Kilowatt-hours to gigajoules
Type a value in kilowatt-hours to see it in gigajoules straight away, or type in the second box to convert back.
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How to use it
- Type the value in the kilowatt-hours box.
- Read the result in gigajoules as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
GJ = kWh × 0.0036
Multiply the value in kilowatt-hours by 0.0036 to get gigajoules.
Example
To convert 25 kWh to gigajoules: 25 × 0.0036 = 0.09 GJ.
Conversion table
| Kilowatt-hours (kWh) | Gigajoules (GJ) |
|---|---|
| 1 | 0.0036 |
| 2 | 0.0072 |
| 3 | 0.0108 |
| 5 | 0.018 |
| 10 | 0.036 |
| 20 | 0.072 |
| 25 | 0.09 |
| 50 | 0.18 |
| 100 | 0.36 |
| 250 | 0.9 |
| 500 | 1.8 |
| 1,000 | 3.6 |
About the units
- 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.
- Gigajoule
- Exactly one billion joules, used in natural gas pricing and energy statistics.
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 gigajoules are in one kilowatt-hour?
1 kWh = 0.0036 GJ exactly.
How do I convert kilowatt-hours to gigajoules?
Use GJ = kWh × 0.0036. For example, 25 kWh = 0.09 GJ.
How many kilowatt-hours are in one gigajoule?
1 GJ = 277.778 kWh.
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.