How to check your monitor's refresh rate
- Open this page on the screen you want to test and keep the tab visible. The measurement starts automatically.
- After a second or two, the large number shows the refresh rate in hertz, snapped to the nearest standard value such as 60, 120, 144 or 240 Hz.
- Compare the two moving UFOs: the top one moves every frame, the bottom one every second frame. On a high refresh rate display the top one looks clearly smoother.
- Press Measure again after changing display settings.
How the test works
Browsers draw animation frames in step with the display's refresh, using requestAnimationFrame. The test records the time between hundreds of frames and uses the median interval, which ignores occasional hiccups, to calculate the refresh rate. It also shows the frame time, the jitter (how evenly frames arrive) and the number of dropped frames, which helps diagnose stutter.
If the result is lower than your monitor's rating, check the display settings: on Windows, Settings → Display → Advanced display → Choose a refresh rate; on macOS, System Settings → Displays → Refresh rate. Also make sure you use a cable and port that support the rate (for example DisplayPort or HDMI 2.0+ for 144 Hz at 1440p), that the browser is not in battery-saver mode, and, on laptops, that the computer is plugged in. Some browsers cap animation at 60 Hz in power-saving modes, and variable refresh rate (VRR) screens may report the current rate rather than the maximum. Nothing is sent anywhere.
Why does it show 60 Hz on my 144 Hz monitor?
The monitor is probably set to 60 Hz in the operating system, or the cable or port does not support 144 Hz.
Does refresh rate matter outside gaming?
Yes. Scrolling, moving windows and the mouse pointer all look smoother at 90 Hz and above.
Can it test my phone?
Yes. Many phones show 90 or 120 Hz, though some lower it to save battery.