Appliance Electricity Cost Calculator
Find what an appliance costs to run each month. Enter its power rating in watts, how many hours it runs a day, and what you pay per kilowatt-hour.
- Free
- Works offline after your first visit
- Saves on this device
- No sign-up
- Updated
How it works
Multiply watts by hours and by days, then divide by 1,000 to get kilowatt-hours, the unit your power bill uses.
Multiply the kilowatt-hours by your price per kilowatt-hour to get the cost. The power rating is on the label on the appliance or in its manual.
Worked example
A 75 watt appliance running 8 hours a day for 30 days uses 18 kWh, which costs $2.88 at your rate.
Questions
Where do I find the watts?
Check the label on the back or bottom of the appliance, or the manual. If only volts and amps are listed, multiply them to get watts.
Where is my price per kilowatt-hour?
It is on your power bill, often shown as the energy rate. Use the rate per kilowatt-hour, not the total with fees, to keep the estimate simple.
Does this count standby power?
Only if you enter it as hours. Devices on standby add a little each month, and you can add their hours as a separate run.
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