The joule (J) is the SI derived unit of energy, equal to the work done when a force of one newton acts over one meter.
Joules to Kilowatt hours
Convert Joule (J) to Kilowatt-hour (kWh) instantly with an exact formula, conversion table, and FAQ.
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Convert joules (J) 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 = J × 2.777777778e-07
Results update instantly for Joules to Kilowatt hours conversions.
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Formula
kWh = J × 2.777777778e-07
J = kWh × 3600000
Conversion table
| 1 J | 2.777778e-07 kWh |
| 5 J | 1.388889e-06 kWh |
| 10 J | 2.777778e-06 kWh |
| 20 J | 5.555556e-06 kWh |
| 50 J | 1.388889e-05 kWh |
| 100 J | 2.777778e-05 kWh |
| 500 J | 0.000139 kWh |
| 1000 J | 0.000278 kWh |
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How the formula works
Both joule and kilowatt-hour measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in joules by 2.777777778e-07 to get kilowatt-hours. To reverse the conversion, multiply a kilowatt-hour value by 3600000 to get back to joules.
Frequently asked questions
What is Joule (J)?
The joule (J) is the SI derived unit of energy, equal to the work done when a force of one newton acts over one meter.
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 joules to kilowatt-hours?
Multiply the joule value by 2.777777778e-07 to get the equivalent in kilowatt-hours. For example, 5 J × 2.777777778e-07 = 1.388889e-06 kWh.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 2.777777778e-07 is an exact, non-rounded value.
Can I convert kilowatt-hours back to joules?
Yes. Divide the kilowatt-hour value by 2.777777778e-07, or multiply it by 3600000, to get joules.
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About converting joules to kilowatt-hours
The joule (J) is the SI derived unit of energy, equal to the work done when a force of one newton acts over one meter. 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 joules 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.