TestLap
▾

Online refresh rate (Hz) test

Count real frames for 3 seconds to see whether the display runs at 60, 90, 120, 144 or 165 Hz, plus a motion test.

Measured refresh rate

—

 

Click the button and hold still for 3 seconds.

History

  • No measurements yet

Reported by the system

—

Motion test (UFO test)

Follow the moving block. On a high refresh rate display it looks smooth with little ghosting. The lower rows simulate lower rates for comparison.

Runs entirely in your browser. No data, images or audio are ever uploaded.

How to test in 3 steps

  1. 1

    Close heavy tabs and apps

    A busy system reports a lower rate than the real one. Plug in the charger so the laptop runs at full performance.

  2. 2

    Click "Measure refresh rate"

    The page counts how many frames the browser draws in 3 seconds and rounds to the nearest standard rate.

  3. 3

    Compare with the advertised spec

    Advertised 120 or 144 Hz but measured 60? Check your OS display settings first; the panel may be fine.

Reading the results

  • 60 Hz: standard for office laptops. Perfectly normal.
  • 90–120 Hz: premium display, noticeably smoother scrolling. Found on many ultrabooks from 2022 onwards.
  • 144 Hz and above: gaming display. If 144 Hz is advertised but you measure 60 Hz after fixing the OS setting, the panel may have been swapped for a cheaper 60 Hz one.
  • Unstable results: busy system or variable refresh rate. Measure again on mains power.

Tips for used gaming laptops

  • Watch the motion test at high speed: long ghost trails behind the block despite a high refresh rate mean a slow panel response time, so games will still smear.
  • High refresh panels are expensive to replace, so run the dead pixel test carefully, and check the system info to confirm the GPU matches the listing.
  • If a listing claims 144 Hz, insist on seeing this measurement on the machine itself before paying.

Frequently asked questions

My 144 Hz screen measures only 60 Hz+

Windows often defaults to 60 Hz. Go to Settings → System → Display → Advanced display and choose the highest refresh rate. Some gaming laptops also drop to 60 Hz on battery to save power, so plug in. Measure again after changing it.

The result jumps between two values, like 60 and 90+

The display has a variable refresh rate (VRR or Dynamic Refresh Rate) or the system is overloaded. Measure 2–3 times and take the highest value. Close any tabs playing video.

Is 59.9 Hz or 60.2 Hz a problem?+

Completely normal, it is measurement error in the browser. The tool rounds to the nearest standard rate, so just read the big number.

Can it measure an external HDMI monitor?+

Yes. Drag the browser window onto that monitor and measure. Note that HDMI 1.4 tops out at 60 Hz at 4K or 144 Hz at Full HD, so the cable may be the limit.

Does it work on a phone?+

Yes. Many 90 or 120 Hz phones drop to 60 Hz on low battery or on static pages. Tap and scroll lightly while measuring to wake up the high rate.