Electricity Cost Calculator

Find what an appliance costs to run per day, month and year, or estimate your monthly electric bill.

What Do You Want to Find?
$
Price in cents per kWh (17 = $0.17).
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Cost
Per day
Per month (30.4 days)
Per year
Energy used
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How to Calculate Electricity Cost

kWh = watts × hours ÷ 1,000   Cost = kWh × price per kWh

Find the watts on the appliance label or manual. If it lists amps, watts ≈ volts × amps (120 V in most US homes).

Worked Example

Tips

Many appliances don’t draw their full rated watts all the time: refrigerators and heaters cycle on and off, so real use is often lower. Your bill’s price per kWh may include delivery charges and tiers or time-of-use rates; divide the total bill by kWh used to get your effective rate.