Electricity Cost Calculator
What an appliance costs to run
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About this calculator
Look up the wattage on the appliance label, enter how many hours a day you use it and your tariff per kilowatt-hour to see what it adds to your bill.
The formula
Cost = watts ÷ 1000 × hours × price per kWh
Worked exampleA 150 W fridge running 24 h at 0.20 per kWh → 0.72 per day, 21.60 per month.
Frequently asked questions
Where do I find wattage?
On the label or in the manual. If only amps and volts are shown, multiply them.
What is a kWh?
One kilowatt of power used for one hour, the unit on your electricity bill.
Do appliances use power on standby?
Yes. Standby draws a small amount, often 1–5 W.
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