Gigajoules to kilowatt-hours
Type a value in gigajoules to see it in kilowatt-hours straight away, or type in the second box to convert back.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Type the value in the gigajoules box.
- Read the result in kilowatt-hours as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
kWh = GJ × 277.7777778
Multiply the value in gigajoules by 277.7777778 to get kilowatt-hours.
Example
To convert 25 GJ to kilowatt-hours: 25 × 277.7777778 = 6,944.44 kWh.
Conversion table
| Gigajoules (GJ) | Kilowatt-hours (kWh) |
|---|---|
| 1 | 277.778 |
| 2 | 555.556 |
| 3 | 833.333 |
| 5 | 1,388.89 |
| 10 | 2,777.78 |
| 20 | 5,555.56 |
| 25 | 6,944.44 |
| 50 | 13,888.9 |
| 100 | 27,777.8 |
| 250 | 69,444.4 |
| 500 | 138,889 |
| 1,000 | 277,778 |
About the units
- Gigajoule
- Exactly one billion joules, used in natural gas pricing and energy statistics.
- Kilowatt-hour
- The energy used by a 1000 watt device in one hour, exactly 3.6 million joules. Electricity bills are charged in this unit.
Limits and caveats
- Results are rounded for display and computed with the browser's floating point precision (about 15 significant digits).
- Both unit factors are exact by their official definitions.
Questions about this tool
How many kilowatt-hours are in one gigajoule?
1 GJ = 277.778 kWh exactly.
How do I convert gigajoules to kilowatt-hours?
Use kWh = GJ × 277.7777778. For example, 25 GJ = 6,944.44 kWh.
How many gigajoules are in one kilowatt-hour?
1 kWh = 0.0036 GJ.
Which calorie do these converters use?
The thermochemical calorie, exactly 4.184 joules, the factor many countries use to turn kcal into kJ on food labels. The International Table calorie is 4.1868 joules, less than 0.07% larger.
What is the difference between kW and kWh?
A kilowatt is a unit of power, the rate of using energy, while a kilowatt-hour is an amount of energy. A 2 kW heater running for three hours uses 6 kWh.