All screen test tools

    Refresh Rate Test

    Estimate your browser’s presentation rate and inspect frame intervals. Compare settings on the same screen with an eight-second sample.

    • Browser Hz estimate
    • Frame interval chart
    • Copy sample results

    Ready to sample

    Estimated presentation Hz

    —Hz

    One-second warm-up · Eight-second sample · Slow callbacks included

    Median interval
    —
    95th percentile
    —
    Longest interval
    —
    Intervals above 1.5× median
    —
    Callback intervals
    0
    s sampled
    0.0
    Recent callback intervals (ms)0–20.0 ms

    One-second warm-up · Eight-second sample · Slow callbacks included

    How to use

    1. Move this window to the display you want to check. Keep it visible and close demanding background tasks.
    2. Start the test. After a one-second warm-up, keep the tool in view for eight seconds.
    3. Compare the estimated rate with your operating system’s display settings. A 144 Hz screen can still be limited to 60 callbacks per second by the browser or power policy.
    4. Restart after changing settings or moving the window to another display. Backgrounding or leaving the tool restarts the sample.

    What to keep in mind

    This measures requestAnimationFrame callback timing, not the panel’s maximum refresh rate, physical skipped frames, response time or input lag. Variable refresh, power saving and browser load can affect the result. Small decimal differences are not a hardware verdict.

    Questions

    Why does a high-refresh monitor show about 60 Hz?

    Check the operating system’s refresh setting, power-saving mode, browser, connection and selected display. The reading describes this browser session and does not identify the cause automatically.

    How is the estimate calculated?

    Hz is 1000 divided by the mean callback interval. Median, 95th percentile and longest interval are also shown. Slow callbacks remain in the sample; consistency is a description of this sample, not panel certification.

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