Electricity cost calculator
Estimate the cost of running a device using its power, daily use, and your electricity unit price.
Quick examples
What the result includes
The estimate covers a device’s electricity use at the unit price you enter. A month uses 30 days; a year uses 365 days. Fixed charges and other bill components are separate.
How it is calculated
A constant 100 W for 5 hours uses 0.5 kWh a day. At the default $0.18 per kWh (EIA, August 2026), that is $0.09 a day, $2.70 over 30 days or $32.85 a year.
Questions about this estimate
What if a device switches on and off?
Use average power over a representative period or measured consumption where available. A maximum nameplate rating may not reflect normal use.
Are the example inputs recommendations?
No. They are simple sample values to demonstrate the calculation. Enter values appropriate to your own device and unit price.
Where does the default price come from?
The default is the U.S. average residential electricity price for August 2026 from the EIA Electric Power Monthly, rounded to $0.01 per kWh. Your own price is on your bill and may be higher or lower.
Sources
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