J to Wh
Convert Joule to Watt-hour
Convert Joule to Watt-hour instantly with the tool above. The conversion factor is 0.000277777778, meaning 1 joule equals 0.000277777778 watt-hours. Type any value and the result updates immediately — no ads, no page reloads, no clutter.
Type a number above. The result updates instantly — no buttons, no reloads.
1 Joule = 0.000277777778 watt-hours
1 Watt-hour = 3,600 joules
Quick reference
Common joules converted to watt-hours at a glance.
| J | Wh |
|---|---|
| 1 | 0.000277777778 |
| 2 | 0.000555555556 |
| 5 | 0.00138889 |
| 10 | 0.00277778 |
| 25 | 0.00694444 |
| 50 | 0.01388889 |
| 100 | 0.02777778 |
| 500 | 0.13888889 |
| 1,000 | 0.27777778 |
How to convert joules to watt-hours
To convert a value from joules to watt-hours, multiply the joule value by 0.000277777778 watt-hours. For example, 10 joules × that factor = 0.00277778 watt-hours.
This joule to watt-hour converter runs entirely in your browser, so results appear instantly with no page reload, no advertisements and no sign-up.
Frequently asked questions
How many watt-hours are in 1 joule?+
1 joule is equal to 0.000277777778 watt-hours.
How do you convert joules to watt-hours?+
To convert joules to watt-hours, multiply the joule value by 0.000277777778. For example, 10 joules × 0.000277777778 = 0.00277778 watt-hours.
What is the formula to convert joules to watt-hours?+
Joule → Watt-hour: value × 0.000277777778. Equivalently, 1 joule = 0.000277777778 watt-hours.
Is this Joule to Watt-hour converter free to use?+
Yes. This joule to watt-hour converter is completely free, works instantly in your browser, and contains no advertisements, popups or sign-up.