The reason that kilowatts-hours are typically used as a measurement of energy rather than watt-hours is simply because of scale: the amount of energy a typical household in the United States uses in a year is on the order of millions of watts, so it is easier to discuss in terms of kilowatt-hours instead.īritish thermal units (BTU) are a measurement of heat used as part of the Imperial and US customary units of measurement. Energy (E) and power (P) are related to each other through time (t):Įlectricity is most often measured and paid for based on the number of kilowatt-hours used. Generally, when discussing the cost of electricity, we talk in terms of energy. One kilowatt-hour is equal to the energy used to maintain one kilowatt of power for one hour. Kilowatt-hours (kWh) are a unit of energy. Both watts and kilowatts are SI units of power and are the most common units of power used. One kilowatt (kW) is equal to 1,000 watts. Watts (W) is a unit of power used to quantify the rate of energy transfer. Other common units of power include kilowatts (kW), British thermal units (BTU), horsepower (hp), and tons. One of the most common units of electrical power for appliances is the watt (W). The amount of time and power that each appliance is used varies significantly between households, so for the best results, adjust the usage for each appliance to most accurately reflect your personal usage. Use the calculator below to estimate electricity usage and cost based on the power requirements and usage of appliances. Home / other / electricity calculator Electricity Calculator
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