Our PC Power Supply Calculator is an essential tool designed to help professionals and system builders accurately determine their computer’s power requirements. This precise calculator analyzes your system’s components, including CPU, GPU, storage devices, and peripherals, to generate a detailed wattage estimate for your specific configuration. By providing accurate power consumption calculations, users can avoid the costly mistakes of choosing an underpowered or unnecessarily powerful PSU for their builds. IT professionals and system integrators can leverage this tool to streamline their build planning process and ensure optimal power delivery for their clients’ systems. Whether you’re building a workstation or planning multiple system deployments, our calculator helps you make informed decisions about power supply selection. Start using our PC Power Supply Calculator today to ensure your system gets the right amount of power it needs for stable, efficient operation.
Use the calculator to enter each PC part, add RAM, storage and cooling, then read the total watts and PSU size. A gaming build with an RTX 4090 alone can draw 350 W from the GPU (Nvidia GeForce RTX 4090 Specs, 2023). The tool adds every component, applies a 20 % overclock factor and a 30 % safety buffer, so you avoid freezes and overspending.
