PC Bottleneck Calculator
Select your CPU, GPU, resolution and use case, and we’ll tell you which component is holding your system back and by how much.
About this calculator
The result shows which part limits your frame rate at the resolution you picked, and roughly how much faster your graphics card would run if it were paired with the fastest gaming CPU available. It is a range, not a single number: the low end reflects lighter games, the high end reflects CPU-heavy games such as simulators, strategy games and MMOs. It is a model built from published benchmarks, not a measurement of your PC.
Where the numbers come from
CPU gaming scores come from Tom’s Hardware’s 2026 CPU benchmark hierarchy (1080p, RTX 5090, 17 games), with older AM4 and a few other chips placed using TechPowerUp and TechSpot head-to-head tests. GPU frame rates come from Tom’s Hardware’s 2026 GPU benchmark hierarchy at 1080p, 1440p and 4K. A handful of newer or untested parts are estimated from their closest measured sibling.
Why different calculators give different numbers
There is no universal standard for measuring a bottleneck. Every calculator online uses its own formula, so exact numbers will never match from one tool to the next. That is why we show a range and a plain verdict instead of a single precise percentage. Focus on which part is the limit and on how the result changes when you switch resolution. Those signals are far more reliable than any one figure.
How to verify a bottleneck on your own PC
The most accurate way to check for a real bottleneck is to monitor your CPU and GPU usage while gaming using MSI Afterburner or HWiNFO. If your CPU is consistently running at 95 to 100% while your GPU sits below 70 to 75%, your CPU is genuinely the limiting factor. If both are above 90%, the system is well matched. If your GPU is at 99% and CPU is below 80%, the GPU is the limit, which is normal and healthy at higher resolutions.
What this calculator cannot account for
Game engine architecture varies significantly. Some titles are heavily single-threaded, others scale well across many cores. RAM speed, background processes, driver version, and whether a game uses DirectX 12 or Vulkan all affect real-world performance in ways no static calculator can model. Use this tool as a starting point for upgrade planning, not as a diagnostic verdict on your specific system.
Our commitment to accuracy
The performance scores used in this calculator are built from published benchmark data across a wide range of CPU and GPU pairings. We update them when new hardware launches. If you notice a result that seems significantly off compared to your real-world experience, that is useful feedback. The gap between estimated and actual performance helps us improve the model over time.