Watt Hour to Kilojoule Converter

A watt-hour (Wh) is a unit of energy equal to the energy consumed by a device with a power rating of one watt operating for one hour. It equals 3,600 joules and is commonly used for measuring energy in small electronic devices.

The watt-hour developed alongside electrical technology as a convenient way to measure energy consumption in smaller electrical devices. It became particularly important with the rise of portable electronics and battery-powered devices where kilowatt-hours would be impractically large.

Watt-hours are commonly used for measuring battery capacity in portable electronics, energy consumption of small appliances, and in renewable energy systems for small-scale applications. They're standard for smartphone batteries, laptop batteries, and small solar power systems.

A kilojoule (kJ) is a unit of energy equal to one thousand joules (10³ J). It's commonly used for measuring food energy content, small-scale mechanical work, and energy in chemical reactions.

The kilojoule became widely adopted in nutrition and food science as many countries moved away from calories to metric energy units. It was officially adopted for food labeling in many countries as part of metrication efforts, providing a more scientifically consistent energy measurement.

Kilojoules are extensively used in food and nutrition labeling, exercise and fitness calculations, chemical reaction energy measurements, and small-scale engineering applications. They're mandatory on food labels in many countries and are standard in sports science and metabolism studies.