1 watt-hour (Wh) = 3.6 kilojoules (kJ). To convert, multiply by 3.6: kJ = Wh × 3.6. For example, 5 Wh = 18 kJ.
kJ = Wh × 3.6
Watt-hours to kilojoules table
| 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 |
The two units
Watt-hour (Wh). One watt for one hour: 3,600 joules. Battery capacities are given in Wh.
Kilojoule (kJ). One thousand joules; food labels outside the US often give energy in kJ.
Because both units are defined in terms of the same base unit, the factor 3.6 is exact, not a rounded measurement.
Convert watt-hours to other units
- Watt-hours to joules — 1 Wh = 3,600 J
- Watt-hours to calories — 1 Wh = 860.4206501 cal
- Watt-hours to kilocalories — 1 Wh = 0.8604206501 kcal
- Watt-hours to kilowatt-hours — 1 Wh = 0.001 kWh
- Watt-hours to British thermal units — 1 Wh = 3.412141633 BTU
- Watt-hours to electronvolts — 1 Wh = 2.246943e+22 eV
Convert other units to kilojoules
Questions people ask
- How many kilojoules are in a watt-hour?
- 3.6, exactly.
- How do you convert watt-hours to kilojoules?
- kJ = Wh × 3.6. It is the same as dividing by 0.2777777778.
- How do you convert kilojoules back to watt-hours?
- Wh = kJ ÷ 3.6. See kilojoules to watt-hours.
Results use the legal definitions of each unit and are checked against the Pint unit library. Display rounds to 10 significant digits. All unit conversions · More tools
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