Convert Kilowatt-hour to Joule
1 kilowatt-hour = 3,600,000 joule (J). For example, 10 kilowatt-hour = 36,000,000 joule and 100 kilowatt-hour = 360,000,000 joule. Type any value below to convert kilowatt-hour to joule both ways — it runs entirely in your browser.
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Kilowatt-hour to Joule conversion formula
To convert kilowatt-hour to joule, multiply by 3,600,000:
joule = kilowatt-hour × 3,600,000
Going the other way, 1 joule = 2.7778e-7 kilowatt-hour, so
kilowatt-hour = joule × 2.7778e-7.
Kilowatt-hour to Joule — worked examples
| Kilowatt-hour | Joule |
|---|---|
| 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 |
| 25 kWh | 90,000,000 J |
| 50 kWh | 180,000,000 J |
| 100 kWh | 360,000,000 J |
Kilowatt-hour ↔ Joule reference table
| Kilowatt-hour → Joule | Joule → Kilowatt-hour |
|---|---|
| 1 kWh = 3,600,000 J | 1 J = 2.7778e-7 kWh |
| 2 kWh = 7,200,000 J | 2 J = 5.5556e-7 kWh |
| 5 kWh = 18,000,000 J | 5 J = 0.000001388889 kWh |
| 10 kWh = 36,000,000 J | 10 J = 0.000002777778 kWh |
| 20 kWh = 72,000,000 J | 20 J = 0.000005555556 kWh |
| 50 kWh = 180,000,000 J | 50 J = 0.00001388889 kWh |
| 100 kWh = 360,000,000 J | 100 J = 0.00002777778 kWh |
| 250 kWh = 900,000,000 J | 250 J = 0.00006944444 kWh |
| 500 kWh = 1,800,000,000 J | 500 J = 0.0001388889 kWh |
| 1000 kWh = 3,600,000,000 J | 1000 J = 0.0002777778 kWh |
About kilowatt-hour and joule
Kilowatt-hour: A kilowatt-hour is 1,000 watt-hours — exactly 3,600,000 joules (3.6 MJ). It is the "unit" your electricity meter bills.
Joule: The joule is the SI unit of energy — the work done by a force of one newton acting over one metre (1 J = 1 N·m), and also one watt-second.
Frequently asked questions
- How many joule are in 1 kilowatt-hour?
- 1 kilowatt-hour = 3,600,000 joule (J).
- How do I convert kilowatt-hour to joule?
- Multiply the number of kilowatt-hour by 3,600,000. For example, 10 kilowatt-hour = 10 × 3,600,000 = 36,000,000 joule.
- How many kilowatt-hour are in 1 joule?
- 1 joule = 2.7778e-7 kilowatt-hour.
- Which is bigger, kilowatt-hour or joule?
- 1 kilowatt-hour equals 3,600,000 joule, so a kilowatt-hour is the larger unit.