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Power and Energy

GJtoMWh

Convert gigajoules (GJ) to megawatt-hours (MWh).

Factor1 GJ = 0.2777778 MWh

Converter

GJ

Accepts numbers or expressions, e.g. 150 + 14.7

Result
1MWh

Rendered to 6 significant figures.

Formula

Formula
MWh = GJ × 0.2777778

Multiply any value in gigajoules by 0.2777778 to obtain the value in megawatt-hours.

Worked example

Convert 3.6 GJ to MWh.

  1. 01Start with 3.6 GJ.
  2. 02Multiply by the conversion factor: 3.6 × 0.2777778 = 1 MWh.
Result3.6 GJ = 1 MWh

Conversion table

GJMWh
10.27778
20.55556
51.3889
102.7778
205.5556
5013.889
10027.778
20055.556
500138.89
1000277.78

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from GJ to MWh?
1 GJ equals 0.2777778 MWh. To convert, multiply the value in gigajoules by 0.2777778.
How do I convert 1 GJ to MWh?
1 GJ = 0.277778 MWh. For any value, multiply by 0.2777778.
How do I convert MWh back to GJ?
Divide by the same factor — or equivalently, multiply by 3.6. So 1 MWh = 3.6 GJ.
When would I need to convert gigajoule to megawatt-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).

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