When it comes to building a computer or an electronics project, choosing the correct power supply unit (PSU) can be a tricky task. The power supply is responsible for converting the AC voltage from your wall outlet into DC voltage that your computer components can use. Furthermore, it needs to deliver the correct amount of power and have the appropriate connectors to avoid damaging your components. Fortunately, there are many online power supply calculators that can help you to make an informed decision. In this article, we will discuss the best online power supply calculators out there.

1. OuterVision – This website provides one of the most comprehensive and accurate power supply calculators available. It contains an extensive database of components, so you can select your exact components, including graphics cards, CPUs, and drives, to calculate the total power requirement. One of the significant advantages of this calculator is that it also provides you with a detailed list of recommended power supply units based on your component selection.

2. Cooler Master – This calculator from Cooler Master is another excellent option for calculating your power supply needs. It is relatively simple to use and provides a clear breakdown of power requirements for different components in your system. The calculator also provides you with a recommended wattage range and a list of Cooler Master power supply units that will meet your needs.

3. Newegg – Newegg’s power supply calculator offers a user-friendly interface, and the results are quickly generated. The calculator enables you to select the components in your system, including CPU, memory, graphics card, and hard drives, and it provides a recommended power supply wattage as well as a product list of suggested PSUs.

4. be quiet! – If you are looking for power supply calculators that cater to a specific brand of power supply unit, then be quiet!’s calculator is the one for you. The tool is designed for those who are specifically interested in buying a be quiet! PSU, but it still provides accurate wattage recommendations for other power supply brands. Besides, the calculator also offers explanations of the technical terms, which is helpful for those who are new to computer hardware.

5. EVGA – EVGA’s power supply calculator is perfect for those who own EVGA components or are interested in purchasing EVGA power supply units. The interface is user-friendly, and the calculator offers the option to select among different models of Power Supply Units. The tool provides real-time calculation of your system’s power demands, and it also allows you to calculate the total power needs of multiple systems.