Megajoules to kilowatt-hours
Type a value in megajoules to see it in kilowatt-hours straight away, or type in the second box to convert back.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Type the value in the megajoules box.
- Read the result in kilowatt-hours as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
kWh = MJ × 0.2777777778
Multiply the value in megajoules by 0.2777777778 to get kilowatt-hours.
Example
To convert 25 MJ to kilowatt-hours: 25 × 0.2777777778 = 6.94444 kWh.
Conversion table
| Megajoules (MJ) | Kilowatt-hours (kWh) |
|---|---|
| 1 | 0.277778 |
| 2 | 0.555556 |
| 3 | 0.833333 |
| 5 | 1.38889 |
| 10 | 2.77778 |
| 20 | 5.55556 |
| 25 | 6.94444 |
| 50 | 13.8889 |
| 100 | 27.7778 |
| 250 | 69.4444 |
| 500 | 138.889 |
| 1,000 | 277.778 |
About the units
- Megajoule
- Exactly one million joules, used for the heating value of fuels and gas.
- Kilowatt-hour
- The energy used by a 1000 watt device in one hour, exactly 3.6 million joules. Electricity bills are charged in this unit.
Limits and caveats
- Results are rounded for display and computed with the browser's floating point precision (about 15 significant digits).
- Both unit factors are exact by their official definitions.
Questions about this tool
How many kilowatt-hours are in one megajoule?
1 MJ = 0.277778 kWh exactly.
How do I convert megajoules to kilowatt-hours?
Use kWh = MJ × 0.2777777778. For example, 25 MJ = 6.94444 kWh.
How many megajoules are in one kilowatt-hour?
1 kWh = 3.6 MJ.
Which calorie do these converters use?
The thermochemical calorie, exactly 4.184 joules, the factor many countries use to turn kcal into kJ on food labels. The International Table calorie is 4.1868 joules, less than 0.07% larger.
What is the difference between kW and kWh?
A kilowatt is a unit of power, the rate of using energy, while a kilowatt-hour is an amount of energy. A 2 kW heater running for three hours uses 6 kWh.