Cost to run an appliance
Enter the power, usage, and your rate.
How electricity cost is calculated
Start with the appliance's power in watts and divide by 1,000 to get kilowatts. Multiply kilowatts by the hours used to get kilowatt-hours (kWh), the unit your electricity provider bills you for. Multiply the kWh by your rate per kWh to get the cost. For example, a 1,500 watt space heater run for one hour uses 1.5 kWh, which at 0.30 per kWh costs about 0.45 per hour.
Frequently asked questions
How do I calculate the cost to run an appliance?
Divide the wattage by 1000 to get kilowatts, multiply by hours used for kilowatt-hours, then multiply by your rate per kWh. A 1500 watt heater for 1 hour at 0.30 per kWh costs about 0.45.
What is a kilowatt-hour?
A kilowatt-hour (kWh) is the energy used to run one kilowatt of power for one hour. Providers bill per kWh, so it turns power into cost.
Where do I find an appliance's wattage?
Check the label on the device, the owner's manual, or the specs. If only amps and volts are shown, multiply them to get watts.
What is the average electricity rate?
Rates vary by location and provider, commonly around 0.15 to 0.35 per kWh in the US. Use the exact rate on your latest bill for accuracy.
Is my data saved anywhere?
No. All calculations run entirely in your browser. Nothing you enter is uploaded or stored on a server.
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Disclaimer: Results are estimates for general informational purposes only. Actual costs depend on your exact tariff, taxes, and usage patterns.