Convert megajoules to kilowatt-hours
Enter a value in megajoules (MJ) to get kilowatt-hours (kWh). One megajoule is 0.277778 kilowatt-hours; one kilowatt-hour is 3.6 megajoules.
How to use the Megajoule to kilowatt-hour
- Type the number of megajoules.
- Click Convert.
- Read the result in kilowatt-hours, plus the same value in every other energy unit.
MJ to kWh formula
kilowatt-hours = megajoules × 0.277778. To go the other way, megajoules = kilowatt-hours × 3.6 (see kilowatt-hours to megajoules).
Worked example
12 MJ × 0.277778 = 3.3333 kWh.
Megajoules to kilowatt-hours conversion table
| Megajoules | Kilowatt-hours |
|---|---|
| 0.1 MJ | 0.027778 kWh |
| 0.5 MJ | 0.138889 kWh |
| 1 MJ | 0.277778 kWh |
| 2 MJ | 0.555556 kWh |
| 3 MJ | 0.833333 kWh |
| 5 MJ | 1.3889 kWh |
| 10 MJ | 2.7778 kWh |
| 20 MJ | 5.5556 kWh |
| 25 MJ | 6.9444 kWh |
| 50 MJ | 13.8889 kWh |
| 100 MJ | 27.7778 kWh |
| 250 MJ | 69.4444 kWh |
| 500 MJ | 138.8889 kWh |
| 1,000 MJ | 277.7778 kWh |
About the megajoule
Gas bills in some countries and fuel energy content.
About the kilowatt-hour
The electricity billing unit: 1,000 W for one hour. Also EV battery capacity.
Related conversions
Frequently asked questions
How many kilowatt-hours in a megajoule?
0.277778 kilowatt-hours.
How many megajoules in a kilowatt-hour?
3.6 megajoules.
Is the factor exact?
The factor 0.277778 is derived from the units' exact definitions; only the display is rounded.
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Last updated 2026-09-23.