A gigajoule (GJ) is a metric-prefixed unit of energy equal to 109 joules, using the SI giga prefix.
Gigajoules to Kilowatt hours
Convert Gigajoule (GJ) to Kilowatt-hour (kWh) instantly with an exact formula, conversion table, and FAQ.
Reserved for a responsive leaderboard above the conversion details.
Professional calculator style
World-scale conversion engine
30+ categories
6,500+ units
Instant results
Offline ready
Energy calculator
Energy Converter
Convert gigajoules (GJ) 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 = GJ × 277.7777778
Results update instantly for Gigajoules to Kilowatt hours conversions.
Reserved above the conversion cards and below the converter.
Formula
kWh = GJ × 277.7777778
GJ = kWh × 0.0036
Conversion table
| 1 GJ | 277.777778 kWh |
| 5 GJ | 1388.888889 kWh |
| 10 GJ | 2777.777778 kWh |
| 20 GJ | 5555.555556 kWh |
| 50 GJ | 13888.888889 kWh |
| 100 GJ | 27777.777778 kWh |
| 500 GJ | 138888.888889 kWh |
| 1000 GJ | 277777.777778 kWh |
Related conversions
Reserved between the cards and the FAQ so the page stays balanced.
How the formula works
Both gigajoule and kilowatt-hour measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in gigajoules by 277.7777778 to get kilowatt hours. To reverse the conversion, multiply a kilowatt-hour value by 0.0036 to get back to gigajoules.
Frequently asked questions
What is Gigajoule (GJ)?
A gigajoule (GJ) is a metric-prefixed unit of energy equal to 109 joules, using the SI giga prefix.
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 gigajoules to kilowatt hours?
Multiply the gigajoule value by 277.7777778 to get the equivalent in kilowatt hours. For example, 5 GJ × 277.7777778 = 1388.888889 kWh.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 277.7777778 is an exact, non-rounded value.
Can I convert kilowatt hours back to gigajoules?
Yes. Divide the kilowatt-hour value by 277.7777778, or multiply it by 0.0036, to get gigajoules.
Reserved between the FAQ and the article so the page stays balanced.
About converting gigajoules to kilowatt hours
A gigajoule (GJ) is a metric-prefixed unit of energy equal to 109 joules, using the SI giga prefix. 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 gigajoules 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.