EVERYDAY · ENGINEERING · SCIENCE

Unit conversion. Made clear.

Start with a familiar unit, type a value, and get a dependable answer with sensible precision. Fractions and scientific notation are welcome.

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EVERYDAY

Length

Distance, height, thickness and astronomical length.

m
ft

Try a decimal, 1e-9, 1/3, or 5 1/2.

Result3.28084 ft1 m = 3.28084 ft
HOW IT IS CALCULATED

Convert through metre

Enter a metre value to calculate foot with full internal precision before display rounding.

Display PrecisionAuto · 6 significant digits

Auto trims unnecessary zeroes and uses scientific notation for extreme magnitudes. Use Digits to set the display precision; calculations retain full precision.

QUICK REFERENCE

All units in this quantity

UnitSymbolConverted value
quectometrefrom mqm1e30
rontometrefrom mrm1e27
yoctometrefrom mym1e24
zeptometrefrom mzm1e21
attometrefrom mam1e18
femtometrefrom mfm1000000000000000
picometrefrom mpm1000000000000
nanometrefrom mnm1000000000
ångströmfrom mÅ10000000000
micrometrefrom mµm1000000
millimetrefrom mmm1000
centimetrefrom mcm100
decimetrefrom mdm10
metrefrom mm1
decametrefrom mdam0.1
hectometrefrom mhm0.01
kilometrefrom mkm0.001
megametrefrom mMm0.000001
gigametrefrom mGm0.000000001
terametrefrom mTm1e-12
petametrefrom mPm1e-15
exametrefrom mEm1e-18
zettametrefrom mZm1e-21
yottametrefrom mYm1e-24
ronnametrefrom mRm1e-27
quettametrefrom mQm1e-30
thou / milfrom mmil39370.1
inchfrom min39.3701
footfrom mft3.28084
yardfrom myd1.09361
chainfrom mch0.0497097
furlongfrom mfur0.00497097
international milefrom mmi0.000621371
nautical milefrom mnmi0.000539957
U.S. survey footfrom mftUS3.28083
typographic pointfrom mpt2834.65
astronomical unitfrom mau6.68459e-12
light-secondfrom mls0.00000000333564
light-yearfrom mly1.057e-16
parsecfrom mpc3.24078e-17

SI symbols follow international notation. U.S. and Imperial measures are labelled separately where their values differ.

Browse Unit Conversions

Choose a quantity and conversion. Each page includes examples, a reverse conversion and links to other units of the same quantity. Units from different physical quantities cannot be converted directly.

Length Conversions

Distance, height, thickness and astronomical length.

qm to ft (quectometre to foot)rm to ft (rontometre to foot)ym to ft (yoctometre to foot)zm to ft (zeptometre to foot)am to ft (attometre to foot)fm to ft (femtometre to foot)pm to ft (picometre to foot)nm to ft (nanometre to foot)Å to ft (ångström to foot)µm to ft (micrometre to foot)mm to ft (millimetre to foot)cm to ft (centimetre to foot)dm to ft (decimetre to foot)m to ft (metre to foot)dam to ft (decametre to foot)hm to ft (hectometre to foot)km to ft (kilometre to foot)Mm to ft (megametre to foot)Gm to ft (gigametre to foot)Tm to ft (terametre to foot)Pm to ft (petametre to foot)Em to ft (exametre to foot)Zm to ft (zettametre to foot)Ym to ft (yottametre to foot)Rm to ft (ronnametre to foot)Qm to ft (quettametre to foot)mil to ft (thou / mil to foot)in to ft (inch to foot)ft to m (foot to metre)yd to ft (yard to foot)ch to ft (chain to foot)fur to ft (furlong to foot)mi to ft (international mile to foot)nmi to ft (nautical mile to foot)ftUS to ft (U.S. survey foot to foot)pt to ft (typographic point to foot)au to ft (astronomical unit to foot)ls to ft (light-second to foot)ly to ft (light-year to foot)pc to ft (parsec to foot)
Area Conversions

Surface, land and cross-sectional area.

µm² to ft² (square micrometre to square foot)mm² to ft² (square millimetre to square foot)cm² to ft² (square centimetre to square foot)dm² to ft² (square decimetre to square foot)m² to ft² (square metre to square foot)a to ft² (are to square foot)ha to ft² (hectare to square foot)km² to ft² (square kilometre to square foot)in² to ft² (square inch to square foot)ft² to m² (square foot to square metre)yd² to ft² (square yard to square foot)acre to ft² (acre to square foot)mi² to ft² (square mile to square foot)b to ft² (barn to square foot)
Volume Conversions

Solid volume, liquid measures and building capacity.

