Electricity Cost Calculator
Find out what any appliance really costs to run. Enter its power, how long you use it, and your electricity rate to see the daily, monthly, and yearly cost.
Guide
How it works
Your electricity bill is measured in kilowatt-hours (kWh). One kilowatt-hour is the energy a 1,000-watt appliance uses in one hour. This calculator turns an appliance label into a real running cost so you can see which devices quietly drive your bill.
How it works: Energy used per day (kWh) = power in kilowatts multiplied by hours used per day, scaled by how many days a week you use it. Cost = energy used multiplied by your price per kWh. We then extend the daily figure to a month and a year.
You can find an appliance's wattage on its rating label, the power supply, or the manual. If only amps and volts are listed, multiply them to get watts (watts = volts times amps).
Where do I find my electricity rate per kWh?expand_more
Your rate is on your electricity bill, usually shown as a price per kWh or per unit. If you have a tiered or time-of-use plan, use your average rate for a rough figure, or your peak rate for a worst-case estimate.
How do I convert watts to kilowatts?expand_more
Divide watts by 1,000. A 1,500-watt heater is 1.5 kW. This calculator does the conversion automatically when you pick the watts or kilowatts unit.
Does standby power count?expand_more
Yes. Many devices draw a few watts even when off or idle. Over a full year that standby draw adds up, so if you want the complete picture, run a separate calculation using the standby wattage and 24 hours a day.
Why is my bill higher than the total of my appliances?expand_more
Bills also include fixed daily standing charges, taxes, and appliances you may have overlooked. This tool estimates the running cost of a single device, which is ideal for comparing appliances or deciding whether an upgrade pays off.
Next steps