At 144 Hz a new frame is due every 6.94 ms: 1,000 ms shared among 144 frames. The page calls a count a match when its average lands between 139.7 and 148.3, so 143.9 and 144.1 both read as 144.
Right nowframes a second
This is the browser's rate. The monitor's own rate can be higher.
120 Hz, 24 short of 144A frame every 8.33 ms, 1.39 ms longer than a frame at 144. Pick it when 120 is the rate you expect: the next count is then read against 116.4 to 123.6 frames a second.
144 Hz, the rate this page opens onAt 144 Hz a new frame is due every 6.94 ms: 1,000 ms shared among 144 frames. The page calls a count a match when its average lands between 139.7 and 148.3, so 143.9 and 144.1 both read as 144.
165 Hz, 21 above 144A frame every 6.06 ms, 0.88 ms shorter than a frame at 144. Pick it when 165 is the rate you expect: a match is then a count of about 160 to 170 frames a second.
Show all 16 rates and readings (13 more)
What a count means against 144 5
144 held for the whole countThe average fell between 139.7 and 148.3, so the browser drew about one frame every 6.94 ms from start to finish. That is the browser's rate, the most a web page can read. It does not show that every frame reached the glass.
A 60 on the 144 test60 frames a second is one frame every 16.67 ms, where 144 Hz has room for 2.4. Some browsers hold every page near 60 by default, so a sound 144 Hz screen can read 60 here. Count again in a second browser before you decide anything.
A 72, half of 14472 is every second frame: the usual frame lasted 13.89 ms, the length of two at 144. It is none of the rates this page names, so the page reads it as half of 144. The count cannot say why it happened.
A pace that wanders at 144The pace is called uneven when fewer than nine frames in ten keep within a quarter of the usual length, 5.21 to 8.68 ms at 144. A browser that rounds its clock too far for that check gets the average alone, and the page says which.
Frames missing at 144A frame counts as missing when it runs past one and a half times the usual length: beyond 10.42 ms when the usual one is 6.94 ms. The page says so once about one frame in 200 is gone, 7 or more in a ten-second count.
What moves while it counts 3
Graph: a line at 6.94 msEach frame adds one column as tall as the frame was long. A grey line a third of the way up marks 6.94 ms, so a steady 144 keeps every column on it. A column twice as tall lasted 13.89 ms. This view draws columns only.
Lanes: 144, 72 and 36 a secondThree blocks travel together. The top one is redrawn on every frame, the middle one on every second frame and the bottom one on every fourth: at a clean 144 that is 144, 72 and 36 pictures a second, one above the other.
Strip: about 230 moves to cross at 144A bar crosses the picture in about 1.6 seconds, moved once for every frame the browser draws: some 230 moves at 144, against 96 at 60. Equal moves mean equal frames. A sudden jump is a frame that never came.
144 Hz in numbers 5
6.94 ms: one frame at 144 Hz1,000 ms divided by 144 is 6.94 ms. A frame at 60 Hz lasts 16.67 ms, so 144 Hz shows 2.4 frames in the time 60 Hz shows one. The line under the figure prints the usual frame the count measured, to one decimal place.
144 Hz displays first appeared in 2012The first displays to refresh 144 times a second appeared in 2012. At that rate a picture stays up for about 6.9 ms, against 16.7 ms at 60 Hz, which is where the shorter frame on this page comes from.
144 is six times 24Movies are usually filmed at 24 pictures a second. 144 divides by 24 six times, so each film picture fills six whole frames at 144 Hz. It does not divide by 30 or 60: a 60-picture video gets 2.4 frames a picture.
A ten-second count at 144 keeps about 1,368 framesThe first half second of every count is left out while the page settles, so ten seconds keep 9.5. At 144 that is about 1,368 frames, not 1,440, and the line under the figure prints both numbers as counted.
Hz and frames a second: two counts that usually agreeHz says how often a screen shows a new image. Frames a second says how many images are made for it, and here the maker is the browser, whose frames generally follow the screen's rate. A game counts its own frames inside the game.
How this list was compiled: Written for this page. Every frame length, band and frame count here is arithmetic, worked out: a frame lasts 1,000 ms divided by the rate, a match is 3 percent either side of the rate, a ten-second count keeps 9.5 seconds, and 144 is 6 times 24. That a browser's animation callbacks generally match the display refresh rate, that 60 Hz is the most common rate with 75, 120 and 144 Hz also widely used, and that most browsers pause the callbacks in background tabs, is from https://developer.mozilla.org/en-US/docs/Web/API/Window/requestAnimationFrame, read 2026-10-06. That refresh rate is how often a display shows a new image and can be independent of frame rate, that movies are usually filmed at 24 frames a second, that 144 Hz displays first appeared in 2012 and that a picture at 144 Hz stays up for about 6.9 ms against 16.7 ms at 60 Hz, is from https://en.wikipedia.org/wiki/Refresh_rate, read 2026-10-06; Wikipedia text is under CC BY-SA 4.0 and is restated here in this site's own words. That one browser has a setting to prefer page updates near 60 frames a second, reported there as on by default, is from the reports on WebKit bug 173434, https://bugs.webkit.org/show_bug.cgi?id=173434 (open, last changed 2026-05-19), read 2026-10-06. The page counts how often the browser draws, which can be lower than the rate of the screen. Nothing here measures a monitor. Licence: own work
How it works
This 144Hz test counts the frames your browser draws for ten seconds and reads the average against 144 hertz (Hz), where one frame lasts 6.94 ms. It is the browser's rate: a sound 144 Hz screen can still read 72 or 60 here.
Read the full guide
How to test 144Hz
1. Press Start: 144 Hz is already picked.
2. Stay on this tab for the ten seconds, because a hidden tab throws the count away.
3. Read the figure. Anything from 139.7 to 148.3 counts as 144.
What the count says at 144
A frame at 144 Hz is due every 6.94 ms. The line under the figure gives the usual frame it measured: near 6.9 ms is 144, near 13.9 ms is 72, every second frame, and near 16.7 ms is 60.
Counting a 165 Hz screen? Pick 165 Hz first: its frame is only 0.88 ms shorter than one at 144.
Questions and answers
What does the 144 Hz test count?
The frames your browser draws, averaged over the count and shown to one decimal place. Browsers generally draw once for each refresh of the screen, so on a screen running at 144 Hz a browser that keeps up reads 144.
Is this a 144hz monitor test or a test of the browser?
Of the browser. A web page cannot see a monitor: it can only time its own frames. A count of 144 shows the browser drawing at 144, while a lower count does not show a slower monitor.
Is a 144 fps test the same thing?
Nearly. Hz is how often a screen shows a new image, and fps is how many images are made for it. This page counts the browser's frames a second, so it answers to both names. A game's 144 fps is counted inside the game.
Why does the count say 60 when I test if my screen is 144Hz?
Because this browser drew 60. Some browsers hold every page near 60 frames a second, and Safari is reported to do so by default, so 60 here is the browser's figure. Run the count in a second browser and compare.