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Physical Measurement Laboratory

NIST Guide to the SI, Appendix B.8: Factors for Units Listed Alphabetically

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Caution: The units listed in column 1 are in general not to be used in NIST publications, with the exception of those few in italic type.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Factors in boldface are exact

A
To convert from to Multiply by
abampere ampere (A) 1.0 E+01
abcoulomb coulomb (C) 1.0 E+01
abfarad farad (F) 1.0 E+09
abhenry henry (H) 1.0 E-09
abmho siemens (S) 1.0 E+09
abohm ohm (Ω) 1.0 E-09
abvolt volt (V) 1.0 E-08
acceleration of free fall, standard (gn) meter per second squared (m / s2) 9.806 65 E+00
acre (based on U.S. survey foot) square meter (m2) 4.046 873 E+03
acre foot (based on U.S. survey foot) 7 cubic meter (m3) 1.233 489 E+03
ampere hour (A · h) coulomb (C) 3.6 E+03
ångström (Å) meter (m) 1.0 E-10
ångström (Å) nanometer (nm) 1.0 E-01
are (a) square meter (m2) 1.0 E+02
astronomical unit (au) meter (m) 1.495 979 E+11
atmosphere, standard (atm) pascal (Pa) 1.013 25 E+05
atmosphere, standard (atm) kilopascal (kPa) 1.013 25 E+02
atmosphere, technical (at) 8 pascal (Pa) 9.806 65 E+04
atmosphere, technical (at) 8 kilopascal (kPa) 9.806 65 E+01

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B
To convert from to Multiply by
bar (bar) pascal (Pa) 1.0 E+05
bar (bar) kilopascal (kPa) 1.0 E+02
barn (b) square meter (m2) 1.0 E-28
barrel [for petroleum, 42 gallons (U.S.)] (bbl) cubic meter (m3) 1.589 873  E-01
barrel [for petroleum, 42 gallons (U.S.)] (bbl) liter (L) 1.589 873 E+02
biot (Bi) ampere (A) 1.0 E+01
British thermal unitIT(BtuIT)9 joule (J) 1.055 056 E+03
British thermal unitth(Btuth) 9 joule (J) 1.054 350 E+03
British thermal unit (mean) (Btu) joule (J) 1.055 87 E+03
British thermal unit (39 °F) (Btu) joule (J) 1.059 67 E+03
British thermal unit (59 °F) (Btu) joule (J) 1.054 80 E+03
British thermal unit (60 °F) (Btu) joule (J) 1.054 68 E+03
British thermal unitIT foot per hour square foot degree Fahrenheit [BtuIT · ft/(h · ft2 · °F)] watt per meter kelvin [W/(m · K)] 1.730 735 E+00
British thermal unitth foot per hour square foot degree Fahrenheit [Btuth · ft/(h · ft2 · °F)] watt per meter kelvin [W/(m · K)] 1.729 577 E+00
British thermal unitIT inch per hour square foot degree Fahrenheit [BtuIT · in/(h · ft2 · °F)] watt per meter kelvin [W/(m · K)] 1.442 279 E-01
British thermal unitth inch per hour square foot degree Fahrenheit [Btuth · in/(h · ft2 · °F)] watt per meter kelvin [W / (m · K)] 1.441 314 E-01
British thermal unitIT inch per second square foot degree Fahrenheit [BtuIT · in /(s · ft2 · °F)] watt per meter kelvin [W/(m · K)] 5.192 204 E+02
British thermal unitth inch per second square foot degree Fahrenheit [Btuth · in /(s · ft2 · °F)] watt per meter kelvin [W/(m · K)] 5.188 732 E+02
British thermal unitIT per cubic foot (BtuIT/ft3) joule per cubic meter (J/m3) 3.725 895 E+04
British thermal unitth per cubic foot (Btuth/ft3) joule per cubic meter (J/m3) 3.723 403 E+04
British thermal unitIT per degree Fahrenheit (BtuIT/°F) joule per kelvin (J/K) 1.899 101 E+03
British thermal unitth per degree Fahrenheit (Btuth/°F) joule per kelvin (J/K) 1.897 830 E+03
British thermal unitIT per degree Rankine (BtuIT/°R) joule per kelvin (J/K) 1.899 101 E+03
British thermal unitth per degree Rankine (Btuth/°R) joule per kelvin (J/K) 1.897 830 E+03
British thermal unitIT per hour (BtuIT/h) watt (W) 2.930 711 E-01
British thermal unitth per hour (Btuth/h) watt (W) 2.928 751 E-01
British thermal unitIT per hour square foot degree Fahrenheit [BtuIT/(h · ft2 · °F)] watt per square meter kelvin [W/(m2 · K)] 5.678 263 E+00
British thermal unitth per hour square foot degree Fahrenheit [Btuth/(h · ft2 · °F)] watt per square meter kelvin [W/(m2 · K)] 5.674 466 E+00
British thermal unitth per minute (Btuth/min) watt (W) 1.757 250 E+01
British thermal unitIT per pound (BtuIT/lb) joule per kilogram (J/kg) 2.326 E+03
British thermal unitth per pound (Btuth/lb) joule per kilogram (J/kg) 2.324 444 E+03
British thermal unitIT per pound degree Fahrenheit [BtuIT/(lb · °F)] joule per kilogram kelvin [J/(kg · K)] 4.1868 E+03
British thermal unitth per pound degree Fahrenheit [Btuth/(lb · °F)] joule per kilogram kelvin [J/(kg · K)] 4.184 E+03
British thermal unitIT per pound degree Rankine [BtuIT/(lb · °R)] joule per kilogram kelvin [J/(kg · K)] 4.1868 E+03
British thermal unitth per pound degree Rankine [Btuth/(lb · °R)] joule per kilogram kelvin [J/(kg · K)] 4.184 E+03
British thermal unitIT per second (BtuIT/s) watt (W) 1.055 056 E+03
British thermal unitth per second (Btuth/s) watt (W) 1.054 350 E+03
British thermal unitIT per second square foot degree Fahrenheit [BtuIT/(s · ft2 · °F)] watt per square meter kelvin [W/(m2 · K)] 2.044 175 E+04
British thermal unitth per second square foot degree Fahrenheit [Btuth/(s · ft2 · °F)] watt per square meter kelvin [W/(m2 · K)] 2.042 808 E+04
British thermal unitIT per square foot (BtuIT/ft2) joule per square meter (J/m2) 1.135 653 E+04
British thermal unitth per square foot (Btuth/ft2) joule per square meter (J/m2) 1.134 893 E+04
British thermal unitIT per square foot hour [BtuIT/(ft2 · h)] watt per square meter (W/m2) 3.154 591 E+00
British thermal unitth per square foot hour [Btuth/(ft2 · h)] watt per square meter (W/m2) 3.152 481 E+00
British thermal unitth per square foot minute [Btuth/(ft2 · min)] watt per square meter (W/m2) 1.891 489 E+02
British thermal unitIT per square foot second [BtuIT/(ft2 · s)] watt per square meter (W/m2) 1.135 653 E+04
British thermal unitth per square foot second [Btuth/(ft2 · s)] watt per square meter (W/m2) 1.134 893 E+04
British thermal unitth per square inch second [Btuth/(in2 · s)] watt per square meter (W/m2) 1.634 246 E+06
bushel (U.S.) (bu) cubic meter (m3) 3.523 907 E-02
bushel (U.S.) (bu) liter (L) 3.523 907 E+01

