charge Converter
Convert electric charge between coulombs, millicoulombs, ampere-hours, ampere-minutes, faradays, elementary charges, abcoulombs and statcoulombs.
17 unitsElectric Potential Converter
Convert electric potential (voltage) between volts, watts per ampere, statvolts and abvolts (ESU and EMU units).
6 unitsElectric Resistance Converter
Convert electrical resistance between ohms, megohms, microhms, volts per ampere, abohms, statohms and the quantized Hall resistance.
10 unitsElectric Conductance Converter
Convert electrical conductance between siemens, millisiemens, microsiemens, mhos, amperes per volt, abmhos and statmhos.
12 unitsElectrostatic Capacitance
Convert capacitance between farads, microfarads, nanofarads, picofarads (and every SI prefix), coulombs per volt, abfarads and statfarads.
22 unitsInductance Converter
Convert inductance between henries, millihenries, microhenries, nanohenries (and every SI prefix), webers per ampere, abhenries and stathenries.
22 unitsElectric Field Strength Converter
Convert electric field strength between volts per meter, kilovolts per meter or centimeter, volts per inch or mil, newtons per coulomb, statvolts and abvolts per centimeter.
13 unitsElectric Resistivity Converter
Convert electrical resistivity between ohm meters, ohm centimeters, ohm inches, microhm centimeters, circular mil ohms per foot and CGS units.
8 unitsElectric Conductivity Converter
Convert electrical conductivity between siemens per meter, picosiemens per meter, mhos per meter or centimeter, abmhos and statmhos.
8 unitsSurface Charge Density Converter
Convert surface charge density between coulombs per square meter, centimeter or inch and abcoulombs per square meter, centimeter or inch.
6 unitsVolume Charge Density Converter
Convert volume charge density between coulombs per cubic meter, centimeter or inch and abcoulombs per cubic meter, centimeter or inch.
6 unitsLinear Charge Density Converter
Convert linear charge density between coulombs per meter, centimeter or inch and abcoulombs per meter, centimeter or inch.
6 unitsLinear Current Density Converter
Convert linear current density between amperes per meter, centimeter or inch, abamperes per meter, centimeter or inch, gilberts per centimeter and oersteds.
8 unitsSurface Current Density Converter
Convert current density between amperes per square meter, centimeter, inch, mil or circular mil and abamperes per square centimeter.
6 unitsMost Popular Unit Conversions
Every Unit, One Place
House of Convert's unit converters cover everyday measurements like length, weight, volume and temperature, plus the specialist units engineers, scientists and students run into: torque and moment of inertia, radiation dose and activity, luminance and illuminance, magnetic flux, viscosity and permeability, heat transfer coefficients, and the full set of SI, CGS and imperial electrical units. Type a value and the answer appears as you type — or open the "All conversions" table to see it in every unit at once.
Frequently Asked Questions
Are the unit converters free?
Yes. All 71 converters are free to use with no sign-up and no limits.
Where do the conversion factors come from?
Factors use exact SI definitions where they exist (the international foot, pound, calorie and Btu, for example) and published standard values everywhere else. Every factor in the site was cross-checked against an independent reference table.
Is my data sent anywhere?
No. Once a converter page has loaded, every calculation happens in your browser.