mm³ to L (cubic millimetre to litre)cm³ to L (cubic centimetre to litre)dm³ to L (cubic decimetre to litre)m³ to L (cubic metre to litre)km³ to L (cubic kilometre to litre)µL to L (microlitre to litre)mL to L (millilitre to litre)cL to L (centilitre to litre)dL to L (decilitre to litre)L to m³ (litre to cubic metre)kL to L (kilolitre to litre)in³ to L (cubic inch to litre)ft³ to L (cubic foot to litre)yd³ to L (cubic yard to litre)fl oz US to L (U.S. fluid ounce to litre)cup US to L (U.S. customary cup to litre)pt US to L (U.S. liquid pint to litre)qt US to L (U.S. liquid quart to litre)gal US to L (U.S. liquid gallon to litre)fl oz Imp to L (Imperial fluid ounce to litre)pt Imp to L (Imperial pint to litre)qt Imp to L (Imperial quart to litre)gal Imp to L (Imperial gallon to litre)tsp US to L (U.S. teaspoon to litre)tbsp US to L (U.S. tablespoon to litre)bbl to L (oil barrel to litre)acre·ft to L (acre-foot to litre)
Mass Conversions

Mass from laboratory samples to industrial loads.

µg to lb (microgram to avoirdupois pound)mg to lb (milligram to avoirdupois pound)g to lb (gram to avoirdupois pound)kg to lb (kilogram to avoirdupois pound)t to lb (metric tonne to avoirdupois pound)kt to lb (kilotonne to avoirdupois pound)gr to lb (grain to avoirdupois pound)oz to lb (ounce to avoirdupois pound)lb to kg (avoirdupois pound to kilogram)st to lb (stone to avoirdupois pound)ton US to lb (short ton to avoirdupois pound)ton Imp to lb (long ton to avoirdupois pound)slug to lb (slug to avoirdupois pound)ct to lb (metric carat to avoirdupois pound)Da to lb (dalton to avoirdupois pound)
Time Conversions

Durations from nanoseconds to calendar-scale intervals.

ns to h (nanosecond to hour)µs to h (microsecond to hour)ms to h (millisecond to hour)s to h (second to hour)min to h (minute to hour)h to s (hour to second)d to h (day to hour)wk to h (week to hour)fortnight to h (fortnight to hour)a to h (Julian year to hour)
Temperature Conversions

Absolute temperature scales with exact offsets.

°C to °F (degree Celsius to degree Fahrenheit)°F to °C (degree Fahrenheit to degree Celsius)K to °F (kelvin to degree Fahrenheit)°R to °F (degree Rankine to degree Fahrenheit)
Speed Conversions

Linear speed for travel, wind and physics.

m/s to mph (metre per second to mile per hour)cm/s to mph (centimetre per second to mile per hour)ft/s to mph (foot per second to mile per hour)km/h to mph (kilometre per hour to mile per hour)mph to km/h (mile per hour to kilometre per hour)kn to mph (knot to mile per hour)km/s to mph (kilometre per second to mile per hour)c to mph (speed of light in vacuum to mile per hour)
Acceleration Conversions

Change of speed, gravity and inertial acceleration.

m/s² to g₀ (metre per second squared to standard acceleration of gravity)cm/s² to g₀ (centimetre per second squared to standard acceleration of gravity)mm/s² to g₀ (millimetre per second squared to standard acceleration of gravity)ft/s² to g₀ (foot per second squared to standard acceleration of gravity)g₀ to m/s² (standard acceleration of gravity to metre per second squared)Gal to g₀ (galileo to standard acceleration of gravity)
Plane angle Conversions

Angles for geometry, surveying and rotation.

µrad to rad (microradian to radian)mrad to rad (milliradian to radian)rad to ° (radian to degree)° to rad (degree to radian)′ to rad (arcminute to radian)″ to rad (arcsecond to radian)gon to rad (gradian / gon to radian)turn to rad (turn / revolution to radian)
Frequency Conversions

Cycles, events and rotational rates.

mHz to rpm (millihertz to revolution per minute)Hz to rpm (hertz to revolution per minute)kHz to rpm (kilohertz to revolution per minute)MHz to rpm (megahertz to revolution per minute)GHz to rpm (gigahertz to revolution per minute)THz to rpm (terahertz to revolution per minute)rpm to Hz (revolution per minute to hertz)r/s to rpm (revolution per second to revolution per minute)bpm to rpm (beat per minute to revolution per minute)
Force Conversions

SI, gravitational and U.S. customary force.

dyn to kip (dyne to kilopound-force)mN to kip (millinewton to kilopound-force)N to kip (newton to kilopound-force)kN to kip (kilonewton to kilopound-force)MN to kip (meganewton to kilopound-force)gf to kip (gram-force to kilopound-force)kgf to kip (kilogram-force to kilopound-force)tf to kip (tonne-force to kilopound-force)ozf to kip (ounce-force to kilopound-force)lbf to kip (pound-force to kilopound-force)kip to kN (kilopound-force to kilonewton)pdl to kip (poundal to kilopound-force)
Pressure & stress Conversions

Pressure, material stress and fluid head.

