Convert joules, kilowatt-hours, calories, BTU and other units of energy.
Units of energy
The base unit of energy is the joule (J). Electricity bills use kilowatt-hours (kWh): 1 kWh = 3.6 MJ = 3,600,000 J. Food energy is given in kilocalories (kcal), where 1 kcal = 4,184 J. The BTU is an imperial unit used in heating and cooling: 1 BTU is about 1,055 J.
Conversion factors
1 kWh = 860.421 kcal
1 kcal = 0.00116222 kWh
One unit converted to all others: Kilowatt-hour (kWh)
| Unit | Value |
|---|
| Joule (J) | 3,600,000 |
| Kilojoule (kJ) | 3,600 |
| Watt-hour (Wh) | 1,000 |
| Kilowatt-hour (kWh) | 1 |
| Kilocalorie (kcal) | 860.421 |
| British thermal unit (BTU) | 3,412.14 |
| Megajoule (MJ) | 3.6 |
| Gigajoule (GJ) | 0.0036 |
| Calorie (cal) | 860,421 |
| Electronvolt (eV) | 22,469,400,000,000,000,000,000,000 |
| Foot-pound (ft·lbf) | 2,655,220 |
Common values
| Kilowatt-hour (kWh) | Kilocalorie (kcal) |
|---|
| 1 kWh | 860.421 kcal |
| 5 kWh | 4,302.1 kcal |
| 10 kWh | 8,604.21 kcal |
| 50 kWh | 43,021 kcal |
| 100 kWh | 86,042.1 kcal |
| Kilocalorie (kcal) | Kilowatt-hour (kWh) |
|---|
| 1 kcal | 0.00116222 kWh |
| 5 kcal | 0.00581111 kWh |
| 10 kcal | 0.0116222 kWh |
| 50 kcal | 0.0581111 kWh |
| 100 kcal | 0.116222 kWh |
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