Kilojoules to Watt-hours Converter

To convert a measurement in kilojoules to watt-hours, multiply the value by 0.277777777778. The conversion factor comes from the relationship between both units and the joule.

For example, to convert 5 kJ to watt-hours: 5 × 0.277777777778 = 1.388889 Wh.

A kilojoule equals 1,000 joules and is the standard metric unit for expressing food energy on nutrition labels in most of the world. As metric countries adopted SI units for food labeling, the kilojoule replaced the food calorie on packaging in regions such as Australia, New Zealand, and the European Union (shown alongside kcal).

Common uses of kilojoules include: Food energy on nutrition labels; Dietary and exercise energy tracking; Chemical reaction energy (enthalpy); Battery and mechanical energy specs.

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 kJ = 0.277777777778 Wh 5 kJ = 1.388889 Wh 10 kJ = 2.777778 Wh 50 kJ = 13.888889 Wh 100 kJ = 27.777778 Wh