Pa to psi (pascal to pound-force per square inch)hPa to psi (hectopascal to pound-force per square inch)kPa to psi (kilopascal to pound-force per square inch)MPa to psi (megapascal to pound-force per square inch)GPa to psi (gigapascal to pound-force per square inch)mbar to psi (millibar to pound-force per square inch)bar to psi (bar to pound-force per square inch)atm to psi (standard atmosphere to pound-force per square inch)Torr to psi (torr to pound-force per square inch)mmHg to psi (millimetre of mercury to pound-force per square inch)inHg to psi (inch of mercury, conventional to pound-force per square inch)mmH₂O to psi (millimetre of water, conventional to pound-force per square inch)inH₂O to psi (inch of water, conventional to pound-force per square inch)psf to psi (pound-force per square foot to pound-force per square inch)psi to MPa (pound-force per square inch to megapascal)ksi to psi (kilopound-force per square inch to pound-force per square inch)kgf/cm² to psi (kilogram-force per square centimetre to pound-force per square inch)
Torque & moment Conversions

Torque and structural bending moment.

N·mm to kip·ft (newton millimetre to kilopound-force foot)N·m to kip·ft (newton metre to kilopound-force foot)kN·m to kip·ft (kilonewton metre to kilopound-force foot)MN·m to kip·ft (meganewton metre to kilopound-force foot)kgf·m to kip·ft (kilogram-force metre to kilopound-force foot)ozf·in to kip·ft (ounce-force inch to kilopound-force foot)lbf·in to kip·ft (pound-force inch to kilopound-force foot)lbf·ft to kip·ft (pound-force foot to kilopound-force foot)kip·in to kip·ft (kilopound-force inch to kilopound-force foot)kip·ft to kN·m (kilopound-force foot to kilonewton metre)
Line load Conversions

Distributed force along a member or edge.

N/m to lbf/ft (newton per metre to pound-force per foot)kN/m to lbf/ft (kilonewton per metre to pound-force per foot)MN/m to lbf/ft (meganewton per metre to pound-force per foot)N/mm to lbf/ft (newton per millimetre to pound-force per foot)kgf/m to lbf/ft (kilogram-force per metre to pound-force per foot)lbf/ft to kN/m (pound-force per foot to kilonewton per metre)lbf/in to lbf/ft (pound-force per inch to pound-force per foot)kip/ft to lbf/ft (kilopound-force per foot to pound-force per foot)
Mass per area Conversions

Sheet mass and surface density.

g/m² to lb/ft² (gram per square metre to pound per square foot)kg/m² to lb/ft² (kilogram per square metre to pound per square foot)t/m² to lb/ft² (tonne per square metre to pound per square foot)oz/ft² to lb/ft² (ounce per square foot to pound per square foot)lb/ft² to kg/m² (pound per square foot to kilogram per square metre)lb/in² to lb/ft² (pound per square inch to pound per square foot)
Mass per length Conversions

Linear mass used for sections, rails and cables.

g/m to lb/ft (gram per metre to pound per foot)kg/m to lb/ft (kilogram per metre to pound per foot)t/m to lb/ft (tonne per metre to pound per foot)lb/ft to kg/m (pound per foot to kilogram per metre)lb/in to lb/ft (pound per inch to pound per foot)lb/yd to lb/ft (pound per yard to pound per foot)
Section modulus Conversions

Elastic and plastic section modulus units.

mm³ to in³ (cubic millimetre to cubic inch)cm³ to in³ (cubic centimetre to cubic inch)m³ to in³ (cubic metre to cubic inch)in³ to cm³ (cubic inch to cubic centimetre)ft³ to in³ (cubic foot to cubic inch)
Second moment of area Conversions

Area moment of inertia for section stiffness.

mm⁴ to in⁴ (millimetre to the fourth power to inch to the fourth power)cm⁴ to in⁴ (centimetre to the fourth power to inch to the fourth power)m⁴ to in⁴ (metre to the fourth power to inch to the fourth power)in⁴ to cm⁴ (inch to the fourth power to centimetre to the fourth power)ft⁴ to in⁴ (foot to the fourth power to inch to the fourth power)
Energy & work Conversions

Mechanical, electrical, thermal and particle energy.

