Convert Watt-hours to Joules
Wh to J · energy conversion
What are watt-hours and joules?
A watt-hour is the energy of one watt sustained for one hour, equal to 3,600 J. The joule is the SI unit of energy, the work done by one newton acting over one meter. For reference: a food Calorie is one kilocalorie (4,184 J), and home electricity is billed in kilowatt-hours.
How to convert watt-hours to joules
1 Wh = 3,600 J. To convert, multiply the number of watt-hours by 3,600. For example, 5 Wh = 18,000 J, and 20 Wh = 72,000 J. To go the other way, multiply joules by 0.000277778 (since 1 J = 0.000277778 Wh).
Watt-hours to Joules conversion table
| Watt-hours (Wh) | Joules (J) |
|---|---|
| 1 | 3,600 |
| 10 | 36,000 |
| 100 | 360,000 |
| 500 | 1,800,000 |
| 1,000 | 3,600,000 |
| 2,000 | 7,200,000 |
| 5,000 | 18,000,000 |
FAQ
What is 1 Wh in J?
1 Wh = 3,600 J. To convert any amount, multiply the number of watt-hours by 3,600.
How do I convert joules back to watt-hours?
Go the other way: 1 J = 0.000277778 Wh, so multiply joules by 0.000277778 to get watt-hours.
Is a watt-hour bigger than a joule?
Yes — 1 Wh is the larger unit, equal to 3,600 J.
Are these energy conversions exact?
They use the standard internationally-defined conversion factors. Results are rounded to six significant figures for readability, which is accurate enough for everyday and most technical use.