HOW TO USE THE ESTIMATE
What this refresh-rate test measures
Browsers animate web pages using repeated frame callbacks. This tool times those callbacks while the page is visible, then estimates the typical interval between them. For example, an interval close to 16.7 milliseconds corresponds to roughly 60 browser animation frames per second; an interval near 8.3 milliseconds corresponds to roughly 120.
That is useful for a quick check if a browser seems to be updating at a lower cadence than expected. It is not the same as reading the monitor’s specification: the browser may be limited by the operating system, power mode, graphics load, browser settings or a variable refresh-rate mode. A high frame cadence also does not prove that a game or video is rendering at the same rate.
- Set the refresh rate you want to check in your computer or device’s display settings.
- Keep this page in the foreground, then start the six-second test.
- Run it again if the result varies, and close demanding apps to reduce unrelated slowdowns.
- Compare the estimate with the refresh rate selected in your system settings.
Interpreting changes: A result that moves between readings is not automatically a monitor fault. Laptop power-saving, browser throttling and adaptive-refresh behavior can all affect the browser’s animation cadence.