erg to kWh (erg to kilowatt-hour)µJ to kWh (microjoule to kilowatt-hour)mJ to kWh (millijoule to kilowatt-hour)J to kWh (joule to kilowatt-hour)kJ to kWh (kilojoule to kilowatt-hour)MJ to kWh (megajoule to kilowatt-hour)GJ to kWh (gigajoule to kilowatt-hour)Wh to kWh (watt-hour to kilowatt-hour)kWh to kJ (kilowatt-hour to kilojoule)MWh to kWh (megawatt-hour to kilowatt-hour)calₜₕ to kWh (thermochemical calorie to kilowatt-hour)kcalₜₕ to kWh (thermochemical kilocalorie to kilowatt-hour)calIT to kWh (International Table calorie to kilowatt-hour)BtuIT to kWh (International Table British thermal unit to kilowatt-hour)therm US to kWh (U.S. therm to kilowatt-hour)ft·lbf to kWh (foot pound-force to kilowatt-hour)eV to kWh (electronvolt to kilowatt-hour)keV to kWh (kiloelectronvolt to kilowatt-hour)MeV to kWh (megaelectronvolt to kilowatt-hour)GeV to kWh (gigaelectronvolt to kilowatt-hour)t TNT to kWh (ton of TNT to kilowatt-hour)
Power Conversions

Rate of work, heat transfer and machinery output.

mW to hp (milliwatt to mechanical horsepower)W to hp (watt to mechanical horsepower)kW to hp (kilowatt to mechanical horsepower)MW to hp (megawatt to mechanical horsepower)GW to hp (gigawatt to mechanical horsepower)hp to kW (mechanical horsepower to kilowatt)PS to hp (metric horsepower to mechanical horsepower)hp(E) to hp (electrical horsepower to mechanical horsepower)hp(S) to hp (boiler horsepower to mechanical horsepower)ft·lbf/s to hp (foot pound-force per second to mechanical horsepower)BtuIT/h to hp (British thermal unit per hour to mechanical horsepower)TR to hp (ton of refrigeration to mechanical horsepower)
Density Conversions

Mass density for materials, fluids and gases.

kg/m³ to lb/ft³ (kilogram per cubic metre to pound per cubic foot)g/m³ to lb/ft³ (gram per cubic metre to pound per cubic foot)g/L to lb/ft³ (gram per litre to pound per cubic foot)g/cm³ to lb/ft³ (gram per cubic centimetre to pound per cubic foot)kg/L to lb/ft³ (kilogram per litre to pound per cubic foot)t/m³ to lb/ft³ (tonne per cubic metre to pound per cubic foot)lb/ft³ to kg/m³ (pound per cubic foot to kilogram per cubic metre)lb/in³ to lb/ft³ (pound per cubic inch to pound per cubic foot)slug/ft³ to lb/ft³ (slug per cubic foot to pound per cubic foot)lb/gal US to lb/ft³ (pound per U.S. gallon to pound per cubic foot)lb/gal Imp to lb/ft³ (pound per Imperial gallon to pound per cubic foot)
Mass flow Conversions

Mass transported per unit time.

g/s to lb/min (gram per second to pound per minute)kg/min to lb/min (kilogram per minute to pound per minute)kg/h to lb/min (kilogram per hour to pound per minute)kg/s to lb/min (kilogram per second to pound per minute)t/h to lb/min (tonne per hour to pound per minute)lb/s to lb/min (pound per second to pound per minute)lb/min to kg/h (pound per minute to kilogram per hour)lb/h to lb/min (pound per hour to pound per minute)ton US/h to lb/min (short ton per hour to pound per minute)
Volume flow Conversions

Volumetric flow for pipes, ducts and pumps.

m³/s to cfm (cubic metre per second to cubic foot per minute)m³/min to cfm (cubic metre per minute to cubic foot per minute)m³/h to cfm (cubic metre per hour to cubic foot per minute)L/s to cfm (litre per second to cubic foot per minute)L/min to cfm (litre per minute to cubic foot per minute)L/h to cfm (litre per hour to cubic foot per minute)mL/min to cfm (millilitre per minute to cubic foot per minute)ft³/s to cfm (cubic foot per second to cubic foot per minute)cfm to L/s (cubic foot per minute to litre per second)gpm US to cfm (U.S. gallon per minute to cubic foot per minute)gph US to cfm (U.S. gallon per hour to cubic foot per minute)gpm Imp to cfm (Imperial gallon per minute to cubic foot per minute)bbl/d to cfm (oil barrel per day to cubic foot per minute)
Dynamic viscosity Conversions

Absolute viscosity for fluids and gases.

