A PC Bottleneck Calculator is a helpful tool designed to estimate the performance limitations in a computer system by identifying which component this tool—CPU, GPU, RAM, or storage—is restricting the overall performance. One of the primary benefits of using such a calculator is that it provides insight into how well different hardware components work together. This is particularly valuable when building a new PC or upgrading an existing one, as it helps users determine whether an upgrade in one area will result in significant performance improvement or be limited by another outdated component. For instance, upgrading to a high-end GPU may not yield expected results if the CPU is too weak to keep up—this is what’s commonly referred to as a "bottleneck."