Electricity Cost Calculator
Estimate how much an appliance costs to run, based on its power and your tariff.
Result
Energy used (kWh)
150.00
Total cost
22.50
How it works
This calculator estimates what an appliance costs to run. It multiplies the device's power in kilowatts by the hours it runs and the number of days, giving the energy in kilowatt-hours (kWh), then multiplies that by your electricity price per kWh. Appliance power is usually printed on a label or in the manual, in watts (W); divide by 1000 to get kilowatts (1500 W = 1.5 kW). Your price per kWh is on your electricity bill. A 2 kW heater running 5 hours a day for 30 days uses 300 kWh — at a price of 0.20 per kWh that is 60 in energy. Running the numbers this way quickly shows which appliances quietly dominate your bill.
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Frequently asked questions
How do I find an appliance's wattage?
Check the rating label on the device or its manual. It is shown in watts (W); divide by 1000 for kilowatts.
What is a kilowatt-hour (kWh)?
It is the energy used by a 1 kW device running for one hour. Electricity bills are charged per kWh.
Do appliances cost anything on standby?
Yes. Devices left in standby still draw a few watts around the clock, which adds up over a month — the "phantom load".
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