Quick Answer
1 kilojoule equals 0.277778 watt-hours. To convert kilojoules to watt-hours, multiply the value by this factor.
Key Facts
- Reverse: 1 watt-hour = 3.6 kilojoules.
Kilojoules to Watt-hours Converter
Free instant kJ → Wh converter. No signup, no uploads — everything is calculated privately in your browser.
1 kJ = 0.277778 watt-hours
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Kilojoules to Watt-hours Formula
Formula: value ÷ 3.6
Prefer to skip the math? Type any value in the converter above and it converts instantly.
Kilojoules to Watt-hours Conversion Table
| Kilojoules (kJ) | Watt-hours (Wh) |
|---|---|
| 1 kJ | 0.277778 Wh |
| 2 kJ | 0.555556 Wh |
| 5 kJ | 1.38889 Wh |
| 10 kJ | 2.77778 Wh |
| 25 kJ | 6.94444 Wh |
| 50 kJ | 13.8889 Wh |
| 100 kJ | 27.7778 Wh |
| 250 kJ | 69.4444 Wh |
| 500 kJ | 138.889 Wh |
| 1,000 kJ | 277.778 Wh |
Frequently Asked Questions
How do I convert kilojoules to watt-hours?
Enter the value above and the result appears instantly — the calculation runs entirely in your browser. Formula: value ÷ 3.6.
What is the exact kilojoules to watt-hours conversion factor?
1 kilojoule = 0.277778 watt-hours (shown to 6 significant figures — the converter itself computes at full precision). The reverse factor is 1 watt-hour = 3.6 kilojoules.
What are some common kilojoules to watt-hours conversions?
1 kJ = 0.277778 Wh; 10 kJ = 2.77778 Wh; 100 kJ = 27.7778 Wh. Use the full conversion table below for more reference values.
Is a calorie the same as a food Calorie?
No — and the capital letter matters. A food Calorie (with a capital C) is a kilocalorie: 1,000 small calories. This converter treats them correctly: 1 kcal = 4.184 kJ = 1,000 cal. Energy labels on food almost always mean kilocalories, even where the label just says "calories".
Related Energy Conversions
- Joules to Kilojoules
- Joules to Calories
- Joules to Kilocalories
- Joules to Watt-hours
- Joules to Kilowatt-hours
- Joules to BTU
- Kilojoules to Joules
- Kilojoules to Calories