Pa·s to cP (pascal second to centipoise)mPa·s to cP (millipascal second to centipoise)P to cP (poise to centipoise)cP to Pa·s (centipoise to pascal second)lbf·s/ft² to cP (pound-force second per square foot to centipoise)lbf·s/in² to cP (pound-force second per square inch to centipoise)
Kinematic viscosity Conversions

Kinematic viscosity and diffusivity units.

m²/s to cSt (square metre per second to centistokes)cm²/s to m²/s (square centimetre per second to square metre per second)mm²/s to m²/s (square millimetre per second to square metre per second)St to m²/s (stokes to square metre per second)cSt to m²/s (centistokes to square metre per second)ft²/s to m²/s (square foot per second to square metre per second)
Permeability Conversions

Intrinsic permeability of porous media.

m² to mD (square metre to millidarcy)µm² to m² (square micrometre to square metre)D to m² (darcy to square metre)mD to m² (millidarcy to square metre)µD to m² (microdarcy to square metre)
Thermal conductivity Conversions

Material heat conduction coefficients.

W/(m·K) to BtuIT/(h·ft·°F) (watt per metre kelvin to Btu per hour foot degree Fahrenheit)mW/(m·K) to BtuIT/(h·ft·°F) (milliwatt per metre kelvin to Btu per hour foot degree Fahrenheit)W/(cm·K) to BtuIT/(h·ft·°F) (watt per centimetre kelvin to Btu per hour foot degree Fahrenheit)BtuIT/(h·ft·°F) to W/(m·K) (Btu per hour foot degree Fahrenheit to watt per metre kelvin)
Heat transfer coefficient Conversions

Surface heat-transfer and U-value units.

W/(m²·K) to BtuIT/(h·ft²·°F) (watt per square metre kelvin to Btu per hour square foot degree Fahrenheit)kW/(m²·K) to BtuIT/(h·ft²·°F) (kilowatt per square metre kelvin to Btu per hour square foot degree Fahrenheit)BtuIT/(h·ft²·°F) to W/(m²·K) (Btu per hour square foot degree Fahrenheit to watt per square metre kelvin)
Specific heat capacity Conversions

Heat capacity per unit mass.

J/(kg·K) to BtuIT/(lb·°F) (joule per kilogram kelvin to Btu per pound degree Fahrenheit)kJ/(kg·K) to BtuIT/(lb·°F) (kilojoule per kilogram kelvin to Btu per pound degree Fahrenheit)calₜₕ/(g·°C) to BtuIT/(lb·°F) (thermochemical calorie per gram degree Celsius to Btu per pound degree Fahrenheit)BtuIT/(lb·°F) to kJ/(kg·K) (Btu per pound degree Fahrenheit to kilojoule per kilogram kelvin)
Thermal expansion Conversions

Linear expansion coefficient per temperature interval.

1/K to 1/°F (per kelvin to per degree Fahrenheit)µm/(m·K) to 1/°F (micrometre per metre kelvin to per degree Fahrenheit)ppm/K to 1/°F (parts per million per kelvin to per degree Fahrenheit)1/°F to µm/(m·K) (per degree Fahrenheit to micrometre per metre kelvin)ppm/°F to 1/°F (parts per million per degree Fahrenheit to per degree Fahrenheit)
Temperature interval Conversions

Temperature differences without absolute-scale offsets.

ΔK to Δ°F (kelvin interval to Fahrenheit degree interval)Δ°C to Δ°F (Celsius degree interval to Fahrenheit degree interval)Δ°F to Δ°C (Fahrenheit degree interval to Celsius degree interval)Δ°R to Δ°F (Rankine degree interval to Fahrenheit degree interval)
Electric current Conversions

SI electric current with practical prefixes.

nA to mA (nanoampere to milliampere)µA to mA (microampere to milliampere)mA to A (milliampere to ampere)A to mA (ampere to milliampere)kA to mA (kiloampere to milliampere)MA to mA (megaampere to milliampere)
Voltage Conversions

Electric potential difference.

µV to mV (microvolt to millivolt)mV to V (millivolt to volt)V to mV (volt to millivolt)kV to mV (kilovolt to millivolt)MV to mV (megavolt to millivolt)
Electrical resistance Conversions

Electrical resistance from micro-ohms to teraohms.

µΩ to kΩ (microohm to kiloohm)mΩ to kΩ (milliohm to kiloohm)Ω to kΩ (ohm to kiloohm)kΩ to Ω (kiloohm to ohm)MΩ to kΩ (megaohm to kiloohm)GΩ to kΩ (gigaohm to kiloohm)TΩ to kΩ (teraohm to kiloohm)
Electrical conductance Conversions

Conductance in siemens.

