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Science
Energy Conversion Table
Values shown for 1 Joule
About Energy Conversions
One quantity, energy, shows up under a different unit in every field. The joule is the SI base; from there it ties to the food calorie in nutrition (1 Calorie = 4,184 joules), the kilowatt-hour on your power bill, the British thermal unit in HVAC, and the electron volt in particle physics. Numbers make the scale concrete: a 2,000-calorie day is about 8.4 megajoules, and a household burning 900 kWh a month runs through roughly 3.24 gigajoules. Every unit below converts on exact factors.
| Unit Name | Symbol | Value | Formula |
|---|---|---|---|
| British Thermal Unit | BTU | 0.000947817 | multiply by 1,055.05585 |
| Calorie | cal | 0.239006 | multiply by 4.184 |
| Electron Volt | eV | 6.24151 × 10¹⁸ | multiply by 1.602176634 × 10⁻¹⁹ |
| Joule | J | 1 | base unit |
| Kilocalorie | kcal | 0.000239006 | multiply by 4,184 |
| Kilojoule | kJ | 0.001 | multiply by 1,000 |
| Kilowatt-hour | kWh | 2.77778 × 10⁻⁷ | multiply by 3,600,000 |
| Megajoule | MJ | 0.000001 | multiply by 1,000,000 |
| Watt-hour | Wh | 0.000277778 | multiply by 3,600 |