Energy
system unit code
(alternative) 		symbol or
abbrev. 		notes sample
default conversion 		combinations
SI yottajoule YJ YJ 1.0 YJ (2.8×1017 kWh)
zettajoule ZJ ZJ 1.0 ZJ (2.8×1014 kWh)
exajoule EJ EJ 1.0 EJ (2.8×1011 kWh)
petajoule PJ PJ 1.0 PJ (280,000,000 kWh)
terajoule TJ TJ 1.0 TJ (280,000 kWh)
gigajoule GJ GJ 1.0 GJ (280 kWh)
megajoule MJ MJ 1.0 MJ (0.28 kWh)
kilojoule kJ kJ 1.0 kJ (240 cal)
hectojoule hJ hJ 1.0 hJ (24 cal)
decajoule daJ daJ 1.0 daJ (2.4 cal)
joule J J 1.0 J (0.24 cal)
decijoule dJ dJ 1.0 dJ (0.024 cal)
centijoule cJ cJ 1.0 cJ (0.0024 cal)
millijoule mJ mJ 1.0 mJ (0.00024 cal)
microjoule μJ (uJ) μJ 1.0 μJ (2.4×10−7 cal)
nanojoule nJ nJ 1.0 nJ (2.4×10−10 cal)
picojoule pJ pJ 1.0 pJ (6.2 MeV)
femtojoule fJ fJ 1.0 fJ (6.2 keV)
attojoule aJ aJ 1.0 aJ (6.2 eV)
zeptojoule zJ zJ 1.0 zJ (6.2 meV)
yoctojoule yJ yJ 1.0 yJ (6.2 μeV)
cgs megaerg Merg Merg 1.0 Merg (0.10 J)
kiloerg kerg kerg 1.0 kerg (0.10 mJ)
erg erg (none) 1.0 erg (0.10 μJ)
millierg merg merg 1.0 merg (0.00010 μJ)
microerg μerg μerg 1.0 μerg (0.00010 nJ)
microerg uerg μerg 1.0 μerg (0.00010 nJ)
Watt-hour multiples terawatt-hour TWh TWh 1.0 TWh (3.6 PJ)
TW.h
(TW·h, TW-h) 		TW⋅h
gigawatt-hour GWh GWh 1.0 GWh (3.6 TJ)
GW.h
(GW·h, GW-h) 		GW⋅h
megawatt-hour MWh MWh 1.0 MWh (3.6 GJ)
MW.h
(MW·h, MW-h) 		MW⋅h
kilowatt-hour kWh kWh 1.0 kWh (3.6 MJ)
kW.h
(kW·h, kW-h) 		kW⋅h
watt-hour Wh Wh 1.0 Wh (3.6 kJ)
W.h
(W·h, W-h) 		W⋅h
milliwatt-hour mWh mWh 1.0 mWh (3.6 J)
mW.h
(mW·h, mW-h) 		mW⋅h
microwatt-hour μWh (uWh) μWh 1.0 μWh (3.6 mJ)
μW.h
(uW·h, μW.h, uW.h, μW-h, uW-h) 		μW⋅h
Electronvolt multiples petaelectronvolt PeV PeV 1.0 PeV (0.16 mJ)
teraelectronvolt TeV TeV 1.0 TeV (0.16 μJ)
gigaelectronvolt GeV GeV 1.0 GeV (0.16 nJ)
megaelectronvolt MeV MeV 1.0 MeV (0.16 pJ)
kiloelectronvolt keV keV 1.0 keV (0.16 fJ)
electronvolt eV eV 1.0 eV (0.16 aJ)
millielectronvolt meV meV 1.0 meV (0.16 zJ)
microelectronvolt μeV (ueV) μeV 1.0 μeV (0.16 yJ)
nanoelectronvolt neV neV 1.0 neV (0.00016 yJ)
picoelectronvolt peV peV 1.0 peV (1.6×10−7 yJ)
femtoelectronvolt feV feV 1.0 feV (1.6×10−10 yJ)
Calorie multiples calorie Cal (Calorie) Cal 1.0 Cal (4.2 kJ)
megacalorie Mcal Mcal 1.0 Mcal (4.2 MJ)
kilocalorie kcal kcal 1.0 kcal (4.2 kJ)
calorie cal cal 1.0 cal (4.2 J)
millicalorie mcal mcal 1.0 mcal (4.2 mJ)
Calorie (thermochemical) Cal-th (kg-cal-th) Calth 1.0 Calth (4.2 kJ)
megacalorie (thermochemical) Mcal-th (g-cal-th) Mcalth 1.0 Mcalth (4.2 MJ)
kilocalorie (thermochemical) kcal-th (g-cal-th) kcalth 1.0 kcalth (4.2 kJ)
calorie (thermochemical) cal-th (g-cal-th) calth 1.0 calth (4.2 J)
