About BottleneckCalc

BottleneckCalc is a free PC bottleneck calculator. Pick a CPU, GPU, and resolution to get an estimated bottleneck percentage, a plain-English verdict, and a suggested upgrade when the gap is worth addressing.

Everything runs in your browser. There is no account system, no server-side processing of your selections, and no database of user builds. Performance scores live in static JSON files derived from aggregated public benchmark data.

Important: bottleneck percentages on this site are estimates, not lab measurements of your specific PC. Real-world results vary by game, settings, drivers, and memory configuration.

Start with the calculator or read our guides on what a bottleneck is.