Guide for the Use of the International System of Units (SI)

 
ENERGY (includes WORK) 
British thermal unit
IT
(Btu
IT
)
9
.............................. joule (J) ................................................. 1.055 056 E+03 
British thermal unit
th
(Btu
th
)
9
............................... joule (J) ................................................. 1.054 350 E+03 
British thermal unit (mean) (Btu) ........................ joule (J) ................................................... 1.055 87 E+03 
British thermal unit (39 ºF) (Btu) ........................ joule (J) ................................................... 1.059 67 E+03 
British thermal unit (59 ºF) (Btu) ........................ joule (J) ................................................... 1.054 80 E+03 
British thermal unit (60 ºF) (Btu) ........................ joule (J) ................................................... 1.054 68 E+03 
calorie
IT
(cal
IT
)
10
.................................................. joule (J) ...................................................... 4.1868 E+00 
calorie
th
(cal
th
)
10 
.................................................... joule (J) ........................................................ 4.184 E+00 
calorie (mean) (cal) .............................................. joule (J) ................................................... 4.190 02 E+00 
calorie (15 ºC) (cal
15
) ........................................... joule (J) ................................................... 4.185 80 E+00 
calorie (20 ºC) (cal
20
) ........................................... joule (J) ................................................... 4.181 90 E+00 
calorie
IT
, kilogram (nutrition)
11
 ........................... joule (J) ...................................................... 4.1868 E+03 
calorie
th
, kilogram (nutrition)
11
............................ joule (J) ........................................................ 4.184 E+03 
calorie (mean), kilogram (nutrition)
11
 .................. joule (J) ................................................... 4.190 02 E+03 
electronvolt (eV) .................................................. joule (J) ................................................. 1.602 176 E−19 
erg (erg) ............................................................... joule (J) ............................................................ 1.0 E−07 
foot poundal.......................................................... joule (J) ................................................. 4.214 011 E−02 

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