GlenCalc

Electricity cost calculator

Find the wattage on the appliance’s label, estimate the hours it runs, and enter the rate from your electric bill (in dollars per kWh).

Per kWh, from your bill.

Your answer

Cost per month$31.05
Cost per year$372.56
Cost per day$1.02
Energy per day6 kWh
Cost per hour of use$0.26

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How we worked it out

Updated as you change the numbers.

  1. kWh per day = watts × hours ÷ 1,000. Cost = kWh × rate.

Method and assumptions

A kilowatt-hour is 1,000 watts for one hour. Appliances with thermostats or motors (fridges, heaters, AC) don’t draw full power all the time, so their real use is lower than watts × hours; a plug-in energy meter gives the true figure.

Questions

How much does a 1,500 W heater cost to run 4 hours a day at 17¢?

About $1.02 a day, $31 a month.

Sources

Method and figures checked on . Every worked answer on this page is covered by an automated test. Found a mistake? Tell us.

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