A kilowatt-hour (kWh) is the standard billing unit for electricity, equal to 1,000 watts sustained for one hour.
Kilowatt hours to Gigajoules
Convert Kilowatt-hour (kWh) to Gigajoule (GJ) instantly with an exact formula, conversion table, and FAQ.
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Convert kilowatt hours (kWh) to gigajoules (GJ) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A gigajoule (GJ) is a metric-prefixed unit of energy equal to 109 joules, using the SI giga prefix.
GJ = kWh × 0.0036
Results update instantly for Kilowatt hours to Gigajoules conversions.
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Formula
GJ = kWh × 0.0036
kWh = GJ × 277.7777778
Conversion table
| 1 kWh | 0.003600 GJ |
| 5 kWh | 0.018000 GJ |
| 10 kWh | 0.036000 GJ |
| 20 kWh | 0.072000 GJ |
| 50 kWh | 0.180000 GJ |
| 100 kWh | 0.360000 GJ |
| 500 kWh | 1.800000 GJ |
| 1000 kWh | 3.600000 GJ |
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How the formula works
Both kilowatt-hour and gigajoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in kilowatt hours by 0.0036 to get gigajoules. To reverse the conversion, multiply a gigajoule value by 277.7777778 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 Gigajoule (GJ)?
A gigajoule (GJ) is a metric-prefixed unit of energy equal to 109 joules, using the SI giga prefix.
How do I convert kilowatt hours to gigajoules?
Multiply the kilowatt-hour value by 0.0036 to get the equivalent in gigajoules. For example, 5 kWh × 0.0036 = 0.018000 GJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 0.0036 is an exact, non-rounded value.
Can I convert gigajoules back to kilowatt hours?
Yes. Divide the gigajoule value by 0.0036, or multiply it by 277.7777778, to get kilowatt hours.
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About converting kilowatt hours to gigajoules
A kilowatt-hour (kWh) is the standard billing unit for electricity, equal to 1,000 watts sustained for one hour. A gigajoule (GJ) is a metric-prefixed unit of energy equal to 109 joules, using the SI giga prefix.
Use this calculator to move between kilowatt hours and gigajoules accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.