Kilowatt-hours to joules
Type a value in kilowatt-hours to see it in joules 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 joules as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
J = kWh × 3,600,000
Multiply the value in kilowatt-hours by 3,600,000 to get joules.
Example
To convert 25 kWh to joules: 25 × 3,600,000 = 90,000,000 J.
Conversion table
| Kilowatt-hours (kWh) | Joules (J) |
|---|---|
| 1 | 3,600,000 |
| 2 | 7,200,000 |
| 3 | 10,800,000 |
| 5 | 18,000,000 |
| 10 | 36,000,000 |
| 20 | 72,000,000 |
| 25 | 90,000,000 |
| 50 | 180,000,000 |
| 100 | 360,000,000 |
| 250 | 900,000,000 |
| 500 | 1,800,000,000 |
| 1,000 | 3,600,000,000 |
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.
- Joule
- The SI unit of energy, equal to the work done by a force of one newton moving an object one meter.
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 joules are in one kilowatt-hour?
1 kWh = 3,600,000 J exactly.
How do I convert kilowatt-hours to joules?
Use J = kWh × 3,600,000. For example, 25 kWh = 90,000,000 J.
How many kilowatt-hours are in one joule?
1 J = 2.77778e-7 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.