Joule (J)
The joule is the SI unit of energy and connects mechanical work, heat, and electrical energy.
History: the joule is named after James Prescott Joule and is the SI unit of energy.
Quickly convert joules to watt-hours without lookup tables or manual math.
This page is focused on converting joules to watt-hours. Type a number into the first field and the result appears immediately in the second field.
Example: 1 J = 0.0002777778 Wh. Conversion formula: result = value × 1 / 3600.
Use this converter for everyday calculations, study notes, engineering checks, and quick value verification without installing a separate app.
The joule is the SI unit of energy and connects mechanical work, heat, and electrical energy.
History: the joule is named after James Prescott Joule and is the SI unit of energy.
The watt-hour measures energy consumed or produced by one watt of power over one hour.
History: the watt-hour came from electrical engineering as the energy of one watt of power over one hour.
Enter a value in the Joule field. The converter applies the formula "result = value × 1 / 3600" and immediately shows the result in watt-hours.
1 J = 0.0002777778 Wh.
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