Convert Joule (J) to Watt-hour (Wh)
Category: Energy
1 j = 0.000278 wh
High-precision rounding: 6 decimals
How to convert joule (j) to watt-hour (wh)
Energy is the capacity to do work. Joules form the SI base; Wh/kWh align with metering and batteries; calories and BTU survive in nutrition and HVAC. Conversions bridge mechanical, thermal, and electrical perspectives.
This converter calculates Joule (J) to Watt-hour (Wh) values by using the correct conversion rule for the Energy category. For linear units, standardized factors are used. For temperature, the calculator applies the proper formula with offsets.
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Quick conversion table
Handy values for Joule (J) to Watt-hour (Wh). Click a value to open that exact result.
Conversion formula
Linear unit conversions use standardized factors; many are exact by definition (e.g., 1 in = 25.4 mm, 1 ft = 0.3048 m).
Common mistakes
- Confusing calorie (cal) with kilocalorie (kcal) on nutrition labels.
- Treating BTU definitions interchangeably without noting standard (IT vs other).
Unit facts
- Joule (J): Joule (J) is the SI unit of energy: 1 J = 1 N·m = 1 kg·m²/s².
- Watt-hour (Wh): Watt-hour (Wh) is energy used by 1 watt for 1 hour (3,600 J); used for batteries.
About Joule (J)
Joule (J)
SI energy unit equal to N·m. Fundamental in physics, electronics (J = W·s), and thermodynamics.
History: Named after James P. Joule. Became universal with SI coherence across mechanical and electrical domains.
About Watt-hour (Wh)
Watt-hour (Wh)
Energy consumed by 1 W for 1 hour. Ubiquitous in batteries and electricity meters; 1 Wh = 3600 J.
History: Adopted in power systems because it mirrors billing intervals and storage capacities.