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C
To convert from to Multiply by
calorieIT (calIT) 10 joule (J) 4.1868 E+00
calorieth (calth) 10 joule (J) 4.184 E+00
calorie (cal) (mean) joule (J) 4.190 02 E+00
calorie (15 °C) (cal15) joule (J) 4.185 80 E+00
calorie (20 °C) (cal20) joule (J) 4.181 90 E+00
calorieIT, kilogram (nutrition) 11 joule (J) 4.1868 E+03
calorieth , kilogram (nutrition) 11 joule (J) 4.184 E+03
calorie (mean), kilogram (nutrition) 11 joule (J) 4.190 02 E+03
calorieth per centimeter second degree Celsius [calth/(cm · s · °C)] watt per meter kelvin [W/(m · K)] 4.184 E+02
calorieIT per gram (calIT/g) joule per kilogram (J/kg) 4.1868 E+03
calorieth per gram (calth/g) joule per kilogram (J/kg) 4.184 E+03
calorieIT per gram degree Celsius [calIT/(g · °C)] joule per kilogram kelvin [J/(kg · K)] 4.1868 E+03
calorieth per gram degree Celsius [calth/(g · °C)] joule per kilogram kelvin [J/(kg · K)] 4.184 E+03
calorieIT per gram kelvin [calIT/(g · K)] joule per kilogram kelvin [J/(kg · K)] 4.1868 E+03
calorieth per gram kelvin [calth/(g· K)] joule per kilogram kelvin [J/(kg · K)] 4.184 E+03
calorieth per minute (calth/min) watt (W) 6.973 333 E-02
calorieth per second (calth/s) watt (W) 4.184 E+00
calorieth per square centimeter (calth/cm2) joule per square meter (J/m2) 4.184 E+04
calorieth per square centimeter minute [calth/(cm2 · min)] watt per square meter (W/m2) 6.973 333 E+02
calorieth per square centimeter second [calth/(cm2 · s)] watt per square meter (W/m2) 4.184 E+04
candela per square inch (cd/in2) candela per square meter (cd/m2) 1.550 003 E+03
carat, metric kilogram (kg) 2.0 E-04
carat, metric gram (g) 2.0 E-01
centimeter of mercury (0 °C) 12 pascal (Pa) 1.333 22 E+03
centimeter of mercury (0 °C) 12 kilopascal (kPa) 1.333 22 E+00
centimeter of mercury, conventional (cmHg) 12 pascal (Pa) 1.333 224 E+03
centimeter of mercury, conventional (cmHg) 12 kilopascal (kPa) 1.333 224 E+00
centimeter of water (4 °C) 12 pascal (Pa) 9.806 38 E+01
centimeter of water, conventional (cmH2O)12 pascal (Pa) 9.806 65 E+01
centipoise (cP) pascal second (Pa · s) 1.0 E-03
centistokes (cSt) meter squared per second (m2/s) 1.0 E-06
chain (based on U.S. survey foot) (ch) 7 meter (m) 2.011 684 E+01
circular mil square meter (m2) 5.067 075 E-10
circular mil square millimeter (mm2) 5.067 075 E-04
clo square meter kelvin per watt (m2 · K/W) 1.55 E-01
cord (128 ft3) cubic meter (m3) 3.624 556 E+00
cubic foot (ft3) cubic meter (m3) 2.831 685 E-02
cubic foot per minute (ft3/min) cubic meter per second (m3/s) 4.719 474 E-04
cubic foot per minute (ft3/min) liter per second (L/s) 4.719 474 E-01
cubic foot per second (ft3/s) cubic meter per second (m3/s) 2.831 685 E-02
cubic inch (in3) 13 cubic meter (m3) 1.638 706 E-05
cubic inch per minute (in3/min) cubic meter per second (m3/s) 2.731 177 E-07
cubic mile (mi3) cubic meter (m3) 4.168 182 E+09
cubic yard (yd3) cubic meter (m3) 7.645 549 E-01
cubic yard per minute (yd3/min) cubic meter per second (m3/s) 1.274 258 E-02
cup (U.S.) cubic meter (m3) 2.365 882 E-04
cup (U.S.) liter (L) 2.365 882 E-01
cup (U.S.) milliliter (mL) 2.365 882 E+02
curie (Ci) becquerel (Bq) 3.7 E+10

