CPU Benchmark
Test your processor speed with a browser-based CPU benchmark and get a single-core, multi-core, and overall score.
Web workers are unavailable in this browser, so the multi-core phase ran sequentially.
The benchmark could not be measured on this device. Please try again.
Compared to reference
| Metric | Your | Reference |
|---|---|---|
| Single-core | 0 | 0 |
| Multi-core | 0 | 0 |
| Overall Score | 0 | 0 |
Reference machine
- CPU
- Memory
- GPU
- OS
Run history
No runs saved yet. Your completed runs will appear here.
| Date | Single-core | Multi-core | Overall Score | Tier | Detected cores |
|---|
How to Use CPU Benchmark
Getting Started
- The benchmark starts automatically when the page loads.
- Wait for the progress bar to reach 100%.
- Read your overall score, tier, and the single/multi-core figures.
Features
- Single vs multi-core: single-core measures one thread; multi-core spreads the work across all detected threads.
- Overall score & tier: a speed index (higher = faster) mapped to entry-level, mid-range, fast, or very fast.
- Run history: past runs are saved on this device (up to 20) so you can compare over time.
- Copy results: copies a short text summary of the latest run.
Tips
- Close other heavy tabs for a cleaner reading.
- Re-run a few times to see normal run-to-run variance.
What you can do with CPU Benchmark
A few common ways people use CPU Benchmark, from a quick score to comparing runs over time.
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Run the standard benchmark
The benchmark starts automatically when the page loads. Watch the progress bar and get a single-core, multi-core, and overall score with a tier within seconds.
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Compare single-core vs multi-core
See how one thread compares with all cores working together. The multi-core test runs the work in parallel across your processor's threads.
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See where your CPU stands
Read a plain-language tier - entry-level, mid-range, fast, or very fast - mapped from your overall speed score, without needing to interpret raw numbers.
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Track runs over time
Every completed run is saved on this device (up to 20) so you can re-benchmark later and compare variance. Clear the history whenever you like.
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Share or copy your results
Copy a compact, human-readable summary - date, single-core, multi-core, overall, tier, and detected cores - to share in a chat or forum.
Frequently Asked Questions
- How does this benchmark work?
- It runs a fixed set of CPU-heavy calculations (integer math, floating-point, string work, and hashing) in your browser and measures how long they take. Heavier work finished faster means a higher score. Everything runs locally - nothing is sent to a server.
- Why do I see a single-core and a multi-core score?
- The single-core score measures how fast one thread performs the work. The multi-core score runs the same work in parallel across your processor's threads using web workers. Together they show both per-core speed and total throughput.
- What does the overall score and tier mean?
- We normalize the combined single- and multi-core timings into an index where higher is faster (a reference-fast CPU scores around 938, and faster machines go higher). That index is mapped to a fixed tier (entry-level, mid-range, fast, or very fast). The tier is a simple, comparable label for what your CPU can do in the browser.
- Why is my score lower on a phone or shared computer?
- Mobile devices and shared or remote machines expose fewer cores and often run JavaScript with a different engine or under thermal limits. The benchmark reports the cores it detects, so you can compare results on the same kind of device.
- Is my data safe?
- Yes. The benchmark runs entirely in your browser. Results are stored only on your own device in localStorage (if you keep history) and are never uploaded to any server.