Refresh Rate Test
Shows the refresh rate your screen is running at right now, in Hz. Keep this tab in front and wait about 15 seconds for a steady reading.
Measuring…
More Hardware Test Tools
This test shows the refresh rate your screen is actually running at, not the number on the box. It times how often the browser draws a frame, which follows the screen's refresh, and reports the rate to two decimals with the closest standard rate, the time between frames and any frames the browser missed.
How to Get a Reliable Reading
- Keep this tab in front and the window on the screen you want to test.
- Close heavy tabs and, on a laptop, plug in and turn off battery saver.
- Wait about 15 seconds without moving the window.
- Compare the result with the rate set in your display settings.
Refresh Rate and Frame Interval
The interval is 1,000 divided by the rate in Hz.
| Refresh rate | Time per frame |
|---|---|
| 60 Hz | 16.67 ms |
| 75 Hz | 13.33 ms |
| 120 Hz | 8.33 ms |
| 144 Hz | 6.94 ms |
| 165 Hz | 6.06 ms |
| 240 Hz | 4.17 ms |
| 360 Hz | 2.78 ms |
| 500 Hz | 2.00 ms |
If the Result Is Lower Than Your Monitor's Rating
- Windows: Settings > System > Display > Advanced display > Choose a refresh rate. With more than one monitor, select the right one first. Rates marked with an asterisk change your resolution.
- Mac: Apple menu > System Settings > Displays > Refresh Rate. MacBook Pro models with ProMotion can choose ProMotion for an adaptive rate up to 120 Hz.
- Cable and port: high rates at high resolutions need a cable and port that can carry them. Try DisplayPort, or a newer HDMI cable and port.
- Graphics driver: an outdated driver can hide higher rates.
Why a Browser Can Measure Refresh Rate
Browsers schedule animation frames to match the display, so a page can count how many frames it is given each second. This test uses the median gap between frames, which ignores the odd late frame, and counts frames that came far too late as missed instead of averaging them in. It cannot read the monitor's maximum rate; it shows the rate in use right now.
To see how your browser holds up when it has real drawing work, try the FPS test. To check motion clarity at your refresh rate, use the ghosting test.
Refresh Rate Questions
Why does it show 60 Hz on my 144 Hz monitor?
The screen is most likely set to 60 Hz. Windows often starts a newly connected monitor at 60 Hz. Change it in Settings > System > Display > Advanced display. If the higher rate is missing there, the cable, the port or the graphics output may not support it.
Why is the measured number 59.94 or 143.98 instead of a round figure?
Monitors and graphics cards run at timings that are slightly off the label, and the browser's clock adds a little noise. The test rounds to the closest standard rate for the headline.
I have two monitors. Which one is measured?
The one this browser window is on. Drag the window to the other screen and press Reset.
Why is my laptop reading lower than its rating?
Battery saver and power settings can cap the browser's frame rate, and Windows Dynamic Refresh Rate or Apple ProMotion change the rate with what is on screen. Plug in, turn off battery saver and test again.
What are missed frames?
Frames that came much later than the usual interval, because the page was busy. A few are normal. A count that keeps rising means other work is slowing the browser, so the reading may be low.
Does G-Sync or FreeSync change the result?
Variable refresh lets the screen follow the game's frame rate. On a desktop with an ordinary browser window the screen usually runs at its set rate, but some setups show a lower or wandering number.
Is refresh rate the same as FPS?
No. Refresh rate is how often the screen redraws. FPS is how many new frames the computer produces. A browser never draws faster than the screen refreshes, which is why this test can measure it.
Last updated October 2026. Settings paths checked against Microsoft's and Apple's refresh rate support pages.