Power and Energy
GJtoWh
Convert gigajoules (GJ) to watt-hours (Wh).
Factor1 GJ = 277777.8 Wh
Converter
GJ
Accepts numbers or expressions, e.g. 150 + 14.7
Result
Wh
Rendered to 6 significant figures.
Formula
Formula
Wh = GJ × 277777.8
Multiply any value in gigajoules by 277777.8 to obtain the value in watt-hours.
Worked example
Convert 1 GJ to Wh.
- 01Start with 1 GJ.
- 02Multiply by the conversion factor: 1 × 277777.8 = 277778 Wh.
Result1 GJ = 277778 Wh
Conversion table
| GJ | Wh |
|---|---|
| 1 | 2.7778e+5 |
| 2 | 5.5556e+5 |
| 5 | 1.3889e+6 |
| 10 | 2.7778e+6 |
| 20 | 5.5556e+6 |
| 50 | 1.3889e+7 |
| 100 | 2.7778e+7 |
| 200 | 5.5556e+7 |
| 500 | 1.3889e+8 |
| 1000 | 2.7778e+8 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from GJ to Wh?
1 GJ equals 277777.8 Wh. To convert, multiply the value in gigajoules by 277777.8.
How do I convert 1 GJ to Wh?
1 GJ = 277778 Wh. For any value, multiply by 277777.8.
How do I convert Wh back to GJ?
Divide by the same factor — or equivalently, multiply by 3.6e-6. So 1 Wh = 3.6e-6 GJ.
When would I need to convert gigajoule to watt-hour?
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).