Convert Joules to Kilowatt-hours
J to kWh · energy conversion
What are joules and kilowatt-hours?
The joule is the SI unit of energy, the work done by one newton acting over one meter. A kilowatt-hour is 1,000 watt-hours, the unit electric utilities bill by. For reference: a food Calorie is one kilocalorie (4,184 J), and home electricity is billed in kilowatt-hours.
How to convert joules to kilowatt-hours
1 J = 2.7778e-7 kWh. To convert, multiply the number of joules by 2.7778e-7. For example, 5 J = 0.00000138889 kWh, and 20 J = 0.00000555556 kWh. To go the other way, multiply kilowatt-hours by 3,600,000 (since 1 kWh = 3,600,000 J).
Joules to Kilowatt-hours conversion table
| Joules (J) | Kilowatt-hours (kWh) |
|---|---|
| 1 | 2.7778e-7 |
| 10 | 0.00000277778 |
| 100 | 0.0000277778 |
| 500 | 0.000138889 |
| 1,000 | 0.000277778 |
| 2,000 | 0.000555556 |
| 5,000 | 0.00138889 |
FAQ
What is 1 J in kWh?
1 J = 2.7778e-7 kWh. To convert any amount, multiply the number of joules by 2.7778e-7.
How do I convert kilowatt-hours back to joules?
Go the other way: 1 kWh = 3,600,000 J, so multiply kilowatt-hours by 3,600,000 to get joules.
Is a joule bigger than a kilowatt-hour?
No — 1 J is the smaller unit, equal to 2.7778e-7 kWh (it takes 3,600,000 J to make one kWh).
Are these energy conversions exact?
They use the standard internationally-defined conversion factors. Results are rounded to six significant figures for readability, which is accurate enough for everyday and most technical use.