Convert Watt Hour to Joule
Use this free converter to change watt hours (Wh) into joules (J). Watt hour and joule both measure energy. As a quick reference, 1 Wh equals 3600 J, and 1 J equals 0.00027777778 Wh.
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Joule (J)
3600
1 Wh = 3600 J
Energy conversion table
| Watt Hour | Joule |
|---|---|
| 0.01 | 36 |
| 0.1 | 360 |
| 0.5 | 1800 |
| 1 | 3600 |
| 2 | 7200 |
| 3 | 10800 |
| 5 | 18000 |
| 10 | 36000 |
| 20 | 72000 |
| 25 | 90000 |
| 50 | 180000 |
| 100 | 360000 |
| 1,000 | 3600000 |
How to convert Watt Hour to Joule
Multiply the watt hour value by 3600 to get joules.
- Enter the number of watt hours you want to convert.
- The converter instantly shows the equivalent value in joules.
- Worked example: 15 Wh × 3600 = 54000 J.
- Use the swap button to reverse the conversion (joule to watt hour).
About these units
Watt Hour (Wh)
- Definition
- A watt-hour (Wh) is the energy of one watt sustained for one hour, equal to 3,600 joules.
- History
- It arose with the electricity industry as a practical billing unit.
- Current use
- Watt-hours rate batteries and small energy stores.
Joule (J)
- Definition
- The joule (J) is the SI unit of energy, the work done by a force of one newton over one meter.
- History
- Named after physicist James Prescott Joule, who studied the link between heat and work.
- Current use
- Joules measure energy, work, and heat throughout science and engineering.
Frequently asked questions
How many joules are in a watt hour?
There are 3600 J in 1 Wh. To convert, multiply the number of watt hours by 3600.
How do I convert watt hours to joules?
Multiply the watt hour value by 3600 to get joules. For example, 10 Wh = 36000 J.
Is this watt hour-to-joule converter free?
Yes. This converter is completely free, runs entirely in your browser, and requires no sign-up. Your inputs never leave your device.
Convert Watt Hour to other energy units
| Unit | 1 Watt Hour equals |
|---|---|
| Joule (J) | 3600 J |
| Kilojoule (kJ) | 3.6 kJ |
| Calorie (cal) | 860.42065 cal |
| Kilocalorie (kcal) | 0.86042065 kcal |
| Kilowatt Hour (kWh) | 0.001 kWh |
| Electronvolt (eV) | 2.2469e+22 eV |
| British Thermal Unit (BTU) | 3.4121416 BTU |
| Foot-Pound (ft·lb) | 2655.2237 ft·lb |