Energy Calculator

By: U.S. Department of Energy — Energy Efficiency and Renewable Energy

If you’re trying to decide whether to invest in a more energy-efficient appliance or you’d like to determine your electricity loads, you may want to estimate appliance energy consumption.

You can use this formula to estimate an appliance’s energy use:
Wattage X Hours used per day X Days used per year ÷ 1000 = Kilowatt-hour (KWH) consumption per year.

For example:
Personal computer (120 Watts) and monitor (150 Watts): (120 Watts + 150 Watts) X 4 hours per day X 365 days per year ÷ 1000 = 394 KWH/year

Then, calculate the annual cost to run an appliance by multiplying the KWH per year by your Coop’s rate per KWH consumed. 394 KWH X $0.104 (current national average) = $40.98 per year

You usually can find the wattage of most appliances stamped on the bottom or back of the appliance, or on its nameplate. The wattage listed is the maximum power drawn by the appliance. Since many appliances have a range of settings (hairdryers), the actual amount of power consumed depends on the setting used at any one time.

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Source: U.S. Department of Energy — Energy Efficiency and Renewable Energy