How to convert kilowatt-hours to joules
J = kWh × 3,600,000Multiply the value in kilowatt-hours by 3,600,000. To go the other way, multiply by 2.777777778×10⁻⁷ (or divide by 3,600,000).
A kilowatt-hour is larger than a joule: one kilowatt-hour contains 3,600,000 joules.
Worked examples
- 1 kilowatt-hour1 kWh × 3,600,000 = 3,600,000 J
- 5 kilowatt-hours5 kWh × 3,600,000 = 18,000,000 J
- 10 kilowatt-hours10 kWh × 3,600,000 = 36,000,000 J
- 20 kilowatt-hours20 kWh × 3,600,000 = 72,000,000 J
- 100 kilowatt-hours100 kWh × 3,600,000 = 360,000,000 J
Kilowatt-hours to joules conversion table
Values are calculated by the conversion engine and rounded to 8 significant figures.
| Kilowatt-hours (kWh) | Joules (J) |
|---|---|
| 0.1 kWh | 360,000 J |
| 0.25 kWh | 900,000 J |
| 0.5 kWh | 1,800,000 J |
| 1 kWh | 3,600,000 J |
| 2 kWh | 7,200,000 J |
| 3 kWh | 10,800,000 J |
| 4 kWh | 14,400,000 J |
| 5 kWh | 18,000,000 J |
| 6 kWh | 21,600,000 J |
| 7 kWh | 25,200,000 J |
| 8 kWh | 28,800,000 J |
| 9 kWh | 32,400,000 J |
| 10 kWh | 36,000,000 J |
| Kilowatt-hours (kWh) | Joules (J) |
|---|---|
| 12 kWh | 43,200,000 J |
| 15 kWh | 54,000,000 J |
| 20 kWh | 72,000,000 J |
| 25 kWh | 90,000,000 J |
| 30 kWh | 108,000,000 J |
| 40 kWh | 144,000,000 J |
| 50 kWh | 180,000,000 J |
| 75 kWh | 270,000,000 J |
| 100 kWh | 360,000,000 J |
| 250 kWh | 900,000,000 J |
| 500 kWh | 1,800,000,000 J |
| 1,000 kWh | 3,600,000,000 J |
About the units
Kilowatt-hour (kWh)
Exactly 3.6 MJ. The unit on electricity bills; running a 1,000 W heater for an hour uses 1 kWh. One kilowatt-hour equals 3,600,000 joules (J).
Joule (J)
The SI unit of energy: the work done by a force of one newton over one metre, or one watt for one second. Lifting an apple by one metre takes about 1 J.
Frequently asked questions
How many joules are in one kilowatt-hour?
There are 3,600,000 joules in one kilowatt-hour, and this value is exact by definition.
How do I convert kilowatt-hours to joules?
Multiply the number of kilowatt-hours by 3,600,000. For example, 10 kWh × 3,600,000 = 36,000,000 J.
How many kilowatt-hours are in one joule?
One joule equals 2.777777778×10⁻⁷ kilowatt-hours. That is the reverse factor, 1 ÷ 3,600,000.
What is 10 kilowatt-hours in joules?
10 kWh = 36,000,000 J.
Is this kWh to J converter accurate?
Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.