Convert joule to watt-hour
Enter the value to convert from joule to watt-hour.
How to Convert Joule to Watt-hour
Converting joule to watt-hour is straightforward using our conversion calculator.
Conversion Formula
Wh = J ÷ 3600Reverse conversion: Convert watt-hour to joule
Comparison: Joule vs Watt-hour
When to Use Each Unit
Joule: Universal scientific unit for all forms of energy: mechanical, electrical, thermal, chemical, and nuclear energy worldwide.
Watt-hour: Used for small device energy consumption, battery ratings, and low-power electrical measurements.
Common Conversion Values
- 1000 J = 1 kJ
- 1 J ≈ 0.239 cal
- 3,600,000 J = 1 kWh
- 1 J ≈ 0.738 ft⋅lbf
About Joule
Definition: The joule (symbol: J) is the SI unit of energy, equal to the energy expended when applying one newton of force through one meter of distance.
History: Named after English physicist James Prescott Joule in 1889. Established the mechanical equivalent of heat and energy conservation.
Current Use: Universal scientific unit for all forms of energy: mechanical, electrical, thermal, chemical, and nuclear energy worldwide.
Examples: Apple: 350,000 J, car battery: 4.3 MJ, lightning bolt: 1-5 billion J, human daily intake: 8-10 MJ
About Watt
Definition: The watt hour (symbol: Wh) is the energy consumed by using one watt of power for one hour.
History: Smaller electrical energy unit for measuring low-power device consumption and battery capacity.
Current Use: Used for small device energy consumption, battery ratings, and low-power electrical measurements.
Examples: Smartphone battery: 15 Wh, laptop battery: 50-100 Wh, tablet: 25-40 Wh, LED bulb hour: 10 Wh