To convert gigajoules to megawatt hours, multiply by 0.2777777778.
The calculation uses 1 GJ = 0.2777777778 MWh. Results are displayed to at most 10 significant digits. Definitions can be exact while a displayed decimal is rounded. Match the displayed precision to your original measurement.
The formula
value in MWh = value in GJ × 0.2777777778
GJ- Input unit: gigajoules
MWh- Output unit: megawatt hours
How to use this calculator
- Enter a value in GJ.
- Multiply by the stored conversion factor.
- Read the result in MWh; divide by the same factor to convert back.
Worked examples
Worked conversion
1 GJ × 0.2777777778 ≈ 0.2777777778 MWh.
Reverse conversion
0.2777777778 MWh ÷ 0.2777777778 ≈ 1 GJ. Rounding intermediate values can change the last displayed digit.
Frequently asked questions
What factor does this converter use?
It uses 0.2777777778 MWh per GJ.
Why can another converter show a slightly different answer?
Check the unit convention first (such as US versus Imperial or decimal versus binary), then compare rounding. Measurement uncertainty is separate from the unit conversion.
GJ to MWh table
| GJ | MWh (rounded) |
|---|---|
| 0 | 0 |
| 1 | 0.2777777778 |
| 2 | 0.5555555556 |
| 5 | 1.388888889 |
| 10 | 2.777777778 |
| 100 | 27.77777778 |
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