Electricity Cost Calculator
Pick an appliance or enter its wattage, say how long it runs, and see what it adds to the bill.
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Energy in kilowatt-hours is watts × hours ÷ 1,000. Cost is kilowatt-hours × your rate. The default of 17 cents per kWh is close to the recent US residential average; the rate on your own bill will be more accurate, and it varies a lot by state.
Finding the wattage
Look for the label on the back or underside of the appliance, or in its manual. If the label gives amps, multiply by the voltage (120 V for most US outlets, 240 V for dryers, ranges and car chargers). Appliances that cycle on and off, such as refrigerators, draw their rated power only part of the time.