How many joules are in one watt-hour?
One watt-hour equals exactly 3600 joules.
Convert Watt-hour (Wh) to Joule (J) instantly.
Calculation
value × 3600
| Quick Conversion | Converted |
|---|---|
| 1 Wh | 3,600 J |
| 5 Wh | 18,000 J |
| 10 Wh | 36,000 J |
| 100 Wh | 360,000 J |
| 1,000 Wh | 3,600,000 J |
A watt-hour is the energy delivered by one watt of power over one hour.
Watt-hours became common as electrical systems needed a practical way to describe energy over time.
Wh is used for batteries, electronics, chargers, portable power stations, solar systems, and small-scale electricity use.
A joule is the SI unit of energy, work, and heat.
The joule is named after James Prescott Joule and became the standard SI unit for energy transfer.
Joules are used in physics, engineering, electricity, mechanics, heat transfer, chemistry, and scientific reporting.
Mathematically, joule (J) = watt-hour (Wh) converted with the formula below.
1 Wh = 3,600 J
1 J = 0.000278 Wh
Formula: value × 3600
Example: 15 Wh = 54,000 J
Precision note: Use 1 Wh = 3600 J exactly. Practical battery output may differ from the label because of voltage range, conversion losses, and device behavior.
1 Wh = 3,600 J
1 J = 0.000278 Wh
| Watt-hour [Wh] | Joule [J] |
|---|---|
| 0.01 Wh | 36 J |
| 0.1 Wh | 360 J |
| 1 Wh | 3,600 J |
| 2 Wh | 7,200 J |
| 5 Wh | 18,000 J |
| 10 Wh | 36,000 J |
| 20 Wh | 72,000 J |
| 50 Wh | 180,000 J |
| 100 Wh | 360,000 J |
One watt-hour equals exactly 3600 joules.
A watt is one joule per second, and one hour has 3600 seconds.
2.5 Wh equals 9000 J.