Kilowatt-hours to kilojoules
Type a value in kilowatt-hours to see it in kilojoules 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 kilojoules as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
kJ = kWh × 3,600
Multiply the value in kilowatt-hours by 3,600 to get kilojoules.
Example
To convert 25 kWh to kilojoules: 25 × 3,600 = 90,000 kJ.
Conversion table
| Kilowatt-hours (kWh) | Kilojoules (kJ) |
|---|---|
| 1 | 3,600 |
| 2 | 7,200 |
| 3 | 10,800 |
| 5 | 18,000 |
| 10 | 36,000 |
| 20 | 72,000 |
| 25 | 90,000 |
| 50 | 180,000 |
| 100 | 360,000 |
| 250 | 900,000 |
| 500 | 1,800,000 |
| 1,000 | 3,600,000 |
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.
- Kilojoule
- Exactly 1000 joules. It appears on food labels next to the calorie figure.
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 kilojoules are in one kilowatt-hour?
1 kWh = 3,600 kJ exactly.
How do I convert kilowatt-hours to kilojoules?
Use kJ = kWh × 3,600. For example, 25 kWh = 90,000 kJ.
How many kilowatt-hours are in one kilojoule?
1 kJ = 0.000277778 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.