How to convert joules to kilowatt-hours
kWh = J × 2.777777778×10⁻⁷Because one kilowatt-hour equals 3,600,000 joules, you can also divide: kWh = J ÷ 3,600,000.
A joule is smaller than a kilowatt-hour: it takes 3,600,000 joules to make one kilowatt-hour.
Worked examples
- 1 joule1 J × 2.777777778×10⁻⁷ = 2.777777778×10⁻⁷ kWh
- 5 joules5 J × 2.777777778×10⁻⁷ = 0.000001388888889 kWh
- 10 joules10 J × 2.777777778×10⁻⁷ = 0.000002777777778 kWh
- 20 joules20 J × 2.777777778×10⁻⁷ = 0.000005555555556 kWh
- 100 joules100 J × 2.777777778×10⁻⁷ = 0.00002777777778 kWh
Joules to kilowatt-hours conversion table
Values are calculated by the conversion engine and rounded to 8 significant figures.
| Joules (J) | Kilowatt-hours (kWh) |
|---|---|
| 0.1 J | 2.7777778×10⁻⁸ kWh |
| 0.25 J | 6.9444444×10⁻⁸ kWh |
| 0.5 J | 1.3888889×10⁻⁷ kWh |
| 1 J | 2.7777778×10⁻⁷ kWh |
| 2 J | 5.5555556×10⁻⁷ kWh |
| 3 J | 8.3333333×10⁻⁷ kWh |
| 4 J | 0.0000011111111 kWh |
| 5 J | 0.0000013888889 kWh |
| 6 J | 0.0000016666667 kWh |
| 7 J | 0.0000019444444 kWh |
| 8 J | 0.0000022222222 kWh |
| 9 J | 0.0000025 kWh |
| 10 J | 0.0000027777778 kWh |
| Joules (J) | Kilowatt-hours (kWh) |
|---|---|
| 12 J | 0.0000033333333 kWh |
| 15 J | 0.0000041666667 kWh |
| 20 J | 0.0000055555556 kWh |
| 25 J | 0.0000069444444 kWh |
| 30 J | 0.0000083333333 kWh |
| 40 J | 0.000011111111 kWh |
| 50 J | 0.000013888889 kWh |
| 75 J | 0.000020833333 kWh |
| 100 J | 0.000027777778 kWh |
| 250 J | 0.000069444444 kWh |
| 500 J | 0.00013888889 kWh |
| 1,000 J | 0.00027777778 kWh |
About the units
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.
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).
Frequently asked questions
How many kilowatt-hours are in one joule?
There are 2.777777778×10⁻⁷ kilowatt-hours in one joule, and this value is exact by definition.
How do I convert joules to kilowatt-hours?
Multiply the number of joules by 2.777777778×10⁻⁷. For example, 10 J × 2.777777778×10⁻⁷ = 0.000002777777778 kWh.
How many joules are in one kilowatt-hour?
One kilowatt-hour equals 3,600,000 joules. That is the reverse factor, 1 ÷ 2.777777778×10⁻⁷.
What is 10 joules in kilowatt-hours?
10 J = 0.000002777777778 kWh.
Is this J to kWh 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.