How Much Power is my Computer Drawing

How Much Power does my PC Use?

The best way to find out your PC's power usage is by measuring directly from the wall with a power meter like the Kill-A-Watt P3 P4400. Simply plug the meter into the wall outlet, and your machine into the meter, and the P3 P4400 will provide an accurate reading of your machine's power draw.

How do I Know that the PSU is the Right Size?

Every PC case has a space for the power supply unit although the space may vary in size and shape. For example, small form factor cases will not be able to accommodate a PSU meant for a mid or full tower case. It is always best to look at the dimensions of your PC case and make sure that you are buying a power supply unit that can fit in the designated space.

Where can I Get News about Power Supplies?

is a great place to get information about the latest and greatest in tech. You can check out articles like or

How can I Calculate my PC Power Consumption?

The average electricity cost in the US is 13 cents per kWh; this means that it costs 13 cents to run something that consumes 1000 watts for one hour. To calculate the cost of running your PC at full load for one hour, you need to divide the watt usage by 1000 and multiply the result by your kWh.

How do I Calculate my PSU Requirements?

The best power supply for your PC build is the one that provides the right amount of wattage to all components simultaneously. Manually calculating this requires that you multiply the total amps of all components by the total volts of all components. The result is the total watts that your PC build requires. If you input all the components of your PC build into our calculator, it will do this for you and provide a list of options.

How To Check How Much Power a Windows PC or Mac is Using

Navigate to “Settings” and click on “My Power Tab.” You'll see a rough estimate of how much power your PC uses.