A kilojoule (kJ) equals 1,000 joules and is commonly used on nutrition labels outside the United States.
Kilojoules to Kilowatt hours
Convert Kilojoule (kJ) to Kilowatt-hour (kWh) instantly with an exact formula, conversion table, and FAQ.
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Convert kilojoules (kJ) 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 = kJ × 0.0002777777778
Results update instantly for Kilojoules to Kilowatt hours conversions.
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Formula
kWh = kJ × 0.0002777777778
kJ = kWh × 3600
Conversion table
| 1 kJ | 0.000278 kWh |
| 5 kJ | 0.001389 kWh |
| 10 kJ | 0.002778 kWh |
| 20 kJ | 0.005556 kWh |
| 50 kJ | 0.013889 kWh |
| 100 kJ | 0.027778 kWh |
| 500 kJ | 0.138889 kWh |
| 1000 kJ | 0.277778 kWh |
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How the formula works
Both kilojoule and kilowatt-hour measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in kilojoules by 0.0002777777778 to get kilowatt hours. To reverse the conversion, multiply a kilowatt-hour value by 3600 to get back to kilojoules.
Frequently asked questions
What is Kilojoule (kJ)?
A kilojoule (kJ) equals 1,000 joules and is commonly used on nutrition labels outside the United States.
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 kilojoules to kilowatt hours?
Multiply the kilojoule value by 0.0002777777778 to get the equivalent in kilowatt hours. For example, 5 kJ × 0.0002777777778 = 0.001389 kWh.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 0.0002777777778 is an exact, non-rounded value.
Can I convert kilowatt hours back to kilojoules?
Yes. Divide the kilowatt-hour value by 0.0002777777778, or multiply it by 3600, to get kilojoules.
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About converting kilojoules to kilowatt hours
A kilojoule (kJ) equals 1,000 joules and is commonly used on nutrition labels outside the United States. 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 kilojoules 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.