A watt-hour (Wh) is the energy delivered by one watt of power sustained for one hour, equal to 3,600 joules.
Watt hours to Gigajoules
Convert Watt-hour (Wh) to Gigajoule (GJ) instantly with an exact formula, conversion table, and FAQ.
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Convert watt hours (Wh) 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 = Wh × 0.0000036
Results update instantly for Watt hours to Gigajoules conversions.
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Formula
GJ = Wh × 0.0000036
Wh = GJ × 277777.7778
Conversion table
| 1 Wh | 0.000004 GJ |
| 5 Wh | 0.000018 GJ |
| 10 Wh | 0.000036 GJ |
| 20 Wh | 0.000072 GJ |
| 50 Wh | 0.000180 GJ |
| 100 Wh | 0.000360 GJ |
| 500 Wh | 0.001800 GJ |
| 1000 Wh | 0.003600 GJ |
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How the formula works
Both watt-hour and gigajoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in watt hours by 0.0000036 to get gigajoules. To reverse the conversion, multiply a gigajoule value by 277777.7778 to get back to watt hours.
Frequently asked questions
What is Watt-hour (Wh)?
A watt-hour (Wh) is the energy delivered by one watt of power sustained for one hour, equal to 3,600 joules.
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 watt hours to gigajoules?
Multiply the watt-hour value by 0.0000036 to get the equivalent in gigajoules. For example, 5 Wh × 0.0000036 = 0.000018 GJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 0.0000036 is an exact, non-rounded value.
Can I convert gigajoules back to watt hours?
Yes. Divide the gigajoule value by 0.0000036, or multiply it by 277777.7778, to get watt hours.
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About converting watt hours to gigajoules
A watt-hour (Wh) is the energy delivered by one watt of power sustained for one hour, equal to 3,600 joules. 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 watt 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.