Enter an energy value and select its unit. The tool will convert it to all supported units: Joules (J), Kilojoules (kJ), Calories (cal), Kilocalories (kcal), Kilowatt-hours (kWh), Electronvolts (eV), and BTU.
All calculations happen locally in your browser.
| Unit | Symbol | Conversion (1 J = ?) | Common Uses |
|---|---|---|---|
| Joule | J | 1 J | SI unit |
| Kilojoule | kJ | 0.001 kJ | Food energy labels |
| Calorie | cal | 0.239 cal | Chemistry, physics |
| Kilocalorie | kcal | 0.000239 kcal | Nutrition |
| Kilowatt-hour | kWh | 2.778×10⁻⁷ kWh | Electricity billing |
| Electronvolt | eV | 6.242×10¹⁸ eV | Atomic physics |
| BTU | BTU | 0.0009478 BTU | HVAC, AC cooling |