Convert kilojoules to watt-hours quickly and accurately using this free online converter
Used in nutrition labels, physics, and electricity consumption.
💡 Calories (kcal) are used in food; joules in science; kWh in electricity.
Wh = kJ × 0.277778
Example: 1 kJ × 0.277778 = 0.277778 Wh
Use kcal for food; kWh for energy consumption; joules for science.
Common uses: nutrition, electricity bills, and scientific calculations.
How do I convert kJ to Wh?
Multiply the value in Kilojoules by 0.277778. For example: 10 kJ = 2.7778 Wh.
When should I use Watt-hours instead of Kilojoules?
Use kcal for food; kWh for energy consumption; joules for science.
Is this converter accurate?
Yes. We use internationally recognized conversion factors, updated to current standards.
| Kilojoules (kJ) | Watt-hours (Wh) |
|---|---|
| 1 kJ | 0.277778 Wh |
| 10 kJ | 2.7778 Wh |
| 50 kJ | 13.8889 Wh |
| 100 kJ | 27.7778 Wh |
| 250 kJ | 69.4444 Wh |
| 500 kJ | 138.8889 Wh |
| 1000 kJ | 277.7778 Wh |
| 2000 kJ | 555.5556 Wh |