Power and Energy
WhtokJ
Convert watt-hours (Wh) to kilojoules (kJ).
Factor1 Wh = 3.6 kJ
Converter
Wh
Accepts numbers or expressions, e.g. 150 + 14.7
Result
kJ
Rendered to 6 significant figures.
Formula
Formula
kJ = Wh × 3.6
Multiply any value in watt-hours by 3.6 to obtain the value in kilojoules.
Worked example
Convert 1 Wh to kJ.
- 01Start with 1 Wh.
- 02Multiply by the conversion factor: 1 × 3.6 = 3.6 kJ.
Result1 Wh = 3.6 kJ
Conversion table
| Wh | kJ |
|---|---|
| 1 | 3.6 |
| 2 | 7.2 |
| 5 | 18 |
| 10 | 36 |
| 20 | 72 |
| 50 | 180 |
| 100 | 360 |
| 200 | 720 |
| 500 | 1800 |
| 1000 | 3600 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from Wh to kJ?
1 Wh equals 3.6 kJ. To convert, multiply the value in watt-hours by 3.6.
How do I convert 1 Wh to kJ?
1 Wh = 3.6 kJ. For any value, multiply by 3.6.
How do I convert kJ back to Wh?
Divide by the same factor — or equivalently, multiply by 0.2777778. So 1 kJ = 0.277778 Wh.
When would I need to convert watt-hour to kilojoule?
Energy conversions are needed when reconciling fuel/electrical billing, calculating thermal duties, and aligning calorimetry or HHV/LHV figures across data sources.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).