Refresh Rate Test
Hertz, measured
What refresh rate are you on?
Measured from the gap between rendered frames, not read off a spec sheet. You get a number and a confidence figure telling you how much to trust it.
- Hz with a confidence score
- Starts before you press anything
- Snaps to real panel rates
- Frame rate shown alongside
—
Hz
Measuring quietly in the background.
Moving blocks reveal judder. Watch the fastest one.
Press start to begin measuring.
The estimate starts on its own the moment the page loads, from a couple of seconds of idle frames. Pressing start refines it.
Your display and device
Read from your browser on your own device. Some of it is deliberately vague — browsers round or hide these values to make you harder to track — so "not reported" is a normal answer.
Reference
What are the common refresh rates?
Where each one turns up, and how long a single frame lasts at it.
| Rate | Frame time | How it looks |
|---|---|---|
| 24 Hz | 41.67 ms | Cinema. Films have been shot at this rate since the 1920s. |
| 30 Hz | 33.33 ms | Broadcast television and most streaming video. |
| 48 Hz | 20.83 ms | Double-rate cinema, used by a handful of films. |
| 50 Hz | 20.00 ms | The old PAL broadcast standard, still common in Europe. |
| 60 Hz | 16.67 ms | The default almost everywhere: office monitors, laptops, phones. |
| 75 Hz | 13.33 ms | A small step up, often the highest a budget monitor will do. |
| 90 Hz | 11.11 ms | The comfort floor for VR headsets. |
| 100 Hz | 10.00 ms | Found on some ultrawides and mid-range gaming panels. |
| 120 Hz | 8.33 ms | Modern phones, tablets, consoles and most gaming laptops. |
| 144 Hz | 6.94 ms | The classic gaming monitor rate. |
| 165 Hz | 6.06 ms | A mild factory overclock of 144, and very common now. |
| 240 Hz | 4.17 ms | Competitive esports panels. |
| 360 Hz | 2.78 ms | The top end. Only worth it if everything else is already perfect. |
How can a web page measure Hz?
The browser gives a page one drawing callback per screen refresh. Time the gaps, take the median, and one divided by that gap is your refresh rate. The median rather than the average, because a single stall would drag a mean out of shape.
How accurate is it?
On a quiet machine it lands within a frame of the true rate and identifies common rates exactly. The estimate is snapped to the nearest real panel rate, because displays do not run at round numbers — 60 Hz is usually 59.94 and plenty of 120 Hz panels run at 119.88.
Why does it disagree with my display settings?
- Adaptive sync is on. The panel really is varying its rate. Expect lower confidence and a drifting number. Nothing is broken.
- A power profile is capping it. Laptops and phones routinely halve the panel rate on battery.
- The setting did not stick. A driver update or a cable change reset it.
- The window is on another display. The reading follows the browser window, not the machine.
Is refresh rate the same as FPS?
No. Refresh rate belongs to the display and is fixed; frame rate belongs to whatever is drawing and varies constantly. Because the browser paints in step with the display, a browser test can never show a frame rate above your refresh rate — which is why the number you get is the number you can actually see.
Set by the display and the cable. Your hard ceiling.
Produced by your device. Test it on the FPS Test.
Does a higher refresh rate help?
For anything you interact with, yes — each refresh is another chance to show the result of what you just did, so 144 Hz cuts the worst-case wait from 16.7 ms to under 7 ms. For video it is close to irrelevant: film is 24 and television is 25 or 30, and a fast panel just shows each frame several times.
How to use it
How do I check my refresh rate?
-
1
Quieten the machine
Close other tabs and anything playing video. The estimate is built from the gaps between frames, so interruptions blur it.
-
2
Run it for ten seconds
Watch the confidence figure under the number. Above 90% is solid; below 70% means something is interfering.
-
3
Compare with your settings
Open your display settings and see if they agree. When they disagree, the measurement is usually right and the setting is not being applied.
FAQ
Common questions
How do I check my monitor refresh rate?
Open this page on the display you want to check and read the gauge. It starts estimating within a couple of seconds; pressing start makes it more accurate.
Why does the number keep changing?
Either adaptive sync is varying the panel rate on purpose, or something else is interrupting the browser. Both show as a lower confidence figure.
Is 60 Hz bad?
Not at all. It is the standard for most work and all video. Higher is a real improvement for games and scrolling, but 60 Hz is fine for most of what people do.
Can I get a higher refresh rate without new hardware?
Sometimes. Check your display setting is on the highest option, the cable can carry it, and any overclock toggle in the monitor menu is on. Past that, the panel is the limit.
Why does my phone show 60 Hz when it says 120?
Battery saving, almost always. Charge it, turn off power saving, and check the display settings for a refresh rate option.
Keep going
More tools
Everything here runs in your browser, free, with no sign-up.
Measure your refresh rate
Close what you can, run it for ten seconds, check the confidence before you believe it.
Run the refresh rate test