Refresh Rate Test
Estimate display refresh rate from animation frame timing with a moving visual track.
How to use this test
Press start and keep the tab visible until sampling completes. Run it on the exact monitor you want to check and avoid moving the window mid-sample.
How the measurement works
The test records requestAnimationFrame timestamps, discards warm-up frames and uses median and trimmed frame intervals to estimate the display refresh rate.
How to interpret results
A result near 60, 120, 144, 165 or 240 Hz usually reflects the active display mode. Variable refresh rate panels can drift, so repeated samples matter.
Troubleshooting tips
Check OS refresh settings, disable power saving, move the browser to the correct monitor and close full-screen video or remote desktop apps before retrying.
Related tests
You can also browse every utility from the complete tool index.
Common refresh rate questions
How do I test my monitor's actual refresh rate?
Move the browser to the monitor you want to test, start the refresh-rate sampler and keep the tab visible until it finishes. Compare the estimate with the display mode selected in your operating system.
Read full answer →60 Hz vs 120 Hz vs 144 Hz: what changes?
Higher refresh rates shorten the time between possible screen updates and can make motion and pointer movement look smoother. The benefit depends on content frame rate, hardware performance and how sensitive you are to motion differences.
Read full answer →Why does higher refresh rate feel smoother?
A higher refresh rate reduces the interval between display updates, so moving objects and pointer positions can be shown at more points in time. That can reduce visible judder and lower part of the display-side latency.
Read full answer →Why does a 144 Hz display show 143 or 145 Hz?
Animation-frame timing has normal jitter and some displays use fractional or variable timing. The test uses many samples and robust averaging rather than one frame.
Read full answer →