A PC Bottleneck Calculator helps you find out if one part of your computer (usually the CPU or GPU) is limiting the full potential of the other. By entering your processor, graphics card, RAM, and resolution, the tool estimates how well-balanced your system is. If the bottleneck is too high (e.g., over 15%), your PC may not perform efficiently in games or tasks. It’s especially helpful when planning a new build or upgrading components.