Convert joules to kilowatt-hours
Joule (J) to kilowatt-hour (kWh). One joule equals 2.777778e-7 kilowatt-hours.
Formula
Joule to kilowatt-hour conversion table
| Joules | Kilowatt-hours | Kilowatt-hours | Joules |
|---|---|---|---|
| 1 J | 2.777778e-7 kWh | 1 kWh | 3600000 J |
| 2 J | 5.555556e-7 kWh | 2 kWh | 7200000 J |
| 3 J | 8.333333e-7 kWh | 3 kWh | 10800000 J |
| 5 J | 0.000001 kWh | 5 kWh | 18000000 J |
| 10 J | 0.000003 kWh | 10 kWh | 36000000 J |
| 20 J | 0.000006 kWh | 20 kWh | 72000000 J |
| 50 J | 0.000014 kWh | 50 kWh | 180000000 J |
| 100 J | 0.000028 kWh | 100 kWh | 360000000 J |
| 500 J | 0.000139 kWh | 500 kWh | 1800000000 J |
| 1000 J | 0.000278 kWh | 1000 kWh | 3600000000 J |
To convert joules to kilowatt-hours, divide the number of joules by 3600000. One joule equals 2.777778e-7 kilowatt-hours, and one kilowatt-hour equals 3600000 joules, so the relationship is fixed and exact. As a worked example, 10 J comes to 0.000003 kWh. Enter your own figure in the converter above to get an instant answer, or use the swap button to flip the direction. This is a energy conversion, and like every tool on UnitGlide it runs locally in your browser with no account or upload required. The table further down shows a range of common joule values already worked out in kilowatt-hours, plus the reverse kilowatt-hour to joule direction, which is handy for quick reference or double-checking a result by hand.
Frequently asked questions
How many kilowatt-hours are in a joule?
One joule equals 2.777778e-7 kilowatt-hours. The ratio is constant, so you can multiply any number of joules by 2.777778e-7 to get kilowatt-hours.
What is the formula to convert joules to kilowatt-hours?
Use kilowatt-hours = joules ÷ 3600000. UnitGlide applies this exact formula for every value, so results stay accurate across the whole range.
How do I convert kilowatt-hours back to joules?
Go the other way by using one kilowatt-hour equals 3600000 joules. You can also press the swap button in the converter above to flip the direction in one click.
Is this joule to kilowatt-hour converter accurate?
Yes. It uses internationally defined SI conversion factors, as maintained by the BIPM, and all math runs in your browser so nothing is rounded away on a server. For everyday use the displayed precision is more than enough.