Kilowatt-hours to megajoules
Type a value in kilowatt-hours to see it in megajoules straight away, or type in the second box to convert back.
Loading the tool…
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 kilowatt-hours box.
- Read the result in megajoules as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
MJ = kWh × 3.6
Multiply the value in kilowatt-hours by 3.6 to get megajoules.
Example
To convert 25 kWh to megajoules: 25 × 3.6 = 90 MJ.
Conversion table
| Kilowatt-hours (kWh) | Megajoules (MJ) |
|---|---|
| 1 | 3.6 |
| 2 | 7.2 |
| 3 | 10.8 |
| 5 | 18 |
| 10 | 36 |
| 20 | 72 |
| 25 | 90 |
| 50 | 180 |
| 100 | 360 |
| 250 | 900 |
| 500 | 1,800 |
| 1,000 | 3,600 |
About the units
- 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.
- Megajoule
- Exactly one million joules, used for the heating value of fuels and gas.
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 megajoules are in one kilowatt-hour?
1 kWh = 3.6 MJ exactly.
How do I convert kilowatt-hours to megajoules?
Use MJ = kWh × 3.6. For example, 25 kWh = 90 MJ.
How many kilowatt-hours are in one megajoule?
1 MJ = 0.277778 kWh.
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.