Watt-hours to joules (Wh to J)
Convert watt-hours to joules. For energy, 1 Wh equals 3600 J.
Converter
Wh to J conversion table
| Watt-hours | Joules |
|---|---|
| 1 Wh | 3600 J |
| 2 Wh | 7200 J |
| 5 Wh | 18000 J |
| 10 Wh | 36000 J |
| 25 Wh | 90000 J |
| 50 Wh | 180000 J |
| 100 Wh | 360000 J |
| 1000 Wh | 3600000 J |
Formula
J = Wh × 3600
Worked example
25 Wh × 3600 = 90000 J
Popular conversion examples
Choose an example to open this converter with the value filled in. These are useful examples, not a claim about search rankings.
- 1 Wh to J = 3600 J
- 5 Wh to J = 18000 J
- 100 Wh to J = 360000 J
- 310 Wh to J = 1116000 J
- 1 J to Wh = 0.000277778 Wh
- 87500 J to Wh = 24.3056 Wh
About watt-hours and joules
Watt-hour (Wh)
A watt-hour is the energy used by 1 watt over one hour: exactly 3,600 joules. It is used for battery capacity and small appliances.
Joule (J)
The joule is the SI unit of energy and work: one newton-meter. It is used in physics, engineering and electrical energy ratings.
Both are units of energy; the base unit used internally is J.
Notes
- Calorie = thermochemical calorie (4.184 J); kilocalorie = 1000 cal (the food “Calorie”).
- BTU = International Table BTU (1055.05585262 J). Other BTU definitions (thermochemical, 39 °F, etc.) differ slightly and are not included.
- Energy is not power: a kilowatt-hour is an amount of energy, a kilowatt is a rate.
Wh to J FAQs
How do I convert watt-hours to joules?
Multiply the number of watt-hours by 3600 to get joules. For example, 25 Wh × 3600 = 90000 J.
How many joules are in one watt-hour?
1 Wh = 3600 J and 1 J = 0.0002777777778 Wh. To go the other way, use the joules to watt-hours converter.
How many joules are in 5.625 watt-hours?
5.625 Wh = 20250 J, rounded to 6 significant digits. Change the value in the converter above for any other amount.
How many joules are in 165 watt-hours?
165 Wh = 594000 J, rounded to 6 significant digits.
Is the Wh to J conversion exact?
Yes. The factor 3600 follows directly from the unit definitions (A watt-hour is the energy used by 1 watt over one hour: exactly 3,600 joules; the joule is the SI unit of energy and work: one newton-meter), so the only rounding is in the digits you choose to display.
What is the difference between watt-hours and joules?
A watt-hour is the energy used by 1 watt over one hour: exactly 3,600 joules. It is used for battery capacity and small appliances. The joule is the SI unit of energy and work: one newton-meter. It is used in physics, engineering and electrical energy ratings.
Is a kilowatt-hour the same as a kilowatt?
No. A kilowatt (kW) is a rate of using energy, while a kilowatt-hour (kWh) is an amount of energy. A 2 kW heater running for 3 hours uses 6 kWh, which is 21600 kJ.
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