Watt-hours to Kilojoules Converter
1 watt-hour = 3.6 kilojoules
1 watt-hour equals 3.6 kilojoules
How to convert watt-hours to kilojoules
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.
kJ = Wh × 18/5One watt-hour is 18/5 kilojoules, so a single multiplication converts any value.
36 kJ = 10 × 18/5Watt-hours to kilojoules conversion table
Common values in watt-hours, converted to kilojoules.
| Watt-hours (Wh) | Kilojoules (kJ) |
|---|---|
| 1 | 3.6 |
| 2 | 7.2 |
| 3 | 10.8 |
| 4 | 14.4 |
| 5 | 18 |
| 10 | 36 |
| 20 | 72 |
| 25 | 90 |
| 50 | 180 |
| 100 | 360 |
| 250 | 900 |
| 500 | 1,800 |
| 1,000 | 3,600 |
About these units
watt-hourWh
One watt sustained for one hour: exactly 3,600 joules.
kilojoulekJ
One thousand joules. The metric food-energy unit outside the United States.
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.