How to convert joules to kilowatt-hours
To convert joules (J) to kilowatt-hours (kWh), multiply the value in joules by 0.000000277777777778.
kWh = J × 0.000000277777777778
Example: 10 J = 0.000002777777778 kWh.
You can also type 10 J to kWh into the smart calculator, or mix units: 1 J + 1 kWh.
Joules to Kilowatt-Hours conversion table
| Joules | Kilowatt-Hours |
|---|---|
| 0.01 J | 2.7777778 × 10⁻⁹ kWh |
| 0.1 J | 2.7777778 × 10⁻⁸ kWh |
| 0.25 J | 6.9444444 × 10⁻⁸ kWh |
| 0.5 J | 0.00000013888889 kWh |
| 1 J | 0.00000027777778 kWh |
| 2 J | 0.00000055555556 kWh |
| 3 J | 0.00000083333333 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 |
| 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 |
| 60 J | 0.000016666667 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 |
Converting kilowatt-hours back to joules
1 kWh = 3,600,000 J. See the Kilowatt-Hours to Joules converter, or press the swap button above.
About the units
Joule (J)
The SI unit of energy: one newton acting over one meter.
Kilowatt-hour (kWh)
Exactly 3.6 megajoules: the "unit" on an electricity bill.
Energy is the capacity to do work. The SI unit is the joule. Food energy is labelled in kilocalories (Calories with a capital C) or kilojoules, electricity is billed in kilowatt-hours, and heating often uses BTU or therms.
Questions and answers
How many kilowatt-hours are in a joule?
One joule (J) equals 0.0000002777777778 kilowatt-hours (kWh).
How do I convert joules to kilowatt-hours?
To convert joules to kilowatt-hours, multiply the value in joules by 0.000000277777777778. The formula is kWh = J × 0.000000277777777778. For example, 10 J = 0.0000027777778 kWh.
What is 10 J in kWh?
10 joules is 0.000002777777778 kilowatt-hours.
Which is bigger, a joule or a kilowatt-hour?
A kilowatt-hour is bigger: 1 kWh = 3,600,000 J.
Are Calories on food labels the same as calories?
No. The food Calorie (capital C) is a kilocalorie: 1,000 small calories, or 4.184 kilojoules.
Does this J to kWh converter work offline?
Yes. ConvertEasy is a progressive web app: after your first visit it keeps working with no connection, and you can install it to your home screen from the browser menu.