Computer Electricity Cost Calculator
See roughly what a computer costs to run each month. Enter your own electricity price, since it changes from place to place and from month to month.
- Free
- Works offline after your first visit
- Saves on this device
- No sign-up
- Updated
How it works
Power in watts times hours used gives energy in watt-hours. Divide by 1000 for kilowatt-hours, which is the unit your bill uses. Multiply by 30 days for a month.
Multiply the kilowatt-hours by your price per kilowatt-hour to get the cost. Your bill shows that price.
Worked example
A computer drawing 150 W for 6 hours a day uses about 27 kWh a month, which comes to $4.32 at your rate.
Questions
Where do I find my price per kWh?
Your electricity bill lists it, often with a separate line for delivery charges. Use the total per kWh if you can.
How many watts is my computer?
Look at the power supply label or use a plug-in power meter. Real use is usually below the maximum rating.
Does sleep mode help?
It does, because a computer on sleep draws far less power than one that is on. Include only the hours it is fully on.
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