Power and Energy
WhtoMJ
Convert watt-hours (Wh) to megajoules (MJ).
Factor1 Wh = 0.0036 MJ
Converter
Wh
Accepts numbers or expressions, e.g. 150 + 14.7
Result
MJ
Rendered to 6 significant figures.
Formula
Formula
MJ = Wh × 0.0036
Multiply any value in watt-hours by 0.0036 to obtain the value in megajoules.
Worked example
Convert 1000 Wh to MJ.
- 01Start with 1000 Wh.
- 02Multiply by the conversion factor: 1000 × 0.0036 = 3.6 MJ.
Result1000 Wh = 3.6 MJ
Conversion table
| Wh | MJ |
|---|---|
| 1 | 0.0036 |
| 2 | 0.0072 |
| 5 | 0.018 |
| 10 | 0.036 |
| 20 | 0.072 |
| 50 | 0.18 |
| 100 | 0.36 |
| 200 | 0.72 |
| 500 | 1.8 |
| 1000 | 3.6 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from Wh to MJ?
1 Wh equals 0.0036 MJ. To convert, multiply the value in watt-hours by 0.0036.
How do I convert 1 Wh to MJ?
1 Wh = 0.0036 MJ. For any value, multiply by 0.0036.
How do I convert MJ back to Wh?
Divide by the same factor — or equivalently, multiply by 277.7778. So 1 MJ = 277.778 Wh.
When would I need to convert watt-hour 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).