1 watt-hour (Wh) = 3,600 joules (J). To convert, multiply by 3,600: J = Wh × 3,600. For example, 5 Wh = 18,000 J.
J = Wh × 3,600
Watt-hours to joules table
| Watt-hours (Wh) | Joules (J) |
|---|---|
| 1 | 3,600 |
| 2 | 7,200 |
| 3 | 10,800 |
| 4 | 14,400 |
| 5 | 18,000 |
| 10 | 36,000 |
| 20 | 72,000 |
| 25 | 90,000 |
| 50 | 180,000 |
| 100 | 360,000 |
| 250 | 900,000 |
| 500 | 1,800,000 |
| 1,000 | 3,600,000 |
The two units
Watt-hour (Wh). One watt for one hour: 3,600 joules. Battery capacities are given in Wh.
Joule (J). The SI unit of energy: one newton acting over one meter.
Because both units are defined in terms of the same base unit, the factor 3,600 is exact, not a rounded measurement.
Convert watt-hours to other units
- Watt-hours to kilojoules — 1 Wh = 3.6 kJ
- Watt-hours to calories — 1 Wh = 860.4206501 cal
- Watt-hours to kilocalories — 1 Wh = 0.8604206501 kcal
- Watt-hours to kilowatt-hours — 1 Wh = 0.001 kWh
- Watt-hours to British thermal units — 1 Wh = 3.412141633 BTU
- Watt-hours to electronvolts — 1 Wh = 2.246943e+22 eV
Convert other units to joules
Questions people ask
- How many joules are in a watt-hour?
- 3,600, exactly.
- How do you convert watt-hours to joules?
- J = Wh × 3,600. It is the same as dividing by 0.0002777778.
- How do you convert joules back to watt-hours?
- Wh = J ÷ 3,600. See joules to watt-hours.
Results use the legal definitions of each unit and are checked against the Pint unit library. Display rounds to 10 significant digits. All unit conversions · More tools
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