Summary: Btu to joule, watt, erg, foot pounds conversion factors and data on British thermal units

Btu Tables

 
Btu Conversions
 
Put simply, one British Thermal Unit [Btu] is the amount of heat required to raise the temperature of
1 pound [ lb.] of water 1 degree Fahrenheit.
The Fifth International Conference on the Properties of Steam (London, July 1956) defined the International Table calorie as 4.1868 joule.
Therefore the exact conversion factor for the International Table British thermal unit (Btu) is 1.05505585262 kJ.
The thermochemical Btu is based on the thermochemical calorie which equals 4.184 joule exactly.

Note that reference is often made to the calorie when in actual fact the kilocalorie (also called Calorie, large calorie or kilogram calorie) is meant. (1 kilocalorie = 1000 calories)
These units multiplied by ...... ..this factor will... ..convert to these units.
Btu 1.06E+10 ergs
Btu 778.3 foot-lbs
Btu 252 gram-calories
Btu 0.0003931 horsepower-hrs
Btu (39 �F) 1059.67 joules (J)
Btu (59 �F) 1054.8 joules
Btu (60 �F) 1054.68 joules
Btu (international table) 1055.056 joules
Btu (thermochemical) 1054.35 joules
Btu 0.252 kilogram-calories
Btu 107.5 kilogram-metres
Btu 0.0002928 kilowatt-hrs
Btu /hr 0.2162 foot-pounds/sec
Btu /hr 0.07 gram-cal/sec
Btu /hr 0.0003929 horsepower-hrs
Btu (int)/hr 0.2930711 watts
Btu (thermo)/hr 0.2928751 watts
Btu /min 12.96 foot-lbs/sec
Btu /min 0.02356 horsepower
Btu /min 0.01757 kilowatts
Btu(thermo)/min 17.5725 watts
Btu (int)/sec 1055.056 watts
Btu (thermo)/sec 1054.35 watts
Btu (thermo) /sq. ft. min 189.1489 watts /sq. metre
Btu (int) /sq. ft. sec 11356.53 watts /sq. metre
Btu (thermo) /sq. ft. sec 11348.93 watts /sq. metre
Btu (thermo) /sq. in. sec 1.634246E+06 watts /sq. metre
Btu (int) ft./hr sq.ft. �F 1.730735 watt per metre kelvin
Btu (thermo) ft./hr sq.ft. �F 1.729577 watt per metre kelvin
Btu (int) in /hr sq.ft. �F 0.1442279 watt per metre kelvin
Btu (thermo) in./hr sq.ft. �F 0.1441314 watt per metre kelvin
Btu (int) in /sec sq.ft. �F 519.2204 watt per metre kelvin
Btu (thermo) in./hr sq.ft. �F 518.8732 watt per metre kelvin
Btu (int) per cu. ft. 37258.95 joule per cu. metre
Btu (thermo) per cu. ft. 37234.03 joule per cu. metre
Btu (int) per �F 1899.101 joule per kelvin
Btu (thermo) per �F 1897.83 joule per kelvin
Btu (int) per �Rankine 1899.101 joule per kelvin
Btu (thermo) per �R 1897.83 joule per kelvin
Btu (int /cu.ft. �F 67066.07 joule per cu. metre kelvin
Btu (int) /hr sq.ft. �F 5.678263 watt per sq. metre kelvin
Btu (thermo) /hr sq.ft. �F 5.674466 watt per sq. metre kelvin
Btu (int) /sec sq.ft. �F 20441.75 watt per sq. metre kelvin
Btu (thermo) /sec sq.ft. �F 20428.08 watt per sq. metre kelvin
Btu (int) /lb 2326 joule per kg.
Btu (thermo) /lb 2324.444 joule per kg.
Btu (int) /lb 0.64616 watts per kilogram
Btu (int) /lb 0.55498 kilocalorie per kilogram
Btu (int) /lb. �F 4186.8 joul per kg kelvin
Btu (thermo) /lb. �F 4184 joul per kg kelvin
Btu (int) /lb. �Rankine 4186.8 joul per kg kelvin
Btu (thermo) /lb. �R 4184 joul per kg kelvin
Btu (int) /sq. ft 11356.53 joul per sq. metre
Btu (thermo) /sq. ft. 11348.93 joul per sq. metre
Btu (int) /sq. ft. hr 3.154591 watt per sq. metre
Btu (thermo) /sq. ft. hr 3.152481 watt per sq. metre
~~~~ ~~~~ ~~~~
calorie, gram (mean) 0.00396832 Btu (mean)
~~~~ ~~~~ ~~~~
ergs 9.48E-11 Btu
ergs/sec 5.69E-06 Btu/min
~~~~ ~~~~ ~~~~
foot-pounds 0.001286 Btu
foot-pounds/min 0.001286 Btu/min
foot-pounds/sec 4.6263 Btu/hr
foot-pounds/sec 0.07717 Btu/min
~~~~ ~~~~ ~~~~
gram-calories 0.0039683 Btu
gram-calories/sec 14.286 Btu/hr
gram-calories 9.30E-08 Btu
~~~~ ~~~~ ~~~~
horsepower 42.44 Btu/min
horsepower (boiler) 33479 Btu/hr
horsepower-hrs 2547 Btu
~~~~ ~~~~ ~~~~
joules 9.48E-04 Btu
~~~~ ~~~~ ~~~~
kilogram-calories 3.968 Btu
kilogram-metres 9.29E-03 Btu
kilowatts 56.92 Btu/min
kilowatt-hrs 3413 Btu
~~~~ ~~~~ ~~~~
tons refrigeration 12000 Btu per hour
~~~~ ~~~~ ~~~~
watts 3.4129 Btu/hr
watts 0.05688 Btu/min
watts (absolute) 0.056884 Btu (mean)/min
watt-hours 3.413 Btu
These units multiplied by ...... ..this factor will... ..convert to these units.

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last modified : 7th. September 2007

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