µS to mS (microsiemens to millisiemens)mS to S (millisiemens to siemens)S to mS (siemens to millisiemens)kS to mS (kilosiemens to millisiemens)
Electric charge Conversions

Electric charge and ampere-hour capacity.

nC to Ah (nanocoulomb to ampere-hour)µC to Ah (microcoulomb to ampere-hour)mC to Ah (millicoulomb to ampere-hour)C to Ah (coulomb to ampere-hour)mAh to Ah (milliampere-hour to ampere-hour)Ah to C (ampere-hour to coulomb)e to Ah (elementary charge to ampere-hour)
Capacitance Conversions

Electrical capacitance.

pF to nF (picofarad to nanofarad)nF to µF (nanofarad to microfarad)µF to nF (microfarad to nanofarad)mF to nF (millifarad to nanofarad)F to nF (farad to nanofarad)kF to nF (kilofarad to nanofarad)
Inductance Conversions

Electrical inductance.

nH to µH (nanohenry to microhenry)µH to mH (microhenry to millihenry)mH to µH (millihenry to microhenry)H to µH (henry to microhenry)
Magnetic flux Conversions

Magnetic flux in webers and maxwells.

µWb to mWb (microweber to milliweber)mWb to Wb (milliweber to weber)Wb to mWb (weber to milliweber)Mx to mWb (maxwell to milliweber)
Magnetic flux density Conversions

Magnetic field flux density.

nT to G (nanotesla to gauss)µT to G (microtesla to gauss)mT to G (millitesla to gauss)T to G (tesla to gauss)G to T (gauss to tesla)
Illuminance Conversions

Light arriving on a surface.

lx to fc (lux to foot-candle)klx to fc (kilolux to foot-candle)fc to lx (foot-candle to lux)
Luminous flux Conversions

Total visible light output.

lm to klm (lumen to kilolumen)klm to lm (kilolumen to lumen)Mlm to klm (megalumen to kilolumen)
Radioactivity Conversions

Nuclear decay rate.

Bq to Ci (becquerel to curie)kBq to Ci (kilobecquerel to curie)MBq to Ci (megabecquerel to curie)GBq to Ci (gigabecquerel to curie)Ci to Bq (curie to becquerel)mCi to Ci (millicurie to curie)µCi to Ci (microcurie to curie)
Absorbed dose Conversions

Energy absorbed per unit mass.

µGy to rad (microgray to rad)mGy to rad (milligray to rad)Gy to rad (gray to rad)kGy to rad (kilogray to rad)rad to Gy (rad to gray)
Equivalent dose Conversions

Radiation protection dose equivalent.

µSv to rem (microsievert to roentgen equivalent man)mSv to rem (millisievert to roentgen equivalent man)Sv to rem (sievert to roentgen equivalent man)rem to mSv (roentgen equivalent man to millisievert)mrem to rem (millirem to roentgen equivalent man)
Amount of substance Conversions

Amount of substance and particle count.

nmol to mmol (nanomole to millimole)µmol to mmol (micromole to millimole)mmol to mol (millimole to mole)mol to mmol (mole to millimole)kmol to mmol (kilomole to millimole)entities to mmol (elementary entities to millimole)
Molar concentration Conversions

Amount concentration of solutions.

mol/m³ to mmol/L (mole per cubic metre to millimole per litre)mmol/m³ to mmol/L (millimole per cubic metre to millimole per litre)mol/L to mmol/L (mole per litre to millimole per litre)mmol/L to mol/L (millimole per litre to mole per litre)µmol/L to mmol/L (micromole per litre to millimole per litre)
Digital storage Conversions

Decimal and binary data quantities are kept distinct.

bit to MiB (bit to mebibyte (binary))B to MiB (byte to mebibyte (binary))kB to MiB (kilobyte (decimal) to mebibyte (binary))MB to MiB (megabyte (decimal) to mebibyte (binary))GB to MiB (gigabyte (decimal) to mebibyte (binary))TB to MiB (terabyte (decimal) to mebibyte (binary))PB to MiB (petabyte (decimal) to mebibyte (binary))KiB to MiB (kibibyte (binary) to mebibyte (binary))MiB to MB (mebibyte (binary) to megabyte (decimal))GiB to MiB (gibibyte (binary) to mebibyte (binary))TiB to MiB (tebibyte (binary) to mebibyte (binary))PiB to MiB (pebibyte (binary) to mebibyte (binary))
Data rate Conversions

Decimal bit and byte transfer rates.

bit/s to MB/s (bit per second to megabyte per second)kbit/s to MB/s (kilobit per second to megabyte per second)Mbit/s to MB/s (megabit per second to megabyte per second)Gbit/s to MB/s (gigabit per second to megabyte per second)Tbit/s to MB/s (terabit per second to megabyte per second)B/s to MB/s (byte per second to megabyte per second)kB/s to MB/s (kilobyte per second to megabyte per second)MB/s to Mbit/s (megabyte per second to megabit per second)GB/s to MB/s (gigabyte per second to megabyte per second)
Fuel economy Conversions

Reciprocal fuel economy and consumption measures.

