





Symbol: | J |
Category: | Energy |
SI Equivalent: | 1 J |
Dimension: | ML2T-2 |
System: | SI |
Notes | |
Named after the English physicist James Prescott Joule (1818-1889), the joule is the basic unit of work or energy in the SI system. It is equal to the work done by a force of 1 newton with the point of application displaced by 1 meter in the direction of the force. |









Energy | ||
Symbol | Unit Name | |
3.10458×10-9 | bboe | barrel oil equivalent |
1.80085×10-2 | Btu (IT) | British thermal unit (IT) |
1.79946×10-2 | Btu (mean) | British thermal unit (mean) |
1.80206×10-2 | Btu (therm.) | British thermal unit (thermochemical) |
4.54545×10-3 | Cal, kcal | Calorie (diet kilocalorie) |
4.53458 | calmean | calorie (mean) |
4.54111 | cal (therm.) | calorie (thermochemical) |
1.18589×1020 | eV | electronvolt |
1.9×108 | erg | erg |
14.0137 | ft-lbf | foot-pound force |
450.877 | ft-pdl | foot-poundal |
7.07762×10-6 | Hp-h | horsepower (550ft-lbf/s)-hour |
4.53948×10-3 | kcal15 | kilocalorie (15°C) |
4.51897×10-3 | kcal4 | kilocalorie (4°C) |
1.9×10-2 | kJ | kilojoule |
4.54545×10-12 | kt (TNT) | kiloton TNT equivalent |
5.27778×10-6 | kWh | kilowatt-hour |
1.18589×1014 | MeV | megaelectronvolt |
1.9×10-5 | MJ | megajoule |
4.54545×10-15 | Mt (TNT) | megaton TNT equivalent |
6.48686×10-10 | tce | tce (tonne coal equivalent) |
1.80128×10-7 | therm (US) | |
4.54545×10-9 | ton (TNT) | ton TNT equivalent |
5.27778×10-3 | Wh | watt hour |

