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Energy
Unit Name Symbol SI Equivalent 
· a.u. of energy 
Eh  4.35975x10-18 J 
· barrel oil equivalent 
bboe  6.12x109 J 
· bboe (barrel oil equivalent) 
bboe  6.12x109 J 
· BeV (billion eV) 
BeV  1.60218x10-10 J 
· British thermal unit (ISO) 
Btu (ISO)  1055.06 J 
· British thermal unit (IT) 
Btu (IT)  1055.06 J 
· British thermal unit (mean) 
Btu (mean)  1055.87 J 
· British thermal unit (thermochemical) 
Btu (therm.)  1054.35 J 
· calorie (15°C) 
cal15  4.185 J 
· calorie (4°C) 
cal4  4.2045 J 
· Calorie (diet kilocalorie) 
Cal, kcal  4180 J 
· calorie (IT) (International Steam Table) 
cal (IT)  4.18674 J 
· calorie (mean) 
calmean  4.19002 J 
· calorie (thermochemical) 
cal (therm.)  4.184 J 
· Celsius-heat unit 
Chu  1899.18 J 
· coulomb volt 
C-V  1 J 
· cubic centimeter-atm 
cm3-atm  0.101325 J 
· cubic foot atm 
ft3-atm  2869.2 J 
· electronvolt 
eV  1.60218x10-19 J 
· erg 
erg  1x10-7 J 
· foot-pound force 
ft-lbf  1.35582 J 
· foot-poundal 
ft-pdl  4.21401x10-2 J 
· gigaelectronvolt 
GeV  1.60218x10-10 J 
· gram calorie 
gram-cal  4.18674 J 
· hartree 
Eh  4.35975x10-18 J 
· horsepower (550ft-lbf/s)-hour 
Hp-h  2.68452x106 J 
· inch pound force 
in-lbf  0.112985 J 
· joule 
J  1 J 
· kilocalorie (15°C) 
kcal15  4185.5 J 
· kilocalorie (4°C) 
kcal4  4204.5 J 
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