Watt Hour to Therm 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 therm (thm) is a unit of energy equal to 100,000 BTUs or approximately 105.5 megajoules. It's commonly used for measuring natural gas consumption and energy content in the United States gas industry.

The therm was introduced in the early 20th century by the gas industry in the United States as a convenient unit for measuring and billing natural gas consumption. It provided a practical scale for residential and commercial gas usage where BTUs would result in large numbers.

Therms are primarily used in the United States for natural gas billing, gas appliance ratings, and energy content specifications for natural gas. They're found on residential and commercial gas bills, used in gas utility planning, and for measuring heating energy consumption.