L/100 km to mpg US (litres per 100 kilometres to miles per U.S. gallon)km/L to mpg US (kilometres per litre to miles per U.S. gallon)mpg US to L/100 km (miles per U.S. gallon to litres per 100 kilometres)mpg Imp to mpg US (miles per Imperial gallon to miles per U.S. gallon)mi/L to mpg US (miles per litre to miles per U.S. gallon)
Angular velocity Conversions

Rate of rotation expressed as an angle per time.

rad/s to rpm (radian per second to revolution per minute)°/s to rad/s (degree per second to radian per second)°/h to rad/s (degree per hour to radian per second)rpm to rad/s (revolution per minute to radian per second)r/s to rad/s (revolution per second to radian per second)
Angular acceleration Conversions

Change of angular velocity per unit time.

rad/s² to °/s² (radian per second squared to degree per second squared)°/s² to rad/s² (degree per second squared to radian per second squared)rpm/s to °/s² (revolution per minute per second to degree per second squared)rpm/min to °/s² (revolution per minute per minute to degree per second squared)
Momentum & impulse Conversions

Linear momentum and equivalent mechanical impulse.

kg·m/s to lb·ft/s (kilogram metre per second to pound foot per second)N·s to lb·ft/s (newton second to pound foot per second)g·cm/s to lb·ft/s (gram centimetre per second to pound foot per second)lb·ft/s to N·s (pound foot per second to newton second)lbf·s to lb·ft/s (pound-force second to pound foot per second)slug·ft/s to lb·ft/s (slug foot per second to pound foot per second)
Mass moment of inertia Conversions

Rotational mass moment of inertia.

kg·m² to lb·ft² (kilogram square metre to pound square foot)kg·cm² to lb·ft² (kilogram square centimetre to pound square foot)g·cm² to lb·ft² (gram square centimetre to pound square foot)lb·in² to lb·ft² (pound square inch to pound square foot)lb·ft² to kg·m² (pound square foot to kilogram square metre)slug·ft² to lb·ft² (slug square foot to pound square foot)
Surface tension Conversions

Force per length at a liquid interface.

N/m to dyn/cm (newton per metre to dyne per centimetre)mN/m to dyn/cm (millinewton per metre to dyne per centimetre)dyn/cm to N/m (dyne per centimetre to newton per metre)lbf/ft to dyn/cm (pound-force per foot to dyne per centimetre)lbf/in to dyn/cm (pound-force per inch to dyne per centimetre)
Specific volume Conversions

Volume occupied per unit mass.

m³/kg to ft³/lb (cubic metre per kilogram to cubic foot per pound)L/kg to ft³/lb (litre per kilogram to cubic foot per pound)cm³/g to ft³/lb (cubic centimetre per gram to cubic foot per pound)ft³/lb to m³/kg (cubic foot per pound to cubic metre per kilogram)in³/lb to ft³/lb (cubic inch per pound to cubic foot per pound)
Mass flux Conversions

Mass flow per unit area.

kg/(m²·s) to lb/(ft²·h) (kilogram per square metre second to pound per square foot hour)kg/(m²·h) to lb/(ft²·h) (kilogram per square metre hour to pound per square foot hour)g/(m²·s) to lb/(ft²·h) (gram per square metre second to pound per square foot hour)lb/(ft²·s) to lb/(ft²·h) (pound per square foot second to pound per square foot hour)lb/(ft²·h) to kg/(m²·s) (pound per square foot hour to kilogram per square metre second)
Heat flux Conversions

Heat-transfer rate per surface area.

W/m² to BtuIT/(h·ft²) (watt per square metre to Btu per hour square foot)kW/m² to BtuIT/(h·ft²) (kilowatt per square metre to Btu per hour square foot)W/cm² to BtuIT/(h·ft²) (watt per square centimetre to Btu per hour square foot)BtuIT/(h·ft²) to W/m² (Btu per hour square foot to watt per square metre)
Energy density Conversions

Energy stored per unit volume.

J/m³ to Wh/L (joule per cubic metre to watt-hour per litre)kJ/m³ to Wh/L (kilojoule per cubic metre to watt-hour per litre)MJ/m³ to Wh/L (megajoule per cubic metre to watt-hour per litre)J/L to Wh/L (joule per litre to watt-hour per litre)Wh/L to J/m³ (watt-hour per litre to joule per cubic metre)kWh/m³ to Wh/L (kilowatt-hour per cubic metre to watt-hour per litre)BtuIT/ft³ to Wh/L (Btu per cubic foot to watt-hour per litre)
Specific energy Conversions

Energy stored or released per unit mass.

