http://www.simetric.co.uk/si_hij.htm
joules   9.48E-04 Btu
joules  10000000 ergs
joules  0.7376 foot-pounds
joules  0.0002389 kg-calories
joules  0.102 kg-metres
joules  0.0002778 watt-hrs
horsepower   42.44 Btu/min
horsepower  33000 foot-lbs/min
horsepower  550 foot-lbs/sec
horsepower (metric)  0.9863 horsepower
horsepower  10.68 kg-calories/min
horsepower  0.7457 kilowatts
horsepower (boiler)  33479 Btu/hr
horsepower (boiler)  9809.5 watts
horsepower (metric)  735.4988 watts
horsepower (electric)  746 watts
horsepower  see tables  cc and cu.in. (approx)
horsepower (UK)  745.7 watts
horsepower (water)  746.043 watts
horsepower-hrs  2547 Btu
horsepower-hrs  2.68E+13 ergs
horsepower-hrs  1980000 foot-lbs
horsepower-hrs  641190 gram-calories
horsepower-hrs  2684000 joules
horsepower-hrs  641.1 kg-calories
horsepower-hrs  273700 kg-metres
horsepower-hrs  0.7457 kilowatt-hrs
To obtain joules when watt-hours are known, multiply by 3,600. To obtain watt-hours when joules are known, multiply by 2.778 x 10 to the power of 4.
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 ºF)  1059.67 joules (J)
Btu (59 ºF)  1054.8 joules
Btu (60 ºF)  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  1.63E+06 watts /sq. metre
Btu (int) ft./hr sq.ft. ºF  1.730735 watt per metre kelvin
Btu (thermo) ft./hr sq.ft. ºF  1.729577 watt per metre kelvin
Btu (int) in /hr sq.ft. ºF  0.1442279 watt per metre kelvin
Btu (thermo) in./hr sq.ft. ºF  0.1441314 watt per metre kelvin
Btu (int) in /sec sq.ft. ºF  519.2204 watt per metre kelvin
Btu (thermo) in./hr sq.ft. ºF  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 ºF  1899.101 joule per kelvin
Btu (thermo) per ºF  1897.83 joule per kelvin
Btu (int) per ºRankine  1899.101 joule per kelvin
Btu (thermo) per ºR  1897.83 joule per kelvin
Btu (int /cu.ft. ºF  67066.07 joule per cu. metre kelvin
Btu (int) /hr sq.ft. ºF  5.678263 watt per sq. metre kelvin
Btu (thermo) /hr sq.ft. ºF  5.674466 watt per sq. metre kelvin
Btu (int) /sec sq.ft. ºF  20441.75 watt per sq. metre kelvin
Btu (thermo) /sec sq.ft. ºF  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. ºF  4186.8 joul per kg kelvin
Btu (thermo) /lb. ºF  4184 joul per kg kelvin
Btu (int) /lb. ºRankine  4186.8 joul per kg kelvin
Btu (thermo) /lb. ºR  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