Convert joules to watt hours
1 J = 0.00027778 Wh. Change the amount below, or read the formula and the reference table further down.
1 joule equals
watt hours
1 J = 0.00027778 Wh
The formula
Joules and watt hours both measure energy from the same zero, so a single multiplier does the job.
Wh = J × 0.0002777778
Going the other way? Convert watt hours to joules.
Joules to watt hours table
Common values, rounded for reading.
| Joules (J) | Watt hours (Wh) |
|---|---|
| 1 | 0.000278 |
| 2 | 0.000556 |
| 3 | 0.000833 |
| 4 | 0.001111 |
| 5 | 0.001389 |
| 6 | 0.001667 |
| 7 | 0.001944 |
| 8 | 0.002222 |
| 9 | 0.0025 |
| 10 | 0.002778 |
| 15 | 0.004167 |
| 20 | 0.005556 |
| 25 | 0.006944 |
| 30 | 0.008333 |
| 40 | 0.011111 |
| 50 | 0.013889 |
| 75 | 0.020833 |
| 100 | 0.027778 |
| 250 | 0.069444 |
| 500 | 0.138889 |
| 1,000 | 0.277778 |
Questions people ask
- How many watt hours are in a joule?
- One joule equals 0.0002777778 watt hours.
- How do I convert joules to watt hours by hand?
- Multiply the number of joules by 0.0002777778. For a rough check, 0 is close enough for most everyday use.
- What is 1 joule in watt hours?
- 1 joule is 0.00027778 watt hours.
Calcuit generates this page from a unit table, so the factors here match every other page on the site.