J/kg to Wh/kg (joule per kilogram to watt-hour per kilogram)kJ/kg to Wh/kg (kilojoule per kilogram to watt-hour per kilogram)MJ/kg to Wh/kg (megajoule per kilogram to watt-hour per kilogram)Wh/kg to kJ/kg (watt-hour per kilogram to kilojoule per kilogram)kWh/kg to Wh/kg (kilowatt-hour per kilogram to watt-hour per kilogram)calₜₕ/g to Wh/kg (thermochemical calorie per gram to watt-hour per kilogram)BtuIT/lb to Wh/kg (Btu per pound to watt-hour per kilogram)
Electrical resistivity Conversions

Material electrical resistance times length scale.

Ω·m to µΩ·cm (ohm metre to microohm centimetre)Ω·cm to µΩ·cm (ohm centimetre to microohm centimetre)µΩ·m to µΩ·cm (microohm metre to microohm centimetre)µΩ·cm to Ω·m (microohm centimetre to ohm metre)Ω·mm²/m to µΩ·cm (ohm square millimetre per metre to microohm centimetre)
Electrical conductivity Conversions

Material electrical conductance per length.

S/m to mS/cm (siemens per metre to millisiemens per centimetre)mS/m to mS/cm (millisiemens per metre to millisiemens per centimetre)S/cm to mS/cm (siemens per centimetre to millisiemens per centimetre)mS/cm to S/m (millisiemens per centimetre to siemens per metre)µS/cm to mS/cm (microsiemens per centimetre to millisiemens per centimetre)
Electric field strength Conversions

Electric potential gradient.

V/m to kV/mm (volt per metre to kilovolt per millimetre)V/cm to kV/mm (volt per centimetre to kilovolt per millimetre)V/mm to kV/mm (volt per millimetre to kilovolt per millimetre)kV/m to kV/mm (kilovolt per metre to kilovolt per millimetre)kV/mm to V/m (kilovolt per millimetre to volt per metre)V/in to kV/mm (volt per inch to kilovolt per millimetre)
Luminance Conversions

Luminous intensity per projected area.

cd/m² to fL (candela per square metre / nit to foot-lambert)cd/cm² to fL (candela per square centimetre / stilb to foot-lambert)fL to cd/m² (foot-lambert to candela per square metre / nit)L to fL (lambert to foot-lambert)
Radiation exposure Conversions

Ionizing-radiation exposure in air.

C/kg to R (coulomb per kilogram to roentgen)mC/kg to R (millicoulomb per kilogram to roentgen)R to C/kg (roentgen to coulomb per kilogram)mR to R (milliroentgen to roentgen)
Catalytic activity Conversions

Catalytic activity and enzyme units.

nkat to U (nanokatal to enzyme unit)µkat to U (microkatal to enzyme unit)mkat to U (millikatal to enzyme unit)kat to U (katal to enzyme unit)U to µkat (enzyme unit to microkatal)
Molar mass Conversions

Mass per amount of substance.

kg/mol to kg/kmol (kilogram per mole to kilogram per kilomole)g/mol to kg/kmol (gram per mole to kilogram per kilomole)mg/mol to kg/kmol (milligram per mole to kilogram per kilomole)kg/kmol to g/mol (kilogram per kilomole to gram per mole)lb/lbmol to kg/kmol (pound per pound-mole to kilogram per kilomole)
Molar energy Conversions

Energy per amount of substance.

J/mol to kcalₜₕ/mol (joule per mole to thermochemical kilocalorie per mole)kJ/mol to kcalₜₕ/mol (kilojoule per mole to thermochemical kilocalorie per mole)calₜₕ/mol to kcalₜₕ/mol (thermochemical calorie per mole to thermochemical kilocalorie per mole)kcalₜₕ/mol to kJ/mol (thermochemical kilocalorie per mole to kilojoule per mole)eV/entity to kcalₜₕ/mol (electronvolt per entity to thermochemical kilocalorie per mole)
Ratios & concentration Conversions

Dimensionless ratios, percentages and parts-per notation.

1 to % (ratio to percent)% to 1 (percent to ratio)‰ to 1 (per mille to ratio)ppm to 1 (parts per million to ratio)ppb to 1 (parts per billion to ratio)ppt to 1 (parts per trillion to ratio)

Checking A Unit Conversion

Choose the physical quantity first, then the source and destination units. Decimal values, scientific notation and supported fractions can be entered directly.

Use The Correct Quantity

Length, area, volume, force and pressure are separate quantities. Select units from the intended family instead of reusing a length factor for an area or volume. Read the equation beside the result before copying it.

Examples To Check

1 m = 1,000 mm; 1 m² = 1,000,000 mm²; and 1 MPa = 1 N/mm². Temperature conversions may include an offset: 0 °C = 32 °F. These examples explain why not every conversion is a simple change of decimal places.

Keep Useful Precision

A converted value cannot make its source measurement more accurate. Keep enough precision for intermediate work and round for the final report only as appropriate. A unit conversion does not establish which units or design values a project should use.