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D
To convert from to Multiply by
darcy 14 meter squared (m2) 9.869 233 E-13
day (d) second (s) 8.64 E+04
day (sidereal) second (s) 8.616 409 E+04
debye (D) coulomb meter (C · m) 3.335 641 E-30
degree (angle) (°) radian (rad) 1.745 329 E-02
degree Celsius (temperature) (°C) kelvin (K) T/K = t/°C + 273.15
degree Celsius (temperature interval) (°C) kelvin (K) 1.0 E+00
degree centigrade (temperature) 15 degree Celsius (°C) t/°C ≈ t/deg. cent.
degree centigrade (temperature interval) 15 degree Celsius (°C) 1.0 E+00
degree Fahrenheit (temperature) (°F) degree Celsius (°C) t/°C = (t/°F - 32)/1.8
degree Fahrenheit (temperature) (°F) kelvin (K) T/K = (t/°F + 459.67)/1.8
degree Fahrenheit (temperature interval) (°F) degree Celsius (°C) 5.555 556 E-01
degree Fahrenheit (temperature interval) (°F) kelvin (K) 5.555 556 E-01
degree Fahrenheit hour per British thermal unitIT(°F · h/BtuIT) kelvin per watt (K/W) 1.895 634 E+00
degree Fahrenheit hour per British thermal unitth(°F · h/Btuth) kelvin per watt (K/W) 1.896 903 E+00
degree Fahrenheit hour square foot per British thermal unitIT(°F · h · ft2/BtuIT) square meter kelvin per watt (m2 · K/W) 1.761 102 E-01
degree Fahrenheit hour square foot per British thermal unitth(°F · h · ft2/Btuth) square meter kelvin per watt (m2 · K/W) 1.762 280 E-01
degree Fahrenheit hour square foot per British thermal unitIT inch [°F · h · ft2/(BtuIT · in)] meter kelvin per watt (m · K/W) 6.933 472 E+00
degree Fahrenheit hour square foot per British thermal unitth inch [°F · h · ft2/(Btuth · in)] meter kelvin per watt (m · K/W) 6.938 112 E+00
degree Fahrenheit second per British thermal unitIT(°F · s/BtuIT) kelvin per watt (K/W) 5.265 651 E-04
degree Fahrenheit second per British thermal unitth(°F · s/Btuth) kelvin per watt (K/W) 5.269 175 E-04
degree Rankine (°R) kelvin (K) T/K = (T/°R)/1.8
degree Rankine (temperature interval) (°R) kelvin (K) 5.555 556 E-01
denier kilogram per meter (kg/m) 1.111 111 E-07
denier gram per meter (g/m) 1.111 111 E-04
dyne (dyn) newton (N) 1.0 E-05
dyne centimeter (dyn · cm) newton meter (N · m) 1.0 E-07
dyne per square centimeter (dyn/cm2) pascal (Pa) 1.0 E-01

