FREE DISPLAY TEST
Measure your display’s Hz and compare motion at different frame rates.
You can also choose your own FPS.
Detected refresh rate Estimated
— fps
— ms
Keep this tab open for about 3 seconds while we measure the browser’s frame intervals.
Every row moves at the same speed. Follow a star with your eyes to compare motion smoothness.
QUICK GUIDE
Measurement starts when you open the page. Preset FPS shows 180, 165, 144, 120, 100, 60 and 50 fps, up to your display’s limit. The reference row stays in sync with the display. Measure again after moving the window to another monitor.
Custom FPS lets you edit each comparison row. Half & quarter compares the reference with half and one quarter of its rate: about 180, 90 and 45 fps on a 180 Hz display. The reference stays synchronized in every mode.
Every row moves at the same speed. A higher speed or the vertical-line pattern can make the steps in the motion easier to compare. You can pause the test at any time.
The result is an estimate based on the browser’s frame intervals. It does not read the monitor’s specifications or OS settings directly. A 180 Hz monitor may deliver about 60 Hz in the browser because of OS settings, power saving, browser behavior or load. A stable reading does not guarantee that the physical panel is running at that rate.
Hz is the number of display refreshes per second. FPS is the number of motion frames updated per second. This tool changes the FPS of the comparison animation; it does not change the monitor’s refresh rate.
You can enter a higher value, but visible updates are limited by the browser’s frame rate. A browser running at about 60 Hz cannot show the full smoothness of 120 or 180 fps. The requested FPS and this page’s actual update rate are shown separately.
The test targets an average of 120 updates per second. Since 180 is not an integer multiple of 120, frames stay on screen for uneven durations. This does not reproduce a true 120 Hz monitor. Choose Half & quarter to compare evenly spaced updates.
Close other busy tabs or apps, check power-saving mode and OS display settings, then measure again. Variable refresh rate (VRR) and multi-monitor setups can affect the result. Measurement stops while the tab is hidden and restarts when you return.
Measurement reference: MDN: requestAnimationFrame