How to convert kilowatt-hours to joules
To convert kilowatt-hours to joules, multiply the value by the conversion factor 3,600,000. To go the other way, multiply by 2.7778e-7 (or divide by 3,600,000).
Worked example: 25 kWh to J
- Write the value: 25 kWh
- Multiply by 3,600,000: 25 × 3,600,000
- Result: 90,000,000 J
Kilowatt-hour to Joule conversion table
Quick reference values, rounded to 6 significant digits.
| Kilowatt-hour (kWh) | Joule (J) |
|---|---|
| 0.001 kWh | 3,600 J |
| 0.005 kWh | 18,000 J |
| 0.01 kWh | 36,000 J |
| 0.05 kWh | 180,000 J |
| 0.1 kWh | 360,000 J |
| 0.25 kWh | 900,000 J |
| 0.5 kWh | 1,800,000 J |
| 1 kWh | 3,600,000 J |
| 2 kWh | 7,200,000 J |
| 3 kWh | 10,800,000 J |
| 5 kWh | 18,000,000 J |
| 10 kWh | 36,000,000 J |
| 20 kWh | 72,000,000 J |
| 50 kWh | 180,000,000 J |
| 100 kWh | 360,000,000 J |
Joule to Kilowatt-hour
| J | kWh |
|---|---|
| 1 J | 2.7778e-7 kWh |
| 5 J | 0.0000013889 kWh |
| 10 J | 0.0000027778 kWh |
| 50 J | 0.0000138889 kWh |
| 100 J | 0.0000277778 kWh |
1 Kilowatt-hour in other energy units
About Kilowatt-hour and Joule
What is a kilowatt-hour (kWh)?
A kilowatt-hour (one "unit" on your electricity bill) equals 3.6 million joules.
What is a joule (J)?
The joule is the SI unit of energy.
Where kilowatt-hour to joule conversion is used
Energy conversions are needed for electricity bills, food calories, heating, batteries and physics. Converting between kilowatt-hours and joules 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 joules are in 1 kilowatt-hour?
1 Kilowatt-hour equals 3,600,000 J.
How do I convert kilowatt-hours to joules?
Multiply the number of kilowatt-hours by 3,600,000. For example, 25 kWh × 3,600,000 = 90,000,000 J.
What is 25 kWh in J?
25 kWh = 90,000,000 J.
How many kilowatt-hours are in 1 joule?
1 Joule equals 2.7778e-7 kWh. Use the Joules to kWh converter for the reverse direction.
Is this Kilowatt-hour to Joule converter accurate?
Yes. It uses exact internationally defined conversion factors, calculated with full floating-point precision. Results are displayed rounded for readability.