Building a PC can feel confusing, especially with power needs. A simple tool can remove the stress. A power supply calculator checks your parts, like CPU, GPU, storage, and fans, then estimates how much wattage your system needs. This helps avoid buying a unit that is too weak or wasting money on one that is too strong. With clear numbers, you can focus on stability, safety, and future upgrades while keeping your setup balanced and reliable for daily use and long-term performance.