Kilowatt Hour to Watt Hour Converter

A kilowatt-hour (kWh) is a unit of energy equal to the energy consumed by a device with a power rating of one kilowatt operating for one hour. It equals 3.6 megajoules and is the standard unit for measuring electrical energy consumption.

The kilowatt-hour was developed with the commercialization of electricity in the late 19th century. It provided a practical way for electric utilities to measure and bill for electrical energy consumption, becoming the standard unit for electrical energy trading worldwide.

Kilowatt-hours are universally used for measuring and billing electrical energy consumption in homes, businesses, and industries. They're found on every electricity bill, used in energy efficiency ratings for appliances, and are standard in renewable energy system specifications and grid energy trading.

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.