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E
To convert from to Multiply by
electronvolt (eV) joule (J) 1.602 177 E-19
EMU of capacitance (abfarad) farad (F) 1.0 E+09
EMU of current (abampere) ampere (A) 1.0 E+01
EMU of electric potential (abvolt) volt (V) 1.0 E-08
EMU of inductance (abhenry) henry (H) 1.0 E-09
EMU of resistance (abohm) ohm (Ω) 1.0 E-09
erg (erg) joule (J) 1.0 E-07
erg per second (erg/s) watt (W) 1.0 E-07
erg per square centimeter second [erg/(cm2 · s)] watt per square meter (W/m2) 1.0 E-03
ESU of capacitance (statfarad) farad (F) 1.112 650 E-12
ESU of current (statampere) ampere (A) 3.335 641 E-10
ESU of electric potential (statvolt) volt (V) 2.997 925 E+02
ESU of inductance (stathenry) henry (H) 8.987 552 E+11
ESU of resistance (statohm) ohm (Ω) 8.987 552 E+11

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F
To convert from to Multiply by
faraday (based on carbon 12) coulomb (C) 9.648 531 E+04
fathom (based on U.S. survey foot) 7 meter (m) 1.828 804 E+00
fermi meter (m) 1.0 E-15
fermi femtometer (fm) 1.0 E+00
fluid ounce (U.S.) (fl oz) cubic meter (m3) 2.957 353 E-05
fluid ounce (U.S.) (fl oz) milliliter (mL) 2.957 353 E+01
foot (ft) meter (m) 3.048 E-01
foot (U.S. survey) (ft) 7 meter (m) 3.048 006 E-01
footcandle lux (lx) 1.076 391 E+01
footlambert candela per square meter (cd/m2) 3.426 259 E+00
foot of mercury, conventional (ftHg) 12 pascal (Pa) 4.063 666 E+04
foot of mercury, conventional (ftHg) 12 kilopascal (kPa) 4.063 666 E+01
foot of water (39.2 °F) 12 pascal (Pa) 2.988 98 E+03
foot of water (39.2 °F) 12 kilopascal (kPa) 2.988 98 E+00
foot of water, conventional (ftH2O) 12 pascal (Pa) 2.989 067 E+03
foot of water, conventional (ftH2O) 12 kilopascal (kPa) 2.989 067 E+00
foot per hour (ft/h) meter per second (m/s) 8.466 667 E-05
foot per minute (ft/min) meter per second (m/s) 5.08 E-03
foot per second (ft/s) meter per second (m/s) 3.048 E-01
foot per second squared (ft/s2) meter per second squared (m/s2) 3.048 E-01
foot poundal joule (J) 4.214 011 E-02
foot pound-force (ft · lbf) joule (J) 1.355 818 E+00
foot pound-force per hour (ft · lbf/h) watt (W) 3.766 161 E-04
foot pound-force per minute (ft · lbf/min) watt (W) 2.259 697 E-02
foot pound-force per second (ft · lbf/s) watt (W) 1.355 818 E+00
foot to the fourth power (ft4) 16 meter to the fourth power (m4) 8.630 975 E-03
franklin (Fr) coulomb (C) 3.335 641 E-10

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G
To convert from to Multiply by
gal (Gal) meter per second squared (m/s2) 1.0 E-02
gallon [Canadian and U.K. (Imperial)] (gal) cubic meter (m3) 4.546 09 E-03
gallon [Canadian and U.K. (Imperial)] (gal) liter (L) 4.546 09 E+00
gallon (U.S.) (gal) cubic meter (m3) 3.785 412 E-03
gallon (U.S.) (gal) liter (L) 3.785 412 E+00
gallon (U.S.) per day (gal/d) cubic meter per second (m3/s) 4.381 264 E-08
gallon (U.S.) per day (gal/d) liter per second (L/s) 4.381 264 E-05
gallon (U.S.) per horsepower hour [gal/(hp · h)] cubic meter per joule (m3/J) 1.410 089 E-09
gallon (U.S.) per horsepower hour [gal/(hp · h)] liter per joule (L/J) 1.410 089 E-06
gallon (U.S.) per minute (gpm) (gal/min) cubic meter per second (m3/s) 6.309 020 E-05
gallon (U.S.) per minute (gpm) (gal/min) liter per second (L/s) 6.309 020 E-02
gamma (γ) tesla (T) 1.0 E-09
gauss (Gs, G) tesla (T) 1.0 E-04
gilbert (Gi) ampere (A) 7.957 747 E-01
gill [Canadian and U.K. (Imperial)] (gi) cubic meter (m3) 1.420 653 E-04
gill [Canadian and U.K. (Imperial)] (gi) liter (L) 1.420 653 E-01
gill (U.S.) (gi) cubic meter (m3) 1.182 941 E-04
gill (U.S.) (gi) liter (L) 1.182 941 E-01
gon (also called grade) (gon) radian (rad) 1.570 796 E-02
gon (also called grade) (gon) degree (angle) (°) 9.0 E-01
grain (gr) kilogram (kg) 6.479 891 E-05
grain (gr) milligram (mg) 6.479 891 E+01
grain per gallon (U.S.) (gr/gal) kilogram per cubic meter (kg/m3) 1.711 806 E-02
grain per gallon (U.S.) (gr/gal) milligram per liter (mg/L) 1.711 806 E+01
gram-force per square centimeter (gf/cm2) pascal (Pa) 9.806 65 E+01
gram per cubic centimeter (g/cm3) kilogram per cubic meter (kg/m3) 1.0 E+03

