Kilowatt-hour to Joule
1 kWh = 3600000 J
How to convert kilowatt-hour to joule
Enter the value in kilowatt-hour (kWh) above and the equivalent in joule (J) updates as you type. This conversion comes up when understanding electricity bills (kWh) versus heater labels (BTU).
- One kWh runs a 2,000 W heater for 30 minutes → that is 3600000 J in joule.
Typical situations: comparing food energy: calories vs kilojoules on imported packaging; sizing power banks and EV batteries (Wh, kWh).
You can also convert in the other direction: Joule to Kilowatt-hour
Kilowatt-hour to Joule conversion table
| Kilowatt-hour (kWh) | Joule (J) |
|---|---|
| 1 | 3600000 |
| 2 | 7200000 |
| 5 | 18000000 |
| 10 | 36000000 |
| 25 | 90000000 |
| 50 | 180000000 |
| 100 | 360000000 |
Watch out for
- Calorie (food) vs calorie (physics): food labels mean kilocalories, a factor of 1,000
- Power (kW) vs energy (kWh): a 5 kW heater running 2 hours uses 10 kWh
Frequently asked questions
How many joules is 1 kilowatt-hour?
1 kilowatt-hour = 3600000 joules.
What is the formula to convert kilowatt-hour to joules?
The formula is: J = kWh × 3600000.
What is 10 kilowatt-hours in joules?
10 kilowatt-hours = 36000000 joules.