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Refresh Rate Test

The Hz your screen is running at, not the one on the box.

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Measured over three seconds. Keep this tab in front while it runs: browsers slow down animation in background tabs, and a laptop on battery often drops its panel to 60 Hz to save power.

How to test your refresh rate

  1. 1 Close what you can and leave this tab in the foreground, then press measure. The test watches three seconds of animation frames and reports the middle value.
  2. 2 Compare the result with what you set in your display settings. A 144 Hz monitor reporting 60 usually means the cable, the port or the graphics setting is holding it back.
  3. 3 On a laptop, run it once on battery and once plugged in. Power saving commonly halves the refresh rate, and that is a setting rather than a fault.
  4. 4 The slowest and fastest frame show how steady the display is. A wide gap between them points at background load rather than the panel.

Frequently asked questions

Why does my 144 Hz monitor show 60?
Almost always because something in the chain is set to 60: the refresh rate in the operating system's display settings, a cable that cannot carry more at that resolution, or a laptop saving power. Change the setting first, then the cable.
How accurate is a browser measurement?
It is close on a foreground tab, because browsers hand out one animation frame per screen refresh. It is not laboratory equipment: expect the odd hertz of variation and treat 143 as 144.
Why is the result higher than my screen's rated Hz?
Some browsers hand out extra frames when a screen is variable-refresh or when several displays run at different rates. Run the test with the window fully on the screen you want to measure.
Does a higher refresh rate matter outside games?
It mostly shows in motion: scrolling text and moving cursors look clearly smoother above 60 Hz. For still work the difference is small, which is why laptops drop it on battery without most people noticing.

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