FPS & Refresh Rate Test

How to read the results

• Current FPS is the number of frames drawn in the last second.
• Refresh rate is your display's rate in hertz, worked out from the typical time between frames and rounded to the nearest standard rate (60, 75, 120, 144, 165, 240 Hz and so on).
• Frame time is how long each frame stays on screen. Lower means smoother motion.
• Jitter is how much frame times vary. Smooth motion needs low jitter as well as high FPS.
• Dropped frames counts frames that arrived late and made the image hitch.

Comparing high and low frame rates

The three marbles move at the same speed, but the top one updates every frame, the middle one every second frame and the bottom one every fourth frame. On a 144 Hz monitor that means 144, 72 and 36 FPS. Watch how the lower lanes look jumpy and blurred: that is exactly the difference you feel in fast games. Try the faster speeds to make it more obvious.

How the test works

Your browser asks the page for a new frame each time the display refreshes, through a feature called requestAnimationFrame. The test records the precise time of every frame. The middle (median) gap between frames gives your refresh rate, the spread of those gaps gives the jitter, and any gap much longer than normal counts as a dropped frame. Nothing is uploaded: the test runs entirely on your device.

How to get your monitor's full refresh rate

1. Windows: Settings → System → Display → Advanced display, then choose the highest refresh rate.
2. macOS: System Settings → Displays, then pick the refresh rate. ProMotion MacBooks change rate automatically.
3. Cable: high refresh rates at high resolutions need DisplayPort, or HDMI 2.0 or 2.1 with a matching cable.
4. Browser: turn on hardware acceleration and turn off battery or efficiency modes.
5. Multiple monitors: run the test with the browser on the monitor you want to measure.

Common refresh rates and frame times

See the full refresh rate chart, or test a specific rate: 60Hz120Hz144Hz165Hz240Hz360Hz