Power and Energy
GJtoMJ
Convert gigajoules (GJ) to megajoules (MJ).
Factor1 GJ = 1000 MJ
Converter
GJ
Accepts numbers or expressions, e.g. 150 + 14.7
Result
MJ
Rendered to 6 significant figures.
Formula
Formula
MJ = GJ × 1000
Multiply any value in gigajoules by 1000 to obtain the value in megajoules.
Worked example
Convert 1 GJ to MJ.
- 01Start with 1 GJ.
- 02Multiply by the conversion factor: 1 × 1000 = 1000 MJ.
Result1 GJ = 1000 MJ
Conversion table
| GJ | MJ |
|---|---|
| 1 | 1000 |
| 2 | 2000 |
| 5 | 5000 |
| 10 | 10000 |
| 20 | 20000 |
| 50 | 50000 |
| 100 | 1.0000e+5 |
| 200 | 2.0000e+5 |
| 500 | 5.0000e+5 |
| 1000 | 1.0000e+6 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from GJ to MJ?
1 GJ equals 1000 MJ. To convert, multiply the value in gigajoules by 1000.
How do I convert 1 GJ to MJ?
1 GJ = 1000 MJ. For any value, multiply by 1000.
How do I convert MJ back to GJ?
Divide by the same factor — or equivalently, multiply by 0.001. So 1 MJ = 0.001 GJ.
When would I need to convert gigajoule to megajoule?
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).