A megajoule (MJ) is a metric-prefixed unit of energy equal to 106 joules, using the SI mega prefix.
Megajoules to Kilowatt hours
Convert Megajoule (MJ) to Kilowatt-hour (kWh) instantly with an exact formula, conversion table, and FAQ.
Reserved for a responsive leaderboard above the conversion details.
Professional calculator style
World-scale conversion engine
30+ categories
6,500+ units
Instant results
Offline ready
Energy calculator
Energy Converter
Convert megajoules (MJ) to kilowatt hours (kWh) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A kilowatt-hour (kWh) is the standard billing unit for electricity, equal to 1,000 watts sustained for one hour.
kWh = MJ × 0.2777777778
Results update instantly for Megajoules to Kilowatt hours conversions.
Reserved above the conversion cards and below the converter.
Formula
kWh = MJ × 0.2777777778
MJ = kWh × 3.6
Conversion table
| 1 MJ | 0.277778 kWh |
| 5 MJ | 1.388889 kWh |
| 10 MJ | 2.777778 kWh |
| 20 MJ | 5.555556 kWh |
| 50 MJ | 13.888889 kWh |
| 100 MJ | 27.777778 kWh |
| 500 MJ | 138.888889 kWh |
| 1000 MJ | 277.777778 kWh |
Related conversions
Reserved between the cards and the FAQ so the page stays balanced.
How the formula works
Both megajoule and kilowatt-hour measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in megajoules by 0.2777777778 to get kilowatt hours. To reverse the conversion, multiply a kilowatt-hour value by 3.6 to get back to megajoules.
Frequently asked questions
What is Megajoule (MJ)?
A megajoule (MJ) is a metric-prefixed unit of energy equal to 106 joules, using the SI mega prefix.
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.
How do I convert megajoules to kilowatt hours?
Multiply the megajoule value by 0.2777777778 to get the equivalent in kilowatt hours. For example, 5 MJ × 0.2777777778 = 1.388889 kWh.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 0.2777777778 is an exact, non-rounded value.
Can I convert kilowatt hours back to megajoules?
Yes. Divide the kilowatt-hour value by 0.2777777778, or multiply it by 3.6, to get megajoules.
Reserved between the FAQ and the article so the page stays balanced.
About converting megajoules to kilowatt hours
A megajoule (MJ) is a metric-prefixed unit of energy equal to 106 joules, using the SI mega prefix. A kilowatt-hour (kWh) is the standard billing unit for electricity, equal to 1,000 watts sustained for one hour.
Use this calculator to move between megajoules and kilowatt hours accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.