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Factors in boldface are exact
Conversion Factors for HEAT
Available Energy
To Convert From To Multiply By
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 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
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
Coefficient of Heat Transfer
To Convert From To Multiply By
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 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
Density of Heat
To Convert From To Multiply By
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
calorieth per square centimeter (calth/cm²) joule per square meter (J/m²) 4.184 E+04
langley (calth/cm²) joule per square meter (J/m²) 4.184 E+04
Density of Heat Flow Rate
To Convert From To Multiply By
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
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
Fuel Consumption (see fuel consumption calculator in Index)
To Convert From To Multiply By
gallon (U.S.) per horsepower hour[gal/(hp·h)] cubic meter per joule (m/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
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) liter per 100 kilometer (L/100km) divide 235.215
by number of miles per gallon
pound per horsepower hour [lb/(hp·h)] kilogram per joule (kg/J) 1.689 659 E-07
Heat Capacity and Entropy
To Convert From To Multiply By
British thermal unitIT per deg. Fahrenheit(BtuIT/°F) joule per kelvin (J/k) 1.899 101 E+03
British thermal unitth per deg. 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
Heat Flow Rate
To Convert From To Multiply By
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 unitth per minute(Btuth/min) watt (W) 1.757 250 E+01
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
calorieth per minute(calth/min) watt (W) 6.973 333 E-02
calorieth per second(calth/s) watt (W) 4.184 E+00
kilocalorieth per minute(kcalth/min) watt (W) 6.973 333 E+01
kilocalorieth per second(kcalth/s) watt (W) 4.184 E+03
ton of refrigeration(12 000 BtuIT/h) watt (W) 3.516 853 E+03
Specific Heat Capacity and Specific Entropy
To Convert From To Multiply By
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
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
Thermal Conductivity
To Convert From To Multiply By
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
calorieth per centimeter second degree Celsius
[calth/(cm·s·°C)] watt per meter kelvin [W/(m·K)] 4.184 E+02
Thermal Diffusivity
To Convert From To Multiply By
square foot per hour (ft²/h) square meter per second (m²/s) 2.580 64 E-05
Thermal Insulance
To Convert From To Multiply By
clo square meter kelvin per watt (m²·K/W) 1.55 E-01
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
Thermal Resistance
To Convert From To Multiply By
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 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
Thermal Resistivity
To Convert From To Multiply By
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+04
The exact conversion factor for the International Table Btu is BtuIT 1.055 055 852 62 kJ.
British thermal unitIT the notation for International Table used in this listing
British thermal unitth The notation for thermochemical.