Power Supply Calculator

Use our PSU Calculator to find the perfect power supply for your PC build. Input your components and the calculator will work out the best PSU taking into account the wattage requirements for your specific parts.

Choosing a power supply unit (PSU) for an upcoming PC build that can handle all the components is vital, but it can be confusing, tedious, and it’s easy to make mistakes.

That's why we built this PSU wattage calculator to help you calculate what power supply you need. Simply select your processor (CPU) and graphics card (GPU), then choose yes or no to the following questions. The calculator will automatically add a little more wattage to account for any power consumption from fans, RAM, storage, and cooling. So, you don’t need to worry about cutting it too close.

You’ll then be presented with the CORSAIR PSU for your needs, as well as a more premium option (with higher wattage for more upgradeability if available), and a capable budget version for those looking to save a buck.

It’s simple, really. It adds up the power requirements for your selected GPU and CPU, then adds some more to account for the other components typically found in a medium to high-end gaming PC. This extra amount correlates with the power draw needed for the following:

• Up to 4x sticks of RAM
• Up to 4x M.2 SSDS
• Up to 2x SATA SSDs
• An AIO CPU Cooler
• Up to 10x RGB fans

This results in an accurate calculation of the necessary wattage for your upcoming PC build. There are a couple more things it takes into account, though.

PC cases do not consume a meaningful amount of power, so your choice won’t make any difference to how much wattage you need. However, the size of your case will reduce the number of options due to physical size constraints. If you’re using a Small Form Factor (SFF) case, then the calculator will make sure to only recommend the smaller SFX or SFX-L power supplies that are guaranteed to fit in SFF cases.

Overclocking any part of your system will increase the amount of power used, so if you choose “yes” for this question, the calculator will recommend a higher capacity PSU. Most of us don’t need to worry about this, but having a PSU with more wattage than you need does make it less likely that you’ll have to buy a new one next time you upgrade.