🖥️ Refresh Rate Test
Measure your screen’s refresh rate in Hz, frame time and dropped frames in the browser, with a moving-block smoothness test. 60, 120, 144, 240 Hz.
At a higher refresh rate the block moves more often per second, so it looks smoother and faster at the same setting. Stutters show up as visible jumps.
What Refresh Rate Test Does
This refresh rate test measures how many times per second your screen redraws. Browsers render animation in step with the display, one frame per refresh, so the page times the gaps between frames and reports the rate — 60, 120, 144, 165, 240 Hz or whatever your display runs at — along with the frame time in milliseconds.
Because averages are thrown off by the occasional hiccup, the rate comes from the median frame time and is matched to the nearest standard rate. The test also reports frame-time jitter and late or dropped frames, draws a chart of recent frames, and animates a moving block so you can judge smoothness by eye.
How to Use Refresh Rate Test
- Press Start test and keep this tab in front
- Wait a few seconds for the measurement to settle
- Read the refresh rate and frame time
- Watch the moving block and adjust its speed to judge smoothness
- Check the frame chart for late or dropped frames
Formula Used by Refresh Rate Test
Refresh rate from frame time
Refresh rate (Hz) = 1,000 ÷ median frame time (ms)
Worked example
A median of 6.94 ms between frames.
- 1,000 ÷ 6.94 = 144.1
Result: 144 Hz.
Refresh Rates and Frame Times
| Refresh rate | Time per frame |
|---|---|
| 60 Hz | 16.7 ms |
| 75 Hz | 13.3 ms |
| 90 Hz | 11.1 ms |
| 120 Hz | 8.3 ms |
| 144 Hz | 6.9 ms |
| 165 Hz | 6.1 ms |
| 240 Hz | 4.2 ms |
| 360 Hz | 2.8 ms |
Source: Refresh rate — Wikipedia
How to Read Your Result
Getting the full refresh rate
If a high-refresh monitor reads 60 Hz, check the refresh rate setting in your operating system’s display settings, use a cable and port that support it (often DisplayPort or a recent HDMI version), and turn off battery-saving modes on laptops, which can cap the rate. Some browsers also limit animation in power-saving mode.
Smoothness vs rate
A steady 60 Hz looks smoother than an unsteady 120 Hz. Red spikes in the chart are frames the browser missed — caused by other work on the computer, heavy tabs or extensions — and show as stutter in the moving block.
Limitations & Accuracy Notes
- Measures the rate the browser renders at, which normally equals the display’s current refresh rate but can be capped by browser or power settings.
- Background tabs are paused or slowed by the browser; keep the tab in front.
- With several monitors, the result is for the monitor showing the browser window.