CPU & GPU Bottleneck Calculator

CPU & GPU Bottleneck Calculator is a free online tool. Check if your processor holds back your graphics card. Pick your parts or enter your numbers and the estimate updates instantly. Nothing needs to be submitted.

Open CPU & GPU Bottleneck Calculator. Set the options you want (processor (cpu), graphics card (gpu), resolution, games you play). Click Check bottleneck. Copy the result with one click.

Yes. It is completely free, with no usage limits, watermarks or paid tiers.

No. Open the page and start using it. There is no account, download or browser extension.

Yes. The calculation runs in your browser, so your settings and part choices are never uploaded or stored.

CPU & GPU Bottleneck Calculator has one mode: Check bottleneck. You can also set: processor (cpu), graphics card (gpu), resolution, games you play.

Yes. The layout adapts to any screen size, and the tool works in mobile browsers on iOS and Android.

Current versions of Chrome, Edge, Firefox and Safari. JavaScript must be enabled.

Yes. The result is yours to use in personal and commercial projects without attribution.

There is no fixed limit. Very large inputs depend on your device's memory and may feel slower on older phones.

Click the Copy button above the Result box. For tools that transform text, Use as input moves the result back to the input so you can apply another change.

After the page has loaded, yes. Processing happens in your browser, so the tool keeps working even if your connection drops.

Make sure every number field holds a valid number and that you picked parts from the lists. The message under the result points to the field to fix.

Estimates use approximate relative performance indexes and published power ratings, so treat them as a planning guide. Real results depend on the game, settings, drivers, memory and cooling.

Calculators work on one setup at a time. Change any setting to compare another build instantly.

Choosing a power supply before building a PC; Checking if a CPU or GPU upgrade is worth it; Matching mouse sensitivity across games; Estimating running costs, download times and odds.

You may also like PSU Wattage Calculator, GPU Comparison Tool, CPU Comparison Tool, FPS to Frame Time Converter. All of them are free and work in the same way.

They combine simple formulas with approximate relative performance and power data for popular parts. The goal is a realistic planning guide rather than a lab benchmark.

No. For a purchase decision, compare your estimate with independent benchmark reviews of the exact games and settings you care about.

It is designed for desktop parts. Laptop CPUs and GPUs run at lower power limits, so their real performance and power use are lower than the desktop figures.

Some imbalance is normal, because one part is always the limit. A GPU-limited system is ideal for gaming, while a heavy CPU limit means the graphics card is underused.

A CPU bottleneck happens when the processor cannot prepare frames as fast as the graphics card could draw them, so the GPU sits partly idle and your FPS is capped by the CPU.

Under about 10% is considered balanced and 10 to 20% is minor. Above 30% the CPU is clearly holding the GPU back, especially at 1080p and in competitive games.

Yes. Higher resolutions put more load on the GPU, which hides a weaker CPU. The same pair can show a CPU bottleneck at 1080p and almost none at 4K.

Use the contact link in the footer. Bug reports and tool ideas are welcome, and popular requests are added regularly.