Work out what an appliance costs to run per day, month and year.
Calculated locally in your browser.
How is electricity cost calculated?
Energy (kWh) = watts ÷ 1000 × hours, and cost = energy × price per kWh (found on your electricity bill). For example, a 1,500 W heater used 3 hours a day at 0.17 per kWh costs about 0.77 per day and 23 per month. Running longer or at higher wattage costs more.
Understanding your result
Watts measure power; kilowatt-hours measure energy used over time. Running longer or at higher wattage costs more.
Formula and method
Energy (kWh) = watts ÷ 1000 × hours. Cost = energy × price per kWh. Find your price per kWh on your electricity bill.
Worked example
A 1,500 W heater used 3 hours a day at 0.17 per kWh costs about 0.77 per day and 23 per month.
How to use this tool
- Enter the appliance power in watts.
- Enter the hours used per day and your price per kWh.
- Press Calculate.
About the Electricity Cost Calculator
The Electricity Cost Calculator estimates how much an appliance costs to run, turning its wattage and usage into a daily, monthly and yearly bill.
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Frequently asked questions
Where do I find my price per kWh?
It’s listed on your electricity bill as the unit rate or price per kWh. Enter that figure for an accurate estimate.