Output
Arithmetic operation count; worker count
UserBenchmark / All Tools / CPU Stress Test
Performance
CPU Stress Test
Run a bounded calculation workload in workers with an immediate Stop control.
Free to useNo downloadNo sign-up
CPU Stress Test · At a glance
Quick answer: Run a bounded calculation workload in workers with an immediate Stop control. Operation count reflects this JavaScript worker task.
CPU Stress Test
The test loads when you open it. Device access is requested only after you choose to start.
Detailed guide
How to use this tool
- Begin with a small worker count and run the bounded arithmetic workload.
- Use Stop whenever you want to end the test.
Input
Bounded parallel workload
Browser requirement
Web Workers; maximum 8 workers
Processing
Runs on your device; no tool-result upload
How it works and what the result means
The result counts arithmetic operations performed by web workers. It measures this JavaScript workload, not whole-system stability, temperature or a standardized native CPU score.
Reading the result
Operation count reflects this JavaScript worker task. It is not a native CPU benchmark score or proof of full-system stability.
What to check next
Compare at the same worker count and power setting. Browser limits, background tasks and cooling can change the count.
Heavy workloads can make a device warm. Increase worker count gradually; this tool limits parallel workers and runtime.
Frequently asked questions
Will it show CPU temperature?
No. Standard browser APIs do not provide a reliable CPU temperature reading. Use the appropriate system monitoring tool when thermal data is needed.
How do I start the CPU Stress Test?
Choose a small worker count and start the bounded workload. Stop at any time, or let the round finish automatically.
Does this tool require a download or an account?
No. Open the interactive tool above in a modern browser. The instructions and explanations are available even with JavaScript disabled; running a test needs JavaScript.
Why can two attempts give different results?
Power settings, background tasks, browser scheduling, operating-system input processing and device settings affect measurements. Compare repeated attempts with identical settings rather than the single highest score.