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Definition: The SI unit of energy E = work W is the joule. 1 J = 1 Nm = 1 Ws. E = W = P × t.
Energy can not be produced, but only transformed.Conversions of other energy units
Energy conversion chart
| Unit Name | Symbol | SI Equivalent J |
| atomic unit of energy | E h | 4.35975×10-18 J |
| barrel oil equivalent | bboe | 6.12×10+9 J |
| boe (barrel oil equivalent) | bboe | 6.12×10+9 J |
| BeV (billion eV) | BeV | 1.60218×10-10 J |
| British thermal unit (ISO) | Btu (ISO) | 1055.06 J |
| British thermal unit (IT) | Btu (IT) | 1055.055 J |
| British thermal unit (mean) | Btu (mean) | 1055.87 J |
| British thermal unit (thermochemical) | Btu (therm.) | 1054.350 J |
| calorie (4 °C) | cal 4 | 4.2045 J |
| calorie (16 °C) | cal 16 | 4.185 J |
| calorie (diet kilocalorie) | Cal, kcal | 4180 J |
| calorie (IT) (International Steam Table) | cal (IT) | 4.18674 J |
| calorie (mean) | cal mean | 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 | c3-atm | 0.101325 J |
| cubic foot atm | ft3-atm | 2869.2 J |
| electronvolt | eV | 1.602177×10-19 J |
| erg | erg | 1×10-7 J |
| foot-pound force | ft-lbf | 1.35582 J |
| foot-poundal | ft-pdl | 4.21401×10-2 J |
| gigaelectronvolt | GeV | 1.60218×10-10 J |
| gram calorie | gram-cal | 4.18674 J |
| hartree | E h | 4.35975×10-18 J |
| horsepower (550 ft-lbf/s)-hour | Hp-h | 2.68452×10+6 J |
| inch pound force | in-lbf | 0.112985 J |
| joule | J | 1 J |
| kilocalorie (4 °C) | kcal 4 | 4204.5 J |
| kilocalorie (16 °C) | kcal 16 | 4185.5 J |
| kiloelectronvolt | keV | 1.60218×10-16 J |
| kilojoule | kJ | 1000 J |
| kiloton TNT equivalent | kt (TNT) | 4.18×12 J |
| kilowatt-hour | kWh | 3.6×6 J |
| megaelectronvolt | MeV | 1.60218×10-13 J |
| megajoule | MJ | 1×6 J |
| megaton TNT equivalent | Mt (TNT) | 4.18×1015 J |
| newton meter | Nm | 1 J |
| Q unit | 1.05506×1021 J | |
| quadrillion, quad | quad | 1.055056×1018 J |
| rydberg | Ry | 2.17987×10-18 J |
| tce (tonne coal equivalent) | tce | 2.929×1010 J |
| therm (EC) | 1.05506×108 J | |
| therm (US) | 1.054804×108 J | |
| thermie (16 °C) | th 16° | 4.1855×106 J |
| toe (tonne oil equivalent) | toe | 4.187×1010 J |
| ton TNT equivalent | ton (TNT) | 4.18×109 J |
| tonne coal equivalent | tce | 2.929×1010 J |
| tonne oil equivalent | toe | 4.187×1010 J |
| watt hour | Wh | 3600 J |
| watt second | Ws | 1 J |
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