Power and Energy
WhtoJ
Convert watt-hours (Wh) to joules (J).
Factor1 Wh = 3600 J
Converter
Wh
Accepts numbers or expressions, e.g. 150 + 14.7
Result
J
Rendered to 6 significant figures.
Formula
Formula
J = Wh × 3600
Multiply any value in watt-hours by 3600 to obtain the value in joules.
Worked example
Convert 1 Wh to J.
- 01Start with 1 Wh.
- 02Multiply by the conversion factor: 1 × 3600 = 3600 J.
Result1 Wh = 3600 J
Conversion table
| Wh | J |
|---|---|
| 1 | 3600 |
| 2 | 7200 |
| 5 | 18000 |
| 10 | 36000 |
| 20 | 72000 |
| 50 | 1.8000e+5 |
| 100 | 3.6000e+5 |
| 200 | 7.2000e+5 |
| 500 | 1.8000e+6 |
| 1000 | 3.6000e+6 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from Wh to J?
1 Wh equals 3600 J. To convert, multiply the value in watt-hours by 3600.
How do I convert 1 Wh to J?
1 Wh = 3600 J. For any value, multiply by 3600.
How do I convert J back to Wh?
Divide by the same factor — or equivalently, multiply by 0.0002777778. So 1 J = 0.000277778 Wh.
When would I need to convert watt-hour to joule?
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).