Kilojoules to Watt-hours Converter
1 kilojoule ≈ 0.277777778 watt-hours
1 kilojoule equals 0.277778 watt-hours
How to convert kilojoules to watt-hours
Calories here are thermochemical (4.184 J), while BTU uses the International Table definition. A kilowatt-hour is energy (3.6 MJ), not power; a food Calorie is a kilocalorie.
Wh = kJ × 0.2777777778One kilojoule is 0.2777777778 watt-hours, so a single multiplication converts any value.
2.77778 Wh ≈ 10 × 0.2777777778Kilojoules to watt-hours conversion table
Common values in kilojoules, converted to watt-hours.
| Kilojoules (kJ) | Watt-hours (Wh) |
|---|---|
| 1 | 0.27777778 |
| 2 | 0.55555556 |
| 3 | 0.83333333 |
| 4 | 1.1111111 |
| 5 | 1.3888889 |
| 10 | 2.7777778 |
| 20 | 5.5555556 |
| 25 | 6.9444444 |
| 50 | 13.888889 |
| 100 | 27.777778 |
| 250 | 69.444444 |
| 500 | 138.88889 |
| 1,000 | 277.77778 |
About these units
kilojoulekJ
One thousand joules. The metric food-energy unit outside the United States.
watt-hourWh
One watt sustained for one hour: exactly 3,600 joules.
Sources and precision
Table results are rounded to 8 significant digits; formula constants may be rounded to 10. Worked example answers use 6 significant digits. The converter starts at 6 significant digits and lets you change display precision. Calculations use the stored factors without intermediate rounding. Exact unit definitions do not make an input measurement more precise; conventional and measured factors follow the assumptions stated here.