Joules to Watt-hours Converter

To convert a measurement in joules to watt-hours, multiply the value by 0.000277777778. The conversion factor comes from the relationship between both units and the joule.

For example, to convert 5 J to watt-hours: 5 × 0.000277777778 = 0.001388888889 Wh.

A joule is the SI derived unit of energy, equal to the work done when a force of one newton moves an object one meter (1 N·m). Named after the English physicist James Prescott Joule, who established the mechanical equivalent of heat in the 1840s. The joule became the SI standard for all forms of energy, work, and heat.

Common uses of joules include: Scientific and engineering energy calculations; Nutrition labeling in metric countries; Mechanical work and kinetic energy; Electrical energy in physics (watt-seconds).

A watt-hour is the energy delivered by one watt of power over one hour, equal to 3,600 joules. The watt-hour emerged with the electrical industry as a practical measure of energy use over time. It underpins the kilowatt-hour that appears on electricity bills worldwide.

Common uses of watt-hours include: Battery capacity ratings; Small electronics energy use; Solar panel and storage sizing; Portable power station specifications.

Here are some common values converted:

1 J = 0.000277777778 Wh 5 J = 0.001388888889 Wh 10 J = 0.002777777778 Wh 50 J = 0.013888888889 Wh 100 J = 0.027777777778 Wh