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PSU Calculator

If you’re working on your own PC build, knowing what power supply you need is an important step. Our PSU Calculator helps you do just that, without all the usual hassle. Just enter all your components into the calculator below and it will work out what PSU  you need for your build – simple as that.

Disclaimer: All efforts have been made to ensure the accuracy of all information provided by this calculator. WePC assumes no liability, expressed or implied, for any issues that might arise from the power supply suggested by the PSU Calculator.

Why use a Power Supply Calculator?

If you’re new to PC building, the chances are, your knowledge of components wattage is going to be fairly limited. Using a PSU calculator is going to take any of the stress that comes with choosing the right PSU away from the build process. It not only recommends the required wattage for your build, but it also offers up some of the best PSU options for each specific price point. The PSU calculator really does make your life a whole lot easier. 

How Your PSU Can Affect Gaming Performance

The most important components in a gaming PC are the CPU and GPU. But these components, just like all the others, need adequate power to operate. If your power supply can only provide 80% of the power your GPU needs, it can’t just simply run at 80% performance. Instead, the system will be unable to run at all and will likely crash.

So, if you’re working with a PSU that can’t support the rest of your build, all that hard work you put into building your gaming PC will be for nothing.

But, that’s not all. If you’re working with an unstable power supply, you run the risk of damaging your components permanently. That’s why we always recommend choosing a PSU that has a higher efficiency rating.

Upgrading Your PSU

One thing to remember, as with all PC components, you can always choose to upgrade your PSU. If you ever choose to upgrade your GPU, upgrading your PSU should be a priority too. You need to make sure you’re giving your GPU as much power as it needs to run properly, and you might even need to provide more PCIe power connections than your current PSU can provide – depending on the model.

But, don’t worry, upgrading your PSU is fairly simple. You just need a screwdriver, some cable-management love, and patience. If our PSU calculator has told you that you need to upgrade, then all you need to do is follow these simple steps.

  1. Shut off power to your PC and remove the power cord
  2. Remove the side panel of your PC case to gain access to all the technical goodies inside
  3. Remove all PSU power cables and connections from your components
  4. Remove any other components that are obstructing your access to the PSU
  5. Remove the screws on the back of the PC that attach the power supply to the case and remove the entire power supply unit
  6. Once you’ve safely disposed of your old PSU, place your new, upgraded PSU into position
  7. Screw your new PSU in and put back any other removed components
  8. Reattach all the power cables so your PSU is properly installed
  9. Power on your PC to check all the connections are working
  10. Turn your PC back off, reattach the side panel and enjoy your new PC build

Top FAQs

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.