Kilowatt-hours to Megajoules Converter
One Kilowatt-hour equals 3.6 Megajoules (1 kWh = 3.6 MJ). Multiply a Kilowatt-hour value by 3.6 to get the equivalent in Megajoules. Use the calculator above for your value, or check the examples and reference table below.
Formula
MJ = kWh × 3.6
Multiply the Kilowatt-hour value by 3.6 to get the equivalent value in Megajoules.
Example Conversions
1 Kilowatt-hour (kWh)
3.6 Megajoule (MJ)
5 Kilowatt-hour (kWh)
18 Megajoule (MJ)
10 Kilowatt-hour (kWh)
36 Megajoule (MJ)
25 Kilowatt-hour (kWh)
90 Megajoule (MJ)
100 Kilowatt-hour (kWh)
360 Megajoule (MJ)
Conversion Table
| Kilowatt-hour (kWh) | Megajoule (MJ) |
|---|---|
| 0.1 | 0.36 |
| 0.5 | 1.8 |
| 1 | 3.6 |
| 2 | 7.2 |
| 5 | 18 |
| 10 | 36 |
| 25 | 90 |
| 50 | 180 |
| 100 | 360 |
| 250 | 900 |
| 500 | 1800 |
| 1000 | 3600 |
How to Convert Manually
Use these steps to convert Kilowatt-hour values to Megajoule without the calculator.
- Write down the value in Kilowatt-hour (kWh) that you want to convert.
- Multiply that value by 3.6.
- For example, 10 Kilowatt-hours × 3.6 = 36 Megajoules.
- Label the result as Megajoule (MJ).
Relative Size Comparison
This chart shows the visual difference in size between exactly one Kilowatt-hour and one Megajoule.
About Kilowatt-hour and Megajoule
The kilowatt-hour is exactly 3.6 megajoules. It is the unit on your electricity bill. Household consumption and electric vehicle battery sizes are stated in kilowatt-hours. The megajoule is one million joules. Fuel energy density, gas billing in some countries, and crash test energies are quoted in megajoules. One Kilowatt-hour equals 3.6 Megajoules (1 kWh = 3.6 MJ). Kilowatt-hour is used in electricity billing and in electric vehicle battery capacity. Megajoule is used in fuel energy density figures.
Precision and Rounding:Energy factors mix exact definitions (1 kWh = 3,600,000 J; 1 cal = 4.184 J thermochemical) with measured conventions (1 BTU ≈ 1,055.056 J). Nutrition and utility bills round to whole units; engineering heat calculations should keep the full factor until the final step.
Conversion factors per NIST Special Publication 811 and the BIPM SI Brochure (9th edition) (reference).
Worked Example
15Kilowatt-hours equals54Megajoules.
15 kWh × 3.6 = 54 MJ
FAQ
How do I convert Kilowatt-hour to Megajoule?
Multiply the Kilowatt-hour value by 3.6 to get the equivalent value in Megajoules.
What is the formula for Kilowatt-hour to Megajoule?
The formula is MJ = kWh × 3.6.
How many Megajoules are in 1 Kilowatt-hour?
1 Kilowatt-hour equals 3.6 Megajoules.
Can I convert Megajoule back to Kilowatt-hour?
Yes. 1 Megajoule equals 0.2777777778 Kilowatt-hours, and the related converter can reverse the calculation.
What are common names for Kilowatt-hour and Megajoule?
Kilowatt-hour is shown as kWh and may also be searched as kilowatt hour, kilowatt-hour, kwh. Megajoule is shown as MJ and may also be searched as megajoule, megajoules.
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