joules to watt-hours Converter
Convert joules to watt-hours instantly: 1 joules = 0.000277778 watt-hours. Free converter with the formula, a reference table and FAQs — no sign-up.
| joules | watt-hours |
|---|
How to convert joules to watt-hours
Enter your value
Type the number of joules you want to convert into the left box. The result in watt-hours appears instantly in the right box. You can also type into the right box to convert in the other direction.
Use the swap button
Click the ⇄ Swap button to reverse the conversion — watt-hours to joules. Your current value carries across so you don't have to re-enter anything.
About joules and watt-hours
joules and watt-hours are common energy measurements.
Worked examples: joules to watt-hours
Multiply the joules value by 0.000277778 to get watt-hours. A few quick examples:
- 5 joules × 0.000277778 = 0.00138889 watt-hours
- 25 joules × 0.000277778 = 0.00694445 watt-hours
- 250 joules × 0.000277778 = 0.0694445 watt-hours
Related conversions
3,600 J = 1 Wh. A single chocolate biscuit (100 kcal = 418,400 J = 116 Wh) contains more energy than a fully-charged phone battery (4,500 mAh at 3.7V = 16.65 Wh). Calories to watt-hours: kcal × 1.163.
| joules | watt-hours |
|---|---|
| 1 | 0.0002778 |
| 3600 | 1 |
| 10000 | 2.778 |
| 100000 | 27.78 |
| 1000000 | 277.8 |
| 10000000 | 2778 |
Frequently asked questions
How do I convert joules to watt-hours?
To convert joules to watt-hours, multiply by 0.000277778. Or use the calculator above for instant results.
How many watt-hours are in 1 joules?
1 joules equals 0.000277778 watt-hours.
Is the joules to watt-hours converter free?
Yes, the joules to watt-hours converter is completely free with no sign-up required, no downloads, and it works offline once the page has loaded.