Display timing · 30-second sample
Refresh Rate Test
Estimate your browser’s refresh cadence in Hz, inspect frame timing consistency, and troubleshoot a screen that appears limited to 60 Hz.
Ready when you are.
Estimated refresh cadence
Observed browser timing · not maximum display Hz
- Median interval
- — ms
- Interval spread (P95 − P5)
- — ms
- Recorded intervals
- 0
0.0 / 30 s
This measures browser animation callbacks, not the monitor’s maximum refresh rate or physical scanout. Browser limits, variable refresh, power settings and background work can affect the estimate.
Get a useful reading
- Move this window fully onto the display you want to check. Set its refresh rate in your operating system first.
- Close heavy workloads and keep this tab visible and focused. Start the test and wait through the 2-second warm-up and 30-second sample.
- Compare repeat runs under the same conditions. Changing the window size, switching tabs or losing focus interrupts the run.
Read the result
Hz is estimated from the median interval between animation callbacks. The spread is the 95th minus the 5th percentile interval. A smaller spread means more consistent browser timing; it is not a display quality score.
If a high-refresh monitor reads near 60 Hz, check display settings, browser power saving, hardware acceleration and your cable connection. Try another browser. This page cannot identify which factor is responsible.
Refresh rate questions
Is this different from an FPS test?
Yes. This page uses a light callback loop to estimate cadence. The FPS test measures frame pacing under its own workload. Neither result promises the FPS you will get in a game.
Can it prove my display supports 144, 165 or 240 Hz?
No. A consistent reading close to one of those values is an observation of this browser session. Check the display specification and operating system settings for supported modes.
What does consistent timing mean?
After the full sample, timing is labeled consistent when the 5th-to-95th percentile spread is at most 8% of the median interval. This is a tool heuristic, not a hardware certification. Interrupted runs have no final estimate.