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H
To convert from to Multiply by
hectare (ha) square meter (m2) 1.0 E+04
horsepower (550 ft · lbf/s) (hp) watt (W) 7.456 999 E+02
horsepower (boiler) watt (W) 9.809 50 E+03
horsepower (electric) watt (W) 7.46 E+02
horsepower (metric) watt (W) 7.354 988 E+02
horsepower (U.K.) watt (W) 7.4570 E+02
horsepower (water) watt (W) 7.460 43 E+02
hour (h) second (s) 3.6 E+03
hour (sidereal) second (s) 3.590 170 E+03
hundredweight (long, 112 lb) kilogram (kg) 5.080 235 E+01
hundredweight (short, 100 lb) kilogram (kg) 4.535 924 E+01

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I
To convert from to Multiply by
inch (in) meter (m) 2.54 E-02
inch (in) centimeter (cm) 2.54 E+00
inch of mercury (32 °F) 12 pascal (Pa) 3.386 38 E+03
inch of mercury (32 °F) 12 kilopascal (kPa) 3.386 38 E+00
inch of mercury (60 °F) 12 pascal (Pa) 3.376 85 E+03
inch of mercury (60 °F) 12 kilopascal (kPa) 3.376 85 E+00
inch of mercury, conventional (inHg) 12 pascal (Pa) 3.386 389 E+03
inch of mercury, conventional (inHg) 12 kilopascal (kPa) 3.386 389 E+00
inch of water (39.2 °F) 12 pascal (Pa) 2.490 82 E+02
inch of water (60 °F) 12 pascal (Pa) 2.4884 E+02
inch of water, conventional (inH2O) 12 pascal (Pa) 2.490 889 E+02
inch per second (in/s) meter per second (m/s) 2.54 E-02
inch per second squared (in/s2) meter per second squared (m/s2) 2.54 E-02
inch to the fourth power (in4) 16 meter to the fourth power (m4) 4.162 314 E-07

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K
To convert from to Multiply by
kayser (K) reciprocal meter (m-1) 1.0 E+02
kelvin (K) degree Celsius (°C) t/°C = T/K - 273.15
kilocalorieIT (kcalIT) joule (J) 4.1868 E+03
kilocalorieth (kcalth) joule (J) 4.184 E+03
kilocalorie (mean) (kcal) joule (J) 4.190 02 E+03
kilocalorieth per minute (kcalth/min) watt (W) 6.973 333 E+01
kilocalorieth per second (kcalth/s) watt (W) 4.184 E+03
kilogram-force (kgf) newton (N) 9.806 65 E+00
kilogram-force meter (kgf · m) newton meter (N · m) 9.806 65 E+00
kilogram-force per square centimeter (kgf/cm2) pascal (Pa) 9.806 65 E+04
kilogram-force per square centimeter (kgf/cm2) kilopascal (kPa) 9.806 65 E+01
kilogram-force per square meter (kgf/m2) pascal (Pa) 9.806 65 E+00
kilogram-force per square millimeter (kgf/mm2) pascal (Pa) 9.806 65 E+06
kilogram-force per square millimeter (kgf/mm2) megapascal (MPa) 9.806 65 E+00
kilogram-force second squared per meter (kgf · s2/m) kilogram (kg) 9.806 65 E+00
kilometer per hour (km/h) meter per second (m/s) 2.777 778 E-01
kilopond (kilogram-force) (kp) newton (N) 9.806 65 E+00
kilowatt hour (kW · h) joule (J) 3.6 E+06
kilowatt hour (kW · h) megajoule (MJ) 3.6 E+00
kip (1 kip= 1000 lbf) newton (N) 4.448 222 E+03
kip (1 kip= 1000 lbf) kilonewton (kN) 4.448 222 E+00
kip per square inch (ksi) (kip/in2) pascal (Pa) 6.894 757 E+06
kip per square inch (ksi) (kip/in2) kilopascal (kPa) 6.894 757 E+03
knot (nautical mile per hour) meter per second (m/s) 5.144 444 E-01

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L
To convert from to Multiply by
lambert 17 candela per square meter (cd/m2) 3.183 099 E+03
langley (calth/cm2) joule per square meter (J/m2) 4.184 E+04
light year (l.y.) 18 meter (m) 9.460 73 E+15
liter (L) 19 cubic meter (m3) 1.0 E-03
lumen per square foot (lm/ft2) lux (lx) 1.076 391 E+01

