Timing budgetFPS ↔ ms
FPS to Frame-Time Calculator
Translate throughput into the time available for a single frame, then use that budget as a reference line on a capture.
FPS
Open the complete frame-time calculator →
Free PC performance tools
Free Tools for Measuring PC Bottlenecks and Performance
Choose by question: Convert a timing target, compare rendering geometry, diagnose a real machine or model a named CPU and GPU pairing. Each tool produces a different kind of evidence.
Quick calculators
Turn specifications into useful targets
These focused tools answer a different question from the main pairing model. Results update in the browser and do not upload system data.
Resolution Pixel-Load Calculator
Compare two rendering surfaces before testing how the additional pixels affect GPU time, memory traffic and VRAM.
Open the complete resolution calculator →PC Bottleneck Diagnostic Checklist
Preserve the target, baseline, false-positive checks and one-variable tests in an order that can reject a bad hypothesis.
Target
Baseline
Exclusions
Response
CPU and GPU Scenario Calculator
Choose two named components, then define the resolution, frame target and workload that make the pairing question meaningful.
1080p competitive gaming240+ FPS · CPU-sensitive →
1440p gaming144 FPS · mixed pressure →
4K visual-quality gaming60 FPS · GPU-sensitive →
Local AI workloadGPU and memory-sensitive →
How to choose the right PC performance calculator
Use the frame-time calculator when you need to understand a refresh-rate target or interpret a performance log. Use the pixel-load comparison when planning a monitor or checking how much more rendering work a higher native resolution creates. Use the full CPU and GPU bottleneck calculator when the question is whether a particular pairing is directionally balanced for a defined workload.
- Start with frame time when the question is consistency or a refresh-rate budget.
- Start with pixel load when the question is a move between 1080p, 1440p or 4K.
- Start with the pairing calculator when two named components and a workload need comparison.
A calculator result is a hypothesis, not a benchmark
No online tool knows the exact game scene, application version, firmware, memory configuration, cooling, power limits or background processes on your PC. The pairing model therefore reports relative headroom and a likely limiting direction. It does not promise average FPS, 1% lows or completion time.
Use one controlled measurement to verify the result
Choose a repeatable scene, record frame time, per-core CPU activity, GPU utilization, effective clocks, temperatures and memory pressure, then change one meaningful variable. Lowering resolution is a useful GPU-sensitivity test. If performance rises clearly, the graphics path had been limiting. If it stays flat while a CPU thread is saturated, investigate the processor, engine or memory path.
Why resolution and frame rate must be modeled together
Resolution changes the graphics work performed for each frame. Frame rate changes how often the CPU must prepare work and how small the end-to-end time budget becomes. A system can be well balanced at 1440p and 120 FPS, CPU-limited at 1080p and 240 FPS, and GPU-limited at native 4K. That is why a permanent bottleneck percentage for a hardware pair is misleading.
| Question | Best tool | Next evidence |
|---|---|---|
| How many milliseconds are available per frame? | FPS to frame-time calculator | Frame-time graph and percentile lows |
| How much does a resolution increase pixel work? | Resolution pixel-load calculator | GPU utilization, clocks and VRAM |
| Which part is more likely to limit my target? | CPU and GPU scenario calculator | Controlled in-app A/B test |
For the scoring inputs and severity bands, read the bottleneck calculator methodology. For a complete testing sequence, use the 20-minute PC bottleneck diagnostic.
When you are collecting evidence on a real machine, follow the interactive PC bottleneck diagnostic checklist so the baseline, false-positive checks and one-variable tests stay in the correct order.
