A kilowatt-hour (kWh) is the standard billing unit for electricity, equal to 1,000 watts sustained for one hour.
Kilowatt hours to Kilojoules
Convert Kilowatt-hour (kWh) to Kilojoule (kJ) instantly with an exact formula, conversion table, and FAQ.
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Convert kilowatt hours (kWh) to kilojoules (kJ) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A kilojoule (kJ) equals 1,000 joules and is commonly used on nutrition labels outside the United States.
kJ = kWh × 3600
Results update instantly for Kilowatt hours to Kilojoules conversions.
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Formula
kJ = kWh × 3600
kWh = kJ × 0.0002777777778
Conversion table
| 1 kWh | 3600 kJ |
| 5 kWh | 18000 kJ |
| 10 kWh | 36000 kJ |
| 20 kWh | 72000 kJ |
| 50 kWh | 180000 kJ |
| 100 kWh | 360000 kJ |
| 500 kWh | 1.800000e+06 kJ |
| 1000 kWh | 3.600000e+06 kJ |
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How the formula works
Both kilowatt-hour and kilojoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in kilowatt hours by 3600 to get kilojoules. To reverse the conversion, multiply a kilojoule value by 0.0002777777778 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 Kilojoule (kJ)?
A kilojoule (kJ) equals 1,000 joules and is commonly used on nutrition labels outside the United States.
How do I convert kilowatt hours to kilojoules?
Multiply the kilowatt-hour value by 3600 to get the equivalent in kilojoules. For example, 5 kWh × 3600 = 18000 kJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 3600 is an exact, non-rounded value.
Can I convert kilojoules back to kilowatt hours?
Yes. Divide the kilojoule value by 3600, or multiply it by 0.0002777777778, to get kilowatt hours.
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About converting kilowatt hours to kilojoules
A kilowatt-hour (kWh) is the standard billing unit for electricity, equal to 1,000 watts sustained for one hour. A kilojoule (kJ) equals 1,000 joules and is commonly used on nutrition labels outside the United States.
Use this calculator to move between kilowatt hours and kilojoules accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.