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M
To convert from to Multiply by
maxwell (Mx) weber (Wb) 1.0 E-08
mho siemens (S) 1.0 E+00
microinch meter (m) 2.54 E-08
microinch micrometer (μm) 2.54 E-02
micron (μ) meter (m) 1.0 E-06
micron (μ) micrometer (μm) 1.0 E+00
mil (0.001 in) meter (m) 2.54 E-05
mil (0.001 in) millimeter (mm) 2.54 E-02
mil (angle) radian (rad) 9.817 477 E-04
mil (angle) degree (°) 5.625 E-02
mile (mi) meter (m) 1.609 344 E+03
mile (mi) kilometer (km) 1.609 344 E+00
mile (based on U.S. survey foot) (mi) 7 meter (m) 1.609 347 E+03
mile (based on U.S. survey foot) (mi) 7 kilometer (km) 1.609 347 E+00
mile, nautical 20 meter (m) 1.852 E+03
mile per gallon (U.S.) (mpg) (mi/gal) meter per cubic meter (m/m3) 4.251 437 E+05
mile per gallon (U.S.) (mpg) (mi/gal) kilometer per liter (km/L) 4.251 437 E-01
mile per gallon (U.S.) (mpg) (mi/gal) 21 liter per 100 kilometer (L/100 km) divide 235.215 by number of miles per gallon
mile per hour (mi/h) meter per second (m/s) 4.4704 E-01
mile per hour (mi/h) kilometer per hour (km/h) 1.609 344 E+00
mile per minute (mi/min) meter per second (m/s) 2.682 24 E+01
mile per second (mi/s) meter per second (m/s) 1.609 344 E+03
millibar (mbar) pascal (Pa) 1.0 E+02
millibar (mbar) kilopascal (kPa) 1.0 E-01
millimeter of mercury, conventional (mmHg) 12 pascal (Pa) 1.333 224 E+02
millimeter of water, conventional (mm H2O) 12 pascal (Pa) 9.806 65 E+00
minute (angle) (′) radian (rad) 2.908 882 E-04
minute (min) second (s) 6.0 E+01
minute (sidereal) second (s) 5.983 617 E+01

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O
To convert from to Multiply by
oersted (Oe) ampere per meter (A/m) 7.957 747 E+01
ohm centimeter (Ω · cm) ohm meter (Ω · m) 1.0 E-02
ohm circular-mil per foot ohm meter (Ω · m) 1.662 426 E-09
ohm circular-mil per foot ohm square millimeter per meter (Ω · mm2/m) 1.662 426 E-03
ounce (avoirdupois) (oz) kilogram (kg) 2.834 952 E-02
ounce (avoirdupois) (oz) gram (g) 2.834 952 E+01
ounce (troy or apothecary) (oz) kilogram (kg) 3.110 348 E-02
ounce (troy or apothecary) (oz) gram (g) 3.110 348 E+01
ounce [Canadian and U.K. fluid (Imperial)] (fl oz) cubic meter (m3) 2.841 306 E-05
ounce [Canadian and U.K. fluid (Imperial)] (fl oz) milliliter (mL) 2.841 306 E+01
ounce (U.S. fluid) (fl oz) cubic meter (m3) 2.957 353 E-05
ounce (U.S. fluid) (fl oz) milliliter (mL) 2.957 353 E+01
ounce (avoirdupois)-force (ozf) newton (N) 2.780 139 E-01
ounce (avoirdupois)-force inch (ozf · in) newton meter (N · m) 7.061 552 E-03
ounce (avoirdupois)-force inch (ozf · in) millinewton meter (mN · m) 7.061 552 E+00
ounce (avoirdupois) per cubic inch (oz/in3) kilogram per cubic meter (kg/m3) 1.729 994 E+03
ounce (avoirdupois) per gallon [Canadian and U.K. (Imperial)] (oz/gal) kilogram per cubic meter (kg/m3) 6.236 023 E+00
ounce (avoirdupois) per gallon [Canadian and U.K. (Imperial)] (oz/gal) gram per liter (g/L) 6.236 023 E+00
ounce (avoirdupois) per gallon (U.S.) (oz/gal) kilogram per cubic meter (kg/m3) 7.489 152 E+00
ounce (avoirdupois) per gallon (U.S.) (oz/gal) gram per liter (g/L) 7.489 152 E+00
ounce (avoirdupois) per square foot (oz/ft2) kilogram per square meter (kg/m2) 3.051 517 E-01
ounce (avoirdupois) per square inch (oz/in2) kilogram per square meter (kg/m2) 4.394 185 E+01
ounce (avoirdupois) per square yard (oz/yd2) kilogram per square meter (kg/m2) 3.390 575 E-02

