Energy unit converter
Joules, calories, kWh and BTU — with the ambiguous ones split out by definition.
Precision & format
1 J equals
0.001kJ
All 21 units
- JouleJ1
- KilojoulekJ0.001
- MegajouleMJ0.000001
- GigajouleGJ1 × 10⁻⁹
- MillijoulemJ1,000
- Calorie (thermochemical)calexactly 4.184 J0.2390057361
- Kilocalorie (thermochemical)kcalfood Calorie0.0002390057361
- Calorie (IT)cal (IT)International Table0.2388458966
- Kilocalorie (IT)kcal (IT)0.0002388458966
- Watt-hourWh0.0002777777778
- Kilowatt-hourkWh2.777777778 × 10⁻⁷
- Megawatt-hourMWh2.777777778 × 10⁻¹⁰
- BTU (IT)BTUInternational Table0.0009478171203
- BTU (thermochemical)BTU (th)0.0009484514148
- Therm (US)thm100 000 BTU9.48043428 × 10⁻⁹
- Foot-poundft·lbf0.7375621493
- Ergerg10,000,000
- ElectronvolteV6.241509074 × 10¹⁸
- KiloelectronvoltkeV6.241509074 × 10¹⁵
- MegaelectronvoltMeV6,241,509,074,000
- Tonne of oil equivalenttoe2.388458966 × 10⁻¹¹
Energy conversion table
Every unit expressed in joules (J), the SI base for this category.
| Unit | Symbol | 1 unit in J |
|---|---|---|
| Joule | J | 1 |
| Kilojoule | kJ | 1,000 |
| Megajoule | MJ | 1,000,000 |
| Gigajoule | GJ | 1,000,000,000 |
| Millijoule | mJ | 0.001 |
| Calorie (thermochemical)exactly 4.184 J | cal | 4.184 |
| Kilocalorie (thermochemical)food Calorie | kcal | 4,184 |
| Calorie (IT)International Table | cal (IT) | 4.1868 |
| Kilocalorie (IT) | kcal (IT) | 4,186.8 |
| Watt-hour | Wh | 3,600 |
| Kilowatt-hour | kWh | 3,600,000 |
| Megawatt-hour | MWh | 3,600,000,000 |
| BTU (IT)International Table | BTU | 1,055.0559 |
| BTU (thermochemical) | BTU (th) | 1,054.3503 |
| Therm (US)100 000 BTU | thm | 105,480,400 |
| Foot-pound | ft·lbf | 1.3558179 |
| Erg | erg | 1 × 10⁻⁷ |
| Electronvolt | eV | 1.6021766 × 10⁻¹⁹ |
| Kiloelectronvolt | keV | 1.6021766 × 10⁻¹⁶ |
| Megaelectronvolt | MeV | 1.6021766 × 10⁻¹³ |
| Tonne of oil equivalent | toe | 41,868,000,000 |
