Joule to Watt-hour Converter
Convert joules to watt-hours with this free energy converter. The exact relationship used on this page is 1 joule = 0.000277777777778 watt-hours. Type any number — the result updates instantly, works on phones and desktops, and is ready to copy into homework, a spec sheet, or a shopping list.
Formula: Watt-hour = Joule × 0.000277777777778
How to convert joules to watt-hours
- Enter the value in joules in the converter.
- Read the equivalent amount in watt-hours.
- Use the swap link if you need watt-hour to joule instead.
- Check the table for common values without typing.
Worked examples
- 1 J = 0.0002777777778 Wh
- 5 J = 0.001388888889 Wh
- 10 J = 0.002777777778 Wh
- 25 J = 0.006944444444 Wh
Conversion table
Common joules values converted to watt-hours.
| J | Wh |
|---|---|
| 1 | 0.0002777777778 |
| 2 | 0.0005555555556 |
| 3 | 0.0008333333333 |
| 4 | 0.001111111111 |
| 5 | 0.001388888889 |
| 6 | 0.001666666667 |
| 7 | 0.001944444444 |
| 8 | 0.002222222222 |
| 9 | 0.0025 |
| 10 | 0.002777777778 |
| 20 | 0.005555555556 |
| 50 | 0.01388888889 |
| 100 | 0.02777777778 |
| 250 | 0.06944444444 |
| 500 | 0.1388888889 |
| 1,000 | 0.2777777778 |
About this conversion
Joule (J) and Watt-hour (Wh) are both energy units. Energy converters connect food labels (kcal), electricity bills (kWh), physics (joules), and heating (BTU). Bookmark this URL when you convert joules to watt-hours often, then explore related pairs in the same category if you need a different target unit.
Need the other direction? Open the watt-hour to joule converter.
FAQ
How many watt-hours are in 1 joule?+
1 joule equals 0.000277777777778 watt-hours.
What is the formula to convert joules to watt-hours?+
Watt-hour = Joule × 0.000277777777778
How do I convert joules to watt-hours by hand?+
Multiply the joule value by 0.000277777777778. Example: 10 joules × 0.000277777777778 = 0.00277777777778 watt-hours.
Is this J to Wh converter accurate?+
Yes. Linear conversions use internationally agreed factors relative to SI. Temperature and inverse fuel units use the standard offset or reciprocal formulas, not a guessed scale factor.