How to convert joules to kilowatt-hours
To convert joules to kilowatt-hours, multiply the value by the conversion factor 2.7778e-7. To go the other way, multiply by 3,600,000 (or divide by 2.7778e-7).
Worked example: 25 J to kWh
- Write the value: 25 J
- Multiply by 2.7778e-7: 25 × 2.7778e-7
- Result: 0.0000069444 kWh
Joule to Kilowatt-hour conversion table
Quick reference values, rounded to 6 significant digits.
| Joule (J) | Kilowatt-hour (kWh) |
|---|---|
| 0.1 J | 2.7778e-8 kWh |
| 0.25 J | 6.9444e-8 kWh |
| 0.5 J | 1.3889e-7 kWh |
| 1 J | 2.7778e-7 kWh |
| 2 J | 5.5556e-7 kWh |
| 3 J | 8.3333e-7 kWh |
| 4 J | 0.0000011111 kWh |
| 5 J | 0.0000013889 kWh |
| 6 J | 0.0000016667 kWh |
| 7 J | 0.0000019444 kWh |
| 8 J | 0.0000022222 kWh |
| 9 J | 0.0000025 kWh |
| 10 J | 0.0000027778 kWh |
| 12 J | 0.0000033333 kWh |
| 15 J | 0.0000041667 kWh |
| 20 J | 0.0000055556 kWh |
| 25 J | 0.0000069444 kWh |
| 30 J | 0.0000083333 kWh |
| 40 J | 0.0000111111 kWh |
| 50 J | 0.0000138889 kWh |
| 75 J | 0.0000208333 kWh |
| 100 J | 0.0000277778 kWh |
| 250 J | 0.0000694444 kWh |
| 500 J | 0.000138889 kWh |
| 1,000 J | 0.000277778 kWh |
Kilowatt-hour to Joule
| kWh | J |
|---|---|
| 1 kWh | 3,600,000 J |
| 5 kWh | 18,000,000 J |
| 10 kWh | 36,000,000 J |
| 50 kWh | 180,000,000 J |
| 100 kWh | 360,000,000 J |
1 Joule in other energy units
About Joule and Kilowatt-hour
What is a joule (J)?
The joule is the SI unit of energy.
What is a kilowatt-hour (kWh)?
A kilowatt-hour (one "unit" on your electricity bill) equals 3.6 million joules.
Where joule to kilowatt-hour conversion is used
Energy conversions are needed for electricity bills, food calories, heating, batteries and physics. Converting between joules and kilowatt-hours is especially common when you compare products, read foreign specifications, or fill in forms that expect a specific unit.
Need every unit at once? Use the full Energy Converter.
Frequently asked questions
How many kilowatt-hours are in 1 joule?
1 Joule equals 2.7778e-7 kWh.
How do I convert joules to kilowatt-hours?
Multiply the number of joules by 2.7778e-7. For example, 25 J × 2.7778e-7 = 0.0000069444 kWh.
What is 25 J in kWh?
25 J = 0.0000069444 kWh.
How many joules are in 1 kilowatt-hour?
1 Kilowatt-hour equals 3,600,000 J. Use the kWh to Joules converter for the reverse direction.
Is this Joule to Kilowatt-hour converter accurate?
Yes. It uses exact internationally defined conversion factors, calculated with full floating-point precision. Results are displayed rounded for readability.