Convert Joule to Watt-hour
1 joule = 0.0002777778 watt-hour (Wh). For example, 10 joule = 0.002777778 watt-hour and 100 joule = 0.02777778 watt-hour. Type any value below to convert joule to watt-hour both ways — it runs entirely in your browser.
Joule to Watt-hour conversion formula
To convert joule to watt-hour, multiply by 0.0002777778:
watt-hour = joule × 0.0002777778
Going the other way, 1 watt-hour = 3,600 joule, so
joule = watt-hour × 3,600.
Joule to Watt-hour — worked examples
| Joule | Watt-hour |
|---|---|
| 1 J | 0.0002777778 Wh |
| 2 J | 0.0005555556 Wh |
| 3 J | 0.0008333333 Wh |
| 5 J | 0.001388889 Wh |
| 10 J | 0.002777778 Wh |
| 25 J | 0.006944444 Wh |
| 50 J | 0.01388889 Wh |
| 100 J | 0.02777778 Wh |
Joule ↔ Watt-hour reference table
| Joule → Watt-hour | Watt-hour → Joule |
|---|---|
| 1 J = 0.0002777778 Wh | 1 Wh = 3,600 J |
| 2 J = 0.0005555556 Wh | 2 Wh = 7,200 J |
| 5 J = 0.001388889 Wh | 5 Wh = 18,000 J |
| 10 J = 0.002777778 Wh | 10 Wh = 36,000 J |
| 20 J = 0.005555556 Wh | 20 Wh = 72,000 J |
| 50 J = 0.01388889 Wh | 50 Wh = 180,000 J |
| 100 J = 0.02777778 Wh | 100 Wh = 360,000 J |
| 250 J = 0.06944444 Wh | 250 Wh = 900,000 J |
| 500 J = 0.1388889 Wh | 500 Wh = 1,800,000 J |
| 1000 J = 0.2777778 Wh | 1000 Wh = 3,600,000 J |
About joule and watt-hour
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.
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.
Frequently asked questions
- How many watt-hour are in 1 joule?
- 1 joule = 0.0002777778 watt-hour (Wh).
- How do I convert joule to watt-hour?
- Multiply the number of joule by 0.0002777778. For example, 10 joule = 10 × 0.0002777778 = 0.002777778 watt-hour.
- How many joule are in 1 watt-hour?
- 1 watt-hour = 3,600 joule.
- Which is bigger, joule or watt-hour?
- 1 watt-hour equals 3,600 joule, so a watt-hour is the larger unit.