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Convert kilowatt-hours to joules
Instant, accurate kWh → J conversion with a live converter, table and formula.
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1 kilowatt-hour = 3600000 joules
1 joule = 2.77778e-7 kilowatt-hours
kilowatt-hours to joules table
| kilowatt-hours (kWh) | joules (J) |
|---|---|
| 0.5 | 1800000 |
| 1 | 3600000 |
| 2 | 7200000 |
| 5 | 18000000 |
| 10 | 36000000 |
| 20 | 72000000 |
| 50 | 180000000 |
| 100 | 360000000 |
| 500 | 1800000000 |
| 1000 | 3600000000 |
Formula
joules = kilowatt-hours × 3600000.
Example
10 kilowatt-hours = 36000000 joules.
What is a kilowatt-hour?
A kilowatt-hour (kWh) is 1,000 watt-hours — the unit on your electricity bill.
What is a joule?
The joule (J) is the SI unit of energy.
Real-world reference points
A food Calorie is a kilocalorie: an apple is ~52 kcal, a daily diet ~2,000 kcal (~8.4 MJ).
| Reference | kilowatt-hours | joules |
|---|---|---|
| AA battery | 0.00428 kWh | 15,390 J |
| Smartphone battery (13 Wh) | 0.013 kWh | 46,800 J |
| Apple (52 kcal) | 0.0604 kWh | 218,000 J |
| Daily diet (2,000 kcal) | 2.32 kWh | 8,370,000 J |
| 1 kWh (unit of electricity) | 1 kWh | 3,600,000 J |
Mistakes to avoid with energy conversions
- Food 'Calories' are kilocalories — mixing cal and kcal creates 1000× errors.
- Confusing kWh (energy) with kW (power) on bills and appliance labels.
- Comparing battery mAh across different voltages — energy needs Wh, not mAh alone.
Frequently asked questions
How many joules in a kilowatt-hours?+
1 kilowatt-hour = 3600000 joules.
How do I convert kilowatt-hours to joules?+
Enter the value in the kilowatt-hours box above and the joules value appears instantly. You can also type in the joules box to convert the other way.
Is this kWh to J converter free?+
Yes — it is 100% free, needs no sign-up, and runs entirely in your browser.