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P
To convert from to Multiply by
parsec (pc) meter (m) 3.085 678 E+16
peck (U.S.) (pk) cubic meter (m3) 8.809 768 E-03
peck (U.S.) (pk) liter (L) 8.809 768 E+00
pennyweight (dwt) kilogram (kg) 1.555 174 E-03
pennyweight (dwt) gram (g) 1.555 174 E+00
perm (0 °C) kilogram per pascal second square meter [kg/(Pa · s · m2)] 5.721 35 E-11
perm (23 °C) kilogram per pascal second square meter [kg/(Pa · s · m2)] 5.74525 E-11
perm inch (0 °C) kilogram per pascal second meter [kg/(Pa·s·m)] 1.45322 E-12
perm inch (23 °C) kilogram per pascal second meter [kg/(Pa·s·m)] 1.45929 E-12
phot (ph) lux (lx) 1.0 E+04
pica (computer) (1/6 in) meter (m) 4.233 333 E-03
pica (computer) (1/6 in) millimeter (mm) 4.233 333 E+00
pica (printer's) meter (m) 4.217 518 E-03
pica (printer's) millimeter (mm) 4.217 518 E+00
pint (U.S. dry) (dry pt) cubic meter (m3) 5.506 105 E-04
pint (U.S. dry) (dry pt) liter (L) 5.506 105 E-01
pint (U.S. liquid) (liq pt) cubic meter (m3) 4.731 765 E-04
pint (U.S. liquid) (liq pt) liter (L) 4.731 765 E-01
point (computer) (1/72 in) meter (m) 3.527 778 E-04
point (computer) (1/72 in) millimeter (mm) 3.527 778 E-01
point (printer's) meter (m) 3.514 598 E-04
point (printer's) millimeter (mm) 3.514 598 E-01
poise (P) pascal second (Pa · s) 1.0 E-01
pound (avoirdupois) (lb) 22 kilogram (kg) 4.535 924 E-01
pound (troy or apothecary) (lb) kilogram (kg) 3.732 417 E-01
poundal newton (N) 1.382 550 E-01
poundal per square foot pascal (Pa) 1.488 164 E+00
poundal second per square foot pascal second (Pa · s) 1.488 164 E+00
pound foot squared (lb · ft2) kilogram meter squared (kg · m2) 4.214 011 E-02
pound-force (lbf) 23 newton (N) 4.448 222 E+00
pound-force foot (lbf · ft) newton meter (N · m) 1.355 818 E+00
pound-force foot per inch (lbf · ft/in) newton meter per meter (N · m/m) 5.337 866 E+01
pound-force inch (lbf · in) newton meter (N · m) 1.129 848 E-01
pound-force inch per inch (lbf · in/in) newton meter per meter (N · m/m) 4.448 222 E+00
pound-force per foot (lbf/ft) newton per meter (N/m) 1.459 390 E+01
pound-force per inch (lbf/in) newton per meter (N/m) 1.751 268 E+02
pound-force per pound (lbf/lb) (thrust to mass ratio) newton per kilogram (N/kg) 9.806 65 E+00
pound-force per square foot (lbf/ft2) pascal (Pa) 4.788 026 E+01
pound-force per square inch (psi) (lbf/in2) pascal (Pa) 6.894 757 E+03
pound-force per square inch (psi) (lbf/in2) kilopascal (kPa) 6.894 757 E+00
pound-force second per square foot (lbf · s/ft2) pascal second (Pa · s) 4.788 026 E+01
pound-force second per square inch (lbf · s/in2) pascal second (Pa · s) 6.894 757 E+03
pound inch squared (lb · in2) kilogram meter squared (kg ·m2) 2.926 397 E-04
pound per cubic foot (lb/ft3) kilogram per cubic meter (kg/m3) 1.601 846 E+01
pound per cubic inch (lb/in3) kilogram per cubic meter (kg/m3) 2.767 990 E+04
pound per cubic yard (lb/yd3) kilogram per cubic meter (kg/m3) 5.932 764 E-01
pound per foot (lb/ft) kilogram per meter (kg/m) 1.488 164 E+00
pound per foot hour [lb/(ft · h)] pascal second (Pa · s) 4.133 789 E-04
pound per foot second [lb/(ft · s)] pascal second (Pa · s) 1.488 164 E+00
pound per gallon [Canadian and U.K. (Imperial)] (lb/gal) kilogram per cubic meter (kg/m3) 9.977 637 E+01
pound per gallon [Canadian and U.K. (Imperial)] (lb/gal) kilogram per liter (kg/L) 9.977 637 E-02
pound per gallon (U.S.) (lb/gal) kilogram per cubic meter (kg/m3) 1.198 264 E+02
pound per gallon (U.S.) (lb/gal) kilogram per liter (kg/L) 1.198 264 E-01
pound per horsepower hour [lb/(hp · h)] kilogram per joule (kg/J) 1.689 659 E-07
pound per hour (lb/h) kilogram per second (kg/s) 1.259 979 E-04
pound per inch (lb/in) kilogram per meter (kg/m) 1.785 797 E+01
pound per minute (lb/min) kilogram per second (kg/s) 7.559 873 E-03
pound per second (lb/s) kilogram per second (kg/s) 4.535 924 E-01
pound per square foot (lb/ft2) kilogram per square meter (kg/m2) 4.882 428 E+00
pound per square inch (not pound-force) (lb/in2) kilogram per square meter (kg/m2) 7.030 696 E+02
pound per yard (lb/yd) kilogram per meter (kg/m) 4.960 546 E-01
psi (pound-force per square inch) (lbf/in2) pascal (Pa) 6.894 757 E+03
psi (pound-force per square inch) (lbf/in2) kilopascal (kPa) 6.894 757 E+00

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Q
To convert from to Multiply by
quad (1015 BtuIT) 11 joule (J) 1.055 056 E+18
quart (U.S. dry) (dry qt) cubic meter (m3) 1.101 221 E-03
quart (U.S. dry) (dry qt) liter (L) 1.101 221 E+00
quart (U.S. liquid) (liq qt) cubic meter (m3) 9.463 529 E-04
quart (U.S. liquid) (liq qt) liter (L) 9.463 529 E-01