millicalorie (thermochemical) mcal-th (g-cal-th) mcalth 1.0 mcalth (4.2 mJ)
Calorie (15°C) Cal-15 (kg-cal-15) Cal15 1.0 Cal15 (4.2 kJ)
megacalorie (15°C) Mcal-15 (g-cal-15) Mcal15 1.0 Mcal15 (4.2 MJ)
kilocalorie (15°C) kcal-15 (g-cal-15) kcal15 1.0 kcal15 (4.2 kJ)
calorie (15°C) cal-15 (g-cal-15) cal15 1.0 cal15 (4.2 J)
millicalorie (15°C) mcal-15 (g-cal-15) mcal15 1.0 mcal15 (4.2 mJ)
Calorie (International Steam Table) Cal-IT (kg-cal-IT) CalIT 1.0 CalIT (4.2 kJ)
megacalorie (International Steam Table) Mcal-IT (g-cal-IT) McalIT 1.0 McalIT (4.2 MJ)
kilocalorie (International Steam Table) kcal-IT (g-cal-IT) kcalIT 1.0 kcalIT (4.2 kJ)
calorie (International Steam Table) cal-IT (g-cal-IT) calIT 1.0 calIT (4.2 J)
millicalorie (International Steam Table) mcal-IT (g-cal-IT) mcalIT 1.0 mcalIT (4.2 mJ)
pound/ounce-foot/
inch-hour-minute-second 		foot-poundal ftpdl ft⋅pdl 1.0 ft⋅pdl (0.042 J)
foot-pound force ftlbf ft⋅lbf 1.0 ft⋅lbf (1.4 J)
ftlb-f ft⋅lbf
foot-pound ftlb ft⋅lb
inch-pound force inlbf in⋅lbf 1.0 in⋅lbf (110 mJ)
inlb-f in⋅lbf
inch-pound inlb in⋅lb
inch-ounce force inozf in⋅ozf 1.0 in⋅ozf (7.1 mJ)
inoz-f in⋅ozf
horsepower-hour hph hp⋅h 1.0 hp⋅h (0.75 kWh)
British thermal unit multiples British thermal unit Btu Btu 1.0 Btu (1.1 kJ)
BTU BTU
million British thermal units MMBtu MMBtu 1.0 MMBtu (1.1 GJ)
e6BTU BTU
British thermal unit (IT) Btu-IT BtuIT 1.0 BtuIT (1.1 kJ)
BTU-IT BTUIT
British thermal unit (thermochemical) Btu-th Btuth 1.0 Btuth (1.1 kJ)
BTU-th BTUth
British thermal unit (ISO) Btu-ISO BTUISO 1.0 BTUISO (1.1 kJ)
BTU-ISO BTUISO
British thermal unit (39°F) Btu-39F Btu39°F 1.0 Btu39°F (1.1 kJ)
BTU-39F BTU39°F
British thermal unit (59°F) Btu-59F Btu59°F 1.0 Btu59°F (1.1 kJ)
BTU-59F BTU59°F
British thermal unit (60°F) Btu-60F Btu60°F 1.0 Btu60°F (1.1 kJ)
BTU-60F BTU60°F
British thermal unit (63°F) Btu-63F Btu63°F 1.0 Btu63°F (1.1 kJ)
BTU-63F BTU63°F
British thermal unit (mean) Btu-mean Btumean 1.0 Btumean (1.1 kJ)
BTU-mean BTUmean
quadrillion British thermal units quad quad assumes the 59 °F Btu and the "long scale" quadrillion (1015) 1.0 quad (1.1 EJ)
therm (EC) thm-EC thm (EC) 1.0 thm (EC) (110 MJ)
therm (UK) thm-UK thm (UK) 1.0 thm (UK) (110 MJ)
therm (US) thm-US thm (US) 1.0 thm (US) (110 MJ)
TNT-based units teratonne of TNT TtTNT (none) 1.0 teratonne of TNT (4.2 ZJ)
teraton of TNT TtonTNT (none)
gigatonne of TNT GtTNT (none) 1.0 gigatonne of TNT (4.2 EJ)
gigaton of TNT GtonTNT (none)
megatonne of TNT MtTNT (none) 1.0 megatonne of TNT (4.2 PJ)
megaton of TNT MtonTNT Mt
kilotonne of TNT ktTNT (none) 1.0 kilotonne of TNT (4.2 TJ)
