Refresh Rate Test (Monitor Hz)
Detect your display’s true refresh rate in hertz. The test watches your browser’s animation clock for a few seconds, then reports the rate it locked onto and how steady it was — keep this tab in focus while it measures.
Collecting frames…
Refresh rate is how many times per second your display redraws the image on screen, measured in hertz (Hz). The higher the number, the smoother motion looks and the less lag you perceive. It’s related to frame rate (FPS) but not the same: the refresh rate is the ceiling, so a display can’t show more unique frames per second than its Hz — a 60 Hz screen tops out at 60 distinct frames a second no matter how many your device produces.
This test measures your display’s actual refresh rate right in the browser. It fires requestAnimationFrame once per refresh and records the gap between callbacks for a few seconds, then takes the median so the odd slow frame doesn’t skew the result. Inverting that median gives the rate, which we snap to the nearest standard if it’s close. The histogram shows the spread of frame intervals — a tall, narrow spike means a rock-steady display. The “Stability” figure is the share of frames within 10% of the typical interval; high means a locked, consistent rate.
Common refresh rates
| Refresh rate | Where you see it | How it feels |
|---|---|---|
| 60 Hz | Office monitors, laptops, most phones | Standard — smooth enough for everyday use |
| 75 Hz | Budget monitors | A mild step up from 60 Hz |
| 120 Hz | Newer phones, TVs | Noticeably smoother scrolling and motion |
| 144 Hz | Gaming monitors | The popular gaming standard |
| 240 Hz+ | High-end esports displays | Ultra-smooth; an edge in competitive play |
Why might the reading look off?
- Keep this tab focused — background tabs are throttled and will read low.
- On a laptop, plug in. Many switch to 60 Hz on battery to save power, and some browsers cap the animation clock at 60 Hz regardless of the panel.
- Variable refresh rate (G-Sync / FreeSync / ProMotion) can make the rate fluctuate, which shows up as a lower stability and a wider histogram.
- With multiple monitors, the result reflects the display this browser window is on.