kWh to Joules Converter
Convert kilowatt-hours (kWh) to joules (J) instantly. Type a value — the result updates as you type, and the swap button converts the other way.
kWh to Joules formula
J = kWh × 3600000
1 kilowatt-hour = 3600000 joules · 1 joule = 2.78e-7 kilowatt-hours
To convert kilowatt-hours to joules, multiply the value by 3600000. For example, 1 kWh:
J = 1 × 3600000J = 3600000
So 1 kWh = 3600000 J.
Mental math shortcut
This conversion is exact, so there is no need to estimate: just multiply by 3,600,000.
kWh to Joules conversion table
Joules back to kWh
The same values converted the other way, rounded for everyday use:
| Joules | Kilowatt-hours |
|---|---|
| 3600 J | 0.001 kWh |
| 360000 J | 0.1 kWh |
| 3600000 J | 1 kWh |
| 36000000 J | 10 kWh |
| 360000000 J | 100 kWh |
About the units
Kilowatt-hours (kWh)
A kilowatt-hour is 1,000 watts used for one hour (3.6 million joules). Electricity is billed per kWh.
Joules (J)
The joule is the SI unit of energy. One food Calorie (kcal) equals 4,184 joules.
Frequently asked questions
How many joules are in a kilowatt-hour?
One kilowatt-hour equals 3600000 joules.
What is 1 kWh in Joules?
1 kWh = 3600000 J.
How do I convert Joules back to kWh?
Divide the joules by 3600000.