kiloton of TNT ktonTNT kt
tonne of TNT tTNT (none) 1.0 tonne of TNT (4.2 GJ)
ton of TNT tonTNT (none)
kilogram of TNT kgTNT (none) 1.0 kilogram of TNT (4.2 MJ)
millitonne of TNT mtTNT (none)
milliton of TNT mtonTNT (none)
gram of TNT gTNT (none) 1.0 gram of TNT (4.2 kJ)
oil-based units gigatonne of oil equivalent Gtoe Gtoe 1.0 Gtoe (42 EJ)
megatonne of oil equivalent Mtoe Mtoe 1.0 Mtoe (42 PJ)
kilotonne of oil equivalent ktoe ktoe 1.0 ktoe (42 TJ)
tonne of oil equivalent toe toe 1.0 toe (42 GJ)
kilo barrel of oil equivalent kBOE (kbboe) kBOE 1.0 kBOE (6.1 TJ)
barrel of oil equivalent BOE BOE 1.0 BOE (6.1 GJ)
atmospheric-pressure-based units m3atm[convert: unknown unit] m3atm (none) 1.0 m3atm[convert: unknown unit]
scc[convert: unknown unit] scc (none) 1.0 scc[convert: unknown unit]
cm3atm[convert: unknown unit] cm3atm (none)
ccatm ccatm[convert: unknown unit]
Glatm[convert: unknown unit] Glatm (none) 1.0 Glatm[convert: unknown unit]
GLatm GLatm[convert: unknown unit]
Mlatm[convert: unknown unit] Mlatm (none) 1.0 Mlatm[convert: unknown unit]
MLatm MLatm[convert: unknown unit]
klatm[convert: unknown unit] klatm (none) 1.0 klatm[convert: unknown unit]
kLatm kLatm[convert: unknown unit]
sl[convert: unknown unit] sl (none) 1.0 sl[convert: unknown unit]
latm[convert: unknown unit] latm (none)
Latm Latm[convert: unknown unit]
mlatm[convert: unknown unit] mlatm (none) 1.0 mlatm[convert: unknown unit]
mLatm mLatm[convert: unknown unit]
scy[convert: unknown unit] scy (none) 1.0 scy[convert: unknown unit]
cuydatm[convert: unknown unit] cuydatm (none)
standard cubic foot scf (scfoot) scf long code "scfoot and cufootatm" outputs standard cubic foot and cubic foot of atmosphere respectively (and never feet) 1.0 scf (2.9 kJ)
cuftatm[convert: unknown unit] cuftatm (cufootatm) (none)
impgalatm[convert: unknown unit] impgalatm (none) 1.0 impgalatm[convert: unknown unit]
USgalatm[convert: unknown unit] USgalatm (usgalatm) (none) 1.0 USgalatm[convert: unknown unit]
U.S.galatm (usgalatm) U.S.galatm[convert: unknown unit]
Other foe foe (none) 1051 ergs 1.0 foe (1.0×1020 YJ)
Board of Trade Unit B.O.T.U. B.O.T.U. an obsolete UK synonym for kilowatt-hour 1.0 B.O.T.U. (3.6 MJ)
Celsius heat unit (International Table) CHU-IT CHUIT 1 BTUIT × 1 °C/°F 1.0 CHUIT (1.9 kJ)
thermie th th 1 McalIT 1.0 th (4.2 MJ)
Hartree Eh (Hartree) Eh 1.0 Eh (27 eV)
rydberg Ry Ry 1.0 Ry (14 eV)
cubic foot of natural gas cuftnaturalgas
(cufootnaturalgas) 		(none) long code "cufootnaturalgas" outputs cubic foot of natural gas (and never feet) 1.0 cubic foot of natural gas (1.1 MJ)
Category