Watt-hours to Joules Converter
Convert watt-hour to joule instantly. Type a value below — the result updates as you type.
When you need to convert watt-hour to joule
Energy conversions appear on nutrition labels, utility bills and appliance specs, letting you compare food energy, electricity use and heating output on a common scale.
Typical values: 0.5 Wh is about 1800 J, and 5 Wh works out to roughly 18000 J. Because the ratio is fixed at 3600, you can scale any amount linearly — doubling the watt-hours doubles the joules.
Food packaging, power meters and heating equipment each prefer different energy units, so converting makes them directly comparable.
How to convert watt-hour to joule
One watt-hour equals 3600 joules. To convert, multiply the number of watt-hours by 3600:
joules = watt-hours × 3600
For example, 10 watt-hours × 3600 = 36000 joules.
Watt-hours to joules conversion table
| Energy (Wh) | Joules (J) |
|---|---|
| 1 Wh | 3600 J |
| 2 Wh | 7200 J |
| 3 Wh | 10800 J |
| 5 Wh | 18000 J |
| 10 Wh | 36000 J |
| 20 Wh | 72000 J |
| 50 Wh | 180000 J |
| 100 Wh | 360000 J |
FAQ
How many joules are in a watt-hour?
One watt-hour = 3600 joules.
How do I convert joules back to watt-hours?
Divide by 3600, or use the joules to watt-hours converter.