Energy Converter
Convert between joules, calories, kilowatt-hours, BTU, foot-pounds, electronvolts and tons of TNT.
The 'calorie' on food labels is really a kilocalorie. The thermochemical calorie (4.184 J) is used here unless marked IT.
Popular energy conversions
- Kilocalories to kilojoules
- Kilojoules to kilocalories
- Kilowatt-hours to megajoules
- British thermal units to joules
- British thermal units to kilowatt-hours
- Kilowatt-hours to British thermal units
- Calories to joules
- Joules to calories
- Watt-hours to joules
- Foot-pounds to joules
- Kilowatt-hours to kilocalories
Common units
| Unit | Symbol | Value in joules |
|---|---|---|
| joule | J | 1 J |
| kilojoule | kJ | 1,000 J |
| megajoule | MJ | 1,000,000 J |
| gigajoule | GJ | 1,000,000,000 J |
| watt-hour | Wh | 3,600 J |
| kilowatt-hour | kWh | 3,600,000 J |
| megawatt-hour | MWh | 3,600,000,000 J |
| British thermal unit | BTU | 1,055.055853 J |
| foot-pound | ft⋅lbf | 1.355817948 J |
Other units
| Unit | Symbol | Value in joules |
|---|---|---|
| millijoule | mJ | 0.001 J |
| electronvolt | eV | 1.602176634×10⁻¹⁹ J |
| kiloelectronvolt | keV | 1.602176634×10⁻¹⁶ J |
| megaelectronvolt | MeV | 1.602176634×10⁻¹³ J |
| gigaelectronvolt | GeV | 1.602176634×10⁻¹⁰ J |
| ton of TNT | tTNT | 4,184,000,000 J |
| tonne of oil equivalent | toe | 41,868,000,000 J |
Historical and traditional units
| Unit | Symbol | Value in joules |
|---|---|---|
| calorie | cal | 4.184 J |
| kilocalorie | kcal | 4,184 J |
| therm | thm | 105,480,400 J |
| quad | quad | 1.055055853×10¹⁸ J |
| erg | erg | 1×10⁻⁷ J |
| calorie (IT) | cal (IT) | 4.1868 J |
| kilogram-force meter | kgf⋅m | 9.80665 J |
| horsepower-hour | hp⋅h | 2,684,519.538 J |
| liter-atmosphere | L⋅atm | 101.325 J |