Refresh Rate Test
Start the test to sample frame intervals for about 4 seconds and estimate your display's refresh rate; the moving blocks below make high-vs-low refresh differences visible.
Keep this tab in the foreground while measuring.
Reading the result
- The estimate rounds the measured frame rate to common tiers (60/90/120/144/165Hz). Slight decimals like 143.5Hz are normal timing jitter.
- A 144Hz panel measuring ~60 usually means the OS never enabled high refresh, the cable lacks bandwidth, or a battery saver capped it.
- Background tabs and heavy load lower the result — re-test with the page in front.
- Browsers can cap frame callbacks below your panel — a capped result shows the browser limit, not the screen limit.
Frequently asked questions
Why does my 144Hz monitor only measure 60Hz?
Common causes: high refresh not enabled in OS display settings, a cable that can't carry the bandwidth, laptop power-saving mode, or a browser frame-rate cap. Set the refresh rate in system settings first, then re-test.
Is a reading like 59.9Hz or 143.5Hz normal?
Yes. Browser frame callbacks have small timing jitter, so the estimate wobbles around the nominal value — read the rounded tier, not the decimals.
Is this an exact measurement?
It measures the browser's real render rate — enough to identify the current refresh tier. Power saving, background tabs and system load all push results lower; check the confidence note.
Does phone testing make sense?
Yes. iPhone ProMotion and high-refresh Android screens can reach ~120Hz in the browser. Some browsers or battery savers cap callbacks at 60Hz — in that case the result reflects the browser's ceiling, not the panel's.