11 UNITS
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Convert joules, kilojoules, calories, kilocalories, watt-hours, kilowatt-hours, BTU and more. The food Calorie is the kilocalorie, 4,184 joules.
Energy units and their values
| Unit | Symbol | Value |
|---|---|---|
| electronvolts | eV | 1 eV = 1.602176634 × 10^-19 J |
| joules | J | Base unit |
| kilojoules | kJ | 1 kJ = 1,000 J |
| megajoules | MJ | 1 MJ = 1,000,000 J |
| calories | cal | 1 cal = 4.184 J |
| kilocalories | kcal | 1 kcal = 4,184 J |
| watt hours | Wh | 1 Wh = 3,600 J |
| kilowatt hours | kWh | 1 kWh = 3,600,000 J |
| megawatt hours | MWh | 1 MWh = 3,600,000,000 J |
| British thermal units | BTU | 1 BTU = 1,055.055853 J |
| foot-pounds | ft·lbf | 1 ft·lbf = 1.355817948 J |
Factors come from each unit’s definition and are applied without rounding; the converter shows 7 significant figures.