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R
To convert from to Multiply by
rad (absorbed dose) (rad) gray (Gy) 1.0 E-02
rem (rem) sievert (Sv) 1.0 E-02
revolution (r) radian (rad) 6.283 185 E+00
revolution per minute (rpm) (r/min) radian per second (rad/s) 1.047 198 E-01
rhe reciprocal pascal second (Pa · s)-1 1.0 E+01
rod (based on U.S. survey foot) (rd) 7 meter (m) 5.029 210 E+00
roentgen (R) coulomb per kilogram (C/kg) 2.58 E-04
rpm (revolution per minute) (r/min) radian per second (rad/s) 1.047 198 E-01

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S
To convert from to Multiply by
second (angle) (″) radian (rad) 4.848 137 E-06
second (sidereal) second (s) 9.972 696 E-01
shake second (s) 1.0 E-08
shake nanosecond (ns) 1.0 E+01
slug (slug) kilogram (kg) 1.459 390 E+01
slug per cubic foot (slug/ft3) kilogram per cubic meter (kg/m3) 5.153 788 E+02
slug per foot second [slug/(ft · s)] pascal second (Pa · s) 4.788 026 E+01
square foot (ft2) square meter (m2) 9.290 304 E-02
square foot per hour (ft2/h) square meter per second (m2/s) 2.580 64 E-05
square foot per second (ft2/s) square meter per second (m2/s) 9.290 304 E-02
square inch (in2) square meter (m2) 6.4516 E-04
square inch (in2) square centimeter (cm2) 6.4516 E+00
square mile (mi2) square meter (m2) 2.589 988 E+06
square mile (mi2) square kilometer (km2) 2.589 988 E+00
square mile (based on U.S. survey foot) (mi2) 7 square meter (m2) 2.589 998 E+06
square mile (based on U.S. survey foot) (mi2) 7 square kilometer (km2) 2.589 998 E+00
square yard (yd2) square meter (m2) 8.361 274 E-01
statampere ampere (A) 3.335 641 E-10
statcoulomb coulomb (C) 3.335 641 E-10
statfarad farad (F) 1.112 650 E-12
stathenry henry (H) 8.987 552 E+11
statmho siemens (S) 1.112 650 E-12
statohm ohm (Ω) 8.987 552 E+11
statvolt volt (V) 2.997 925 E+02
stere (st) cubic meter (m3) 1.0 E+00
stilb (sb) candela per square meter (cd/m2) 1.0 E+04
stokes (St) meter squared per second (m2/s) 1.0 E-04

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T
To convert from to Multiply by
tablespoon cubic meter (m3) 1.478 676 E-05
tablespoon milliliter (mL) 1.478 676 E+01
teaspoon cubic meter (m3) 4.928 922 E-06
teaspoon milliliter (mL) 4.928 922 E+00
tex kilogram per meter (kg/m) 1.0 E-06
therm (EC) 24 joule (J) 1.055 06 E+08
therm (U.S.) 24 joule (J) 1.054 804 E+08
ton, assay (AT) kilogram (kg) 2.916 667 E-02
ton, assay (AT) gram (g) 2.916 667 E+01
ton-force (2000 lbf) newton (N) 8.896 443 E+03
ton-force (2000 lbf) kilonewton (kN) 8.896 443 E+00
ton, long (2240 lb) kilogram (kg) 1.016 047 E+03
ton, long, per cubic yard kilogram per cubic meter (kg/m3) 1.328 939 E+03
ton, metric (t) kilogram (kg) 1.0 E+03
tonne (called "metric ton" in U.S.) (t) kilogram (kg) 1.0 E+03
ton of refrigeration (12 000 BtuIT/h) watt (W) 3.516 853 E+03
ton of TNT (energy equivalent) 25 joule (J) 4.184 E+09
ton, register cubic meter (m3) 2.831 685 E+00
ton, short (2000 lb) kilogram (kg) 9.071 847 E+02
ton, short, per cubic yard kilogram per cubic meter (kg/m3) 1.186 553 E+03
ton, short, per hour kilogram per second (kg/s) 2.519 958 E-01
torr (Torr) pascal (Pa) 1.333 224 E+02

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U
To convert from to Multiply by
unit pole weber (Wb) 1.256 637 E-07

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W
To convert from to Multiply by
watt hour (W · h) joule (J) 3.6 E+03
watt per square centimeter (W/cm2) watt per square meter (W/m2) 1.0 E+04
watt per square inch (W/in2) watt per square meter (W/m2) 1.550 003 E+03
watt second (W · s) joule (J) 1.0 E+00

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Y
To convert from to Multiply by
yard (yd) meter (m) 9.144 E-01
year (365 days) second (s) 3.1536 E+07
year (sidereal) second (s) 3.155 815 E+07
year (tropical) second (s) 3.155 693 E+07
Metrology
Created February 1, 2016, Updated August 18, 2025
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