| Unit | Symbol | Definition | Conversion to SI units |
| barrel of oil equivalent |
bboe |
~ 5.8 x 106 BTU59 °F |
~ 6.12 x 109 J |
| British thermal unit (ISO) |
BTUISO |
= 1.0545 x 103 J |
= 1.0545 x 103 J |
| British thermal unit (International Table) |
BTUIT |
|
= 1.055 055 852 62 x 103 J |
| British thermal unit (mean) |
BTUmean |
|
~ 1.055 87 x 103 J |
| British thermal unit (thermochemical) |
BTUth |
|
~ 1.054 350 x 103 J |
| British thermal unit (39 °F) |
BTU39 °F |
|
~ 1.059 67 x 103 J |
| British thermal unit (59 °F) |
BTU59 °F |
= 1.054 804 x 103 J |
= 1.054 804 x 103 J |
| British thermal unit (60 °F) |
BTU60 °F |
|
~ 1.054 68 x 103 J |
| British thermal unit (63 °F) |
BTU63 °F |
|
~ 1.0546 x 103 J |
| calorie (International Table) |
calIT |
= 4.1868 J |
= 4.1868 J |
| calorie (mean) |
calmean |
|
~ 4.190 02 J |
| calorie (thermochemical) |
calth |
= 4.184 J |
= 4.184 J |
| calorie (3.98 °C) |
cal3.98 °C |
|
~ 4.2045 J |
| calorie (15 °C) |
cal15 °C |
= 4.1855 J |
= 4.1855 J |
| calorie (20 °C) |
cal20 °C |
|
~ 4.1819 J |
| Celsius heat unit (International Table) |
CHUIT |
= 1 BTUIT x 1 K/°R |
= 1.899 100 534 716 x 103 J |
| cubic centimetre of atmosphere; standard cubic centimetre |
cc atm; scc |
= 1 atm x 1 cm3 |
= 0.101 325 J |
| cubic foot of atmosphere; standard cubic foot |
cu ft atm; scf |
= 1 atm x 1 ft3 |
= 2.869 204 480 9344 x 103 J |
| cubic foot of natural gas |
|
= 1 000 BTUIT |
= 1.055 055 852 62 x 106 J |
| cubic yard of atmosphere; standard cubic yard |
cu yd atm; scy |
= 1 atm x 1 yd3 |
= 77.468 520 985 2288 x 103 J |
| electronvolt |
eV |
= e x 1 V |
~ 1.602 177 33 x 10-19 ± 4.9 x 10-26 J |
| erg (cgs unit) |
erg |
= 1 g·cm2/s2 |
= 10-7 J |
| foot-pound force |
ft lbf |
= g x 1 lb x 1 ft |
= 1.355 817 948 331 4004 J |
| foot-poundal |
ft pdl |
= 1 lb·ft2/s2 |
= 4.214 011 009 380 48 x 10-2 J |
| gallon-atmosphere (imperial) |
imp gal atm |
= 1 atm x 1 gal (imp) |
= 460.632 569 25 J |
| gallon-atmosphere (US) |
US gal atm |
= 1 atm x 1 gal (US) |
= 383.556 849 0138 J |
| hartree, atomic unit of energy |
Eh |
= me·a2·c2 (= 2 Ry) |
~ 4.359 744 x 10-18 J |
| horsepower-hour |
hp·h |
= 1 hp x 1 h |
= 2.684 519 537 696 172 792 x 106 J |
| inch-pound force |
in lbf |
= g x 1 lb x 1 in |
= 0.112 984 829 027 6167 J |
| joule (SI unit) |
J |
The work done when a force of one newton moves the point of its application a distance of one metre in the direction of the force. |
= 1 J = 1 m·N = 1 kg·m2/s2 |
| kilocalorie; large calorie |
kcal; Cal |
= 1 000 calIT |
= 4.1868 x 103 J |
| kilowatt-hour; Board of Trade Unit |
kW·h; B.O.T.U. |
= 1 kW x 1 h |
= 3.6 x 106 J |
| litre-atmosphere |
l atm; sl |
= 1 atm x 1 L |
= 101.325 J |
| quad |
|
= 1015 BTUIT |
= 1.055 055 852 62 x 1018 J |
| rydberg |
Ry |
= R8·h·c |
~ 2.179 872 x 10-18 J |
| therm (E.C.) |
|
= 100 000 BTUIT |
= 105.505 585 262 x 106 J |
| therm (U.S.) |
|
= 100 000 BTU59 °F |
= 105.4804 x 106 J |
| thermie |
th |
= 1 McalIT |
= 4.1868 x 106 J |
| ton of coal equivalent |
TCE |
= 7 Gcalth |
= 29.3076 x 109 J |
| ton of oil equivalent |
TOE |
= 10 Gcalth |
= 41.868 x 109 J |
| ton of TNT |
tTNT |
= 1 Gcalth |
= 4.184 x 109 J |
