Convert Watt-hour to Joule
1 watt-hour = 3,600 joule (J). For example, 10 watt-hour = 36,000 joule and 100 watt-hour = 360,000 joule. Type any value below to convert watt-hour to joule both ways — it runs entirely in your browser.
Watt-hour to Joule conversion formula
To convert watt-hour to joule, multiply by 3,600:
joule = watt-hour × 3,600
Going the other way, 1 joule = 0.0002777778 watt-hour, so
watt-hour = joule × 0.0002777778.
Watt-hour to Joule — worked examples
| Watt-hour | Joule |
|---|---|
| 1 Wh | 3,600 J |
| 2 Wh | 7,200 J |
| 3 Wh | 10,800 J |
| 5 Wh | 18,000 J |
| 10 Wh | 36,000 J |
| 25 Wh | 90,000 J |
| 50 Wh | 180,000 J |
| 100 Wh | 360,000 J |
Watt-hour ↔ Joule reference table
| Watt-hour → Joule | Joule → Watt-hour |
|---|---|
| 1 Wh = 3,600 J | 1 J = 0.0002777778 Wh |
| 2 Wh = 7,200 J | 2 J = 0.0005555556 Wh |
| 5 Wh = 18,000 J | 5 J = 0.001388889 Wh |
| 10 Wh = 36,000 J | 10 J = 0.002777778 Wh |
| 20 Wh = 72,000 J | 20 J = 0.005555556 Wh |
| 50 Wh = 180,000 J | 50 J = 0.01388889 Wh |
| 100 Wh = 360,000 J | 100 J = 0.02777778 Wh |
| 250 Wh = 900,000 J | 250 J = 0.06944444 Wh |
| 500 Wh = 1,800,000 J | 500 J = 0.1388889 Wh |
| 1000 Wh = 3,600,000 J | 1000 J = 0.2777778 Wh |
About watt-hour and joule
Watt-hour: A watt-hour is the energy of one watt sustained for one hour — exactly 3,600 joules. Commonly used to rate battery capacity.
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 watt-hour?
- 1 watt-hour = 3,600 joule (J).
- How do I convert watt-hour to joule?
- Multiply the number of watt-hour by 3,600. For example, 10 watt-hour = 10 × 3,600 = 36,000 joule.
- How many watt-hour are in 1 joule?
- 1 joule = 0.0002777778 watt-hour.
- Which is bigger, watt-hour or joule?
- 1 watt-hour equals 3,600 joule, so a watt-hour is the larger unit.