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Physics > Thermal Units and Equivalents


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Thermal conductance (total)

Unit Name Symbol SI Equivalent
watt per kelvin
W/K 1 W/K

Thermal conductivity

Unit Name Symbol SI Equivalent
British thermal unit (IT) per foot per hour per Fahrenheit degree
Btu (IT)/ft-h-°F 1.73073 W/m-K
British thermal unit (IT)-inch per square foot per hour per Fahrenheit degree
Btu (IT)-in/h-ft2-°F 0.144228 W/m-K
British thermal unit (IT)-inch per square foot per second per Fahrenheit degree
Btu (IT)-in/s-ft2-°F 519.22 W/m-K
British thermal unit (therm.) per foot per hour per Fahrenheit degree
Btu (therm.)/ft-h-°F 1.72958 W/m-K
British thermal unit (therm.)-inch per square foot per hour per Fahrenheit degree
Btu (therm.)-in/h-ft2-°F 0.144131 W/m-K
British thermal unit (therm.)-inch per square foot per second per Fahrenheit degree
Btu (therm.)-in/s-ft2-°F 518.873 W/m-K
calorie (IT) per centimeter per second per degree Celsius
cal (IT)/cm-s-°C 418.673 W/m-K
calorie (therm.) per centimeter per second per degree Celsius
cal (therm.)/cm-s-°C 418.4 W/m-K
watt per centimeter per celsius degree
W/cm-°C 100 W/m-K
watt per meter per Celsius degree
W/m-°C 1 W/m-K
watt per meter per kelvin
W/m-K 1 W/m-K

Thermal expansion coefficient

Unit Name Symbol SI Equivalent
microinch per inch per Fahrenheit degree
µin/in-°F 1.8x10-6 /K
micron per meter per Celsius degree
µm/m-°C 1x10-6 /K
per Celsius degree
/°C 1 /K
per Fahrenheit degree
/°F 1.8 /K
per Kelvin
/K 1 /K

Thermal heat capacity


Unit Name Symbol SI Equivalent
British thermal unit (IT) per pound mass
Btu (IT)/lbm 2326 J/kg
British thermal unit (therm.) per pound mass
Btu (therm.)/lbm 2324.44 J/kg
calorie (IT) per gram
cal (IT)/g 4186.74 J/kg
calorie (therm.) per gram
cal (therm.)/g 4184 J/kg
joule per gram
J/g 1000 J/kg
joule per kilogram
J/kg 1 J/kg
kilocalorie (IT) per kilogram
Cal (IT)/kg, kcal/kg 4186.74 J/kg
kilowatt-hour per kilogram
kWh/kg 3.6x106 J/kg

Thermal heat transfer coefficient

Unit Name Symbol SI Equivalent
British thermal unit (IT) per square foot per hour per Fahrenheit degree
Btu (IT)/h-ft2-°F 5.67826 W/m2-K
British thermal unit (therm.) per square foot per hour per Fahrenheit degree
Btu (therm.)/h-ft2-°F 5.67446 W/m2-K
watt per square centimeter per kelvin
W/cm2-K 1x10 4 W/m2-K
watt per square meter per degree celcius
W/m2-°C 1 W/m2-K
watt per square meter per kelvin
W/m2-K 1 W/m2-K