A kilowatt-hour (kWh) is the standard billing unit for electricity, equal to 1,000 watts sustained for one hour.
Kilowatt hours to Megajoules
Convert Kilowatt-hour (kWh) to Megajoule (MJ) instantly with an exact formula, conversion table, and FAQ.
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Convert kilowatt hours (kWh) to megajoules (MJ) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A megajoule (MJ) is a metric-prefixed unit of energy equal to 106 joules, using the SI mega prefix.
MJ = kWh × 3.6
Results update instantly for Kilowatt hours to Megajoules conversions.
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Formula
MJ = kWh × 3.6
kWh = MJ × 0.2777777778
Conversion table
| 1 kWh | 3.600000 MJ |
| 5 kWh | 18 MJ |
| 10 kWh | 36 MJ |
| 20 kWh | 72 MJ |
| 50 kWh | 180 MJ |
| 100 kWh | 360 MJ |
| 500 kWh | 1800 MJ |
| 1000 kWh | 3600 MJ |
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How the formula works
Both kilowatt-hour and megajoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in kilowatt hours by 3.6 to get megajoules. To reverse the conversion, multiply a megajoule value by 0.2777777778 to get back to kilowatt hours.
Frequently asked questions
What is Kilowatt-hour (kWh)?
A kilowatt-hour (kWh) is the standard billing unit for electricity, equal to 1,000 watts sustained for one hour.
What is Megajoule (MJ)?
A megajoule (MJ) is a metric-prefixed unit of energy equal to 106 joules, using the SI mega prefix.
How do I convert kilowatt hours to megajoules?
Multiply the kilowatt-hour value by 3.6 to get the equivalent in megajoules. For example, 5 kWh × 3.6 = 18 MJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 3.6 is an exact, non-rounded value.
Can I convert megajoules back to kilowatt hours?
Yes. Divide the megajoule value by 3.6, or multiply it by 0.2777777778, to get kilowatt hours.
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About converting kilowatt hours to megajoules
A kilowatt-hour (kWh) is the standard billing unit for electricity, equal to 1,000 watts sustained for one hour. A megajoule (MJ) is a metric-prefixed unit of energy equal to 106 joules, using the SI mega prefix.
Use this calculator to move between kilowatt hours and megajoules accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.