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Monitor Refresh Rate Test

Check your monitor's refresh rate (Hz) right in your browser, and make sure a 144Hz monitor isn't running at 60Hz.

Refresh rate of this screen

about-Hz

Getting ready to measure.

Measuring. Leave this window as it is for a few seconds.

This matches the highlighted standard refresh rate below. If it is lower than your monitor's maximum, go through the checklist below.

This doesn't match a standard refresh rate. Power saving, variable refresh rate (G-Sync, FreeSync) or load from other programs may be the cause, so measure again.

If you got around 30Hz, a laptop battery saver or the browser's power saving feature may have reduced screen updates. Plug in the power and measure again.

Not enough screen updates were received. Make sure the window isn't covered or minimized, keep this tab in front and measure again.

The tab was hidden, so measuring stopped. It will measure again when you come back to this tab.

This browser can't run the test. Open the page in a recent version of Chrome, Edge or Firefox.

Measured
- Hz
Frames received
-

Standard refresh rates

  • 60Hz
  • 75Hz
  • 100Hz
  • 120Hz
  • 144Hz
  • 165Hz
  • 180Hz
  • 240Hz
  • 360Hz

Monitor Test: Dead Pixel and Ghosting Test Mouse Polling Rate Test PC Bottleneck Check

How to check your monitor's Hz in Windows settings

  • Windows 11: open Start > Settings > System > Display > Advanced display. The Display information panel shows the current refresh rate, and you can change it under 'Choose a refresh rate'.
  • Windows 10: open Start > Settings > System > Display > Advanced display settings. With several monitors, pick one under 'Choose display', then look at 'Refresh rate'.

Look up the maximum refresh rate by model name on the maker's spec sheet. If Windows or this page shows less, follow the checks below.

144Hz monitor showing 60Hz? What to check

Go through these from the top, and measure again on this page after each change.

  1. Windows display settingsIn Settings > System > Display > Advanced display, set 'Choose a refresh rate' to the highest value. After reinstalling Windows or the driver, it is often back at 60Hz.
  2. Cable and portOlder HDMI cables may not carry a high refresh rate. Switch to DisplayPort or the cable that came with the monitor, plugged into the graphics card.
  3. Graphics driverWithout a proper driver, high refresh rates may not appear in the list. Install the latest driver from NVIDIA, AMD or Intel.
  4. The monitor's own menuSome monitors only unlock their maximum refresh rate after you turn on an overclock or high refresh mode in the on-screen menu (OSD). Check the monitor's manual.
  5. Laptop power and the browserLaptops may lower the refresh rate on battery. Plug in, turn off the browser's power saving and measure again.

144Hz monitor stuck at 60Hz? Start with Windows

Lutimize (our app) sets your monitor to its maximum refresh rate. If you don't press 'Keep' within 15 seconds, it goes back. It can't fix cable or driver problems.

See Lutimize

Dual monitor refresh rate test

The browser measures the monitor this window is on. For another monitor, move the window fully onto it and press 'Measure again'.

How different are 60Hz and 144Hz?

The screen changes about every 16.7 ms at 60Hz, 6.9 ms at 144Hz and 4.2 ms at 240Hz (1000 ms ÷ Hz). You only see the difference if the game reaches that many FPS.

How it measures, and its limits

It collects the intervals of the browser's redraw signal (requestAnimationFrame) for about 2.5 seconds, takes the median and matches it to the nearest standard value. It doesn't read the monitor directly, so results can differ in these cases.

  • If the tab is hidden or the window is minimized, the browser stops redrawing and nothing can be measured.
  • Power saving or battery saver can show a lower value, and iPhone and iPad Low Power Mode caps it at 30Hz.
  • With variable refresh rate (G-Sync, FreeSync), or a window spanning two monitors, results may vary.
  • In Firefox, turning on fingerprinting protection (resistFingerprinting) always gives 60Hz.
  • Measurements are not sent to our server. Usage statistics record only that a test finished and which standard value range the result falls in.

Common questions

My monitor is 144Hz but it shows something like 143.9Hz

That's normal. Monitor timing and measurement error shift it slightly (for example 59.94Hz); the large number is the nearest standard value.

Is refresh rate the same as game FPS?

Yes. Refresh rate is how often the monitor redraws per second, FPS is how many frames the game makes per second, and you only see new frames at the lower of the two.

Does the refresh rate test work on phones and iPhone?

Yes. In low power mode it may show 30Hz, and some devices change their refresh rate on their own depending on what is on screen.

How do I check a laptop's refresh rate?

Open this page on the laptop screen and plug in before measuring. For an external monitor, move this window there and press 'Measure again'.

How is this different from the UFO test?

Watching a moving object by eye is often called the UFO test. This page times redraws and shows Hz as a number; to see motion blur, use the ghosting test in our monitor test. Ghosting test

Are my results saved?

No. Measurements are calculated only inside this browser and are not added to the page address. Reloading starts a new measurement.

Last reviewed 2026-11-07