Joule to Watt-hour
Convert J to Wh instantly — free, no sign-up.
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About the Joule (J)
The Joule is the SI unit of energy, defined as the work done by one newton of force over one meter — a single joule is roughly the energy released dropping an apple one meter.
About the Watt-hour (Wh)
The Watt-hour is the energy delivered by one watt of power sustained for one hour — commonly used to rate small battery capacities like phone power banks.
How to convert J to Wh
- Enter the value in J in the box above.
- The Wh equivalent updates instantly.
- Use the swap button to convert Wh back to J just as easily.