Refresh Rate Test

A refresh rate test measures how many times per second your display redraws the image, in hertz (Hz). It is the easiest way to confirm that your monitor is actually running at its advertised rate — 60Hz, 120Hz, 144Hz, 165Hz or 240Hz — rather than being capped by a cable, driver or power setting.

Start the test below and watch the live reading. The measurement uses your browser's animation timing, so keep the tab focused and give it a few seconds to settle. A smoothly moving bar also lets you feel the difference a higher refresh rate makes.

Start Refresh Rate Test

It measures how many frames per second your browser can present, which on a healthy system equals your display's refresh rate in hertz (Hz). A 60Hz screen will read around 60, a 144Hz screen around 144, and so on. Let it run for a few seconds so the average can stabilize.

Common causes: Windows or macOS is still set to 60Hz (change it in Display settings), the browser window is on a different, slower monitor, a laptop is in battery-saver mode, or the cable/port (e.g. HDMI version) can't carry the higher rate. Browser throttling on an unfocused or background tab can also cap the result.

Refresh rate (Hz) is how often the display physically updates per second. FPS (frames per second) is how many frames the source — a game or app — produces. Your visible smoothness is limited by whichever is lower, which is why a 144Hz monitor only helps if the content also runs near 144 FPS.

It is a good real-world indicator but not a lab instrument. Browsers sync animation to the display, so the reading closely tracks the true refresh rate, but power management, variable-refresh-rate (VRR/G-Sync/FreeSync) and background throttling can introduce small variations. Run it full-screen with the tab focused for the most reliable number.

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