Monitor Refresh Rate Test
Check your screen's real refresh rate, frame consistency and stability grade — plus a motion clarity test and VRR/G-Sync simulator most other tools don't have.
Keep this tab active and in focus. Reading stabilizes after ~2 seconds. For best accuracy, use fullscreen and confirm your OS display setting is already at max refresh rate.
Watch the moving blocks. On a high refresh-rate screen, edges stay crisp even at 4x speed. On 60Hz, expect visible ghosting and motion blur — especially on the fastest block.
Fixed Refresh Rate (simulated tearing risk)
Frame delivery timed to a rigid interval. When the GPU can't keep up, frames arrive late and either tear or stall — visualized here as irregular red gaps.
Variable Refresh Rate (G-Sync / FreeSync style)
The display refresh window stretches to match each frame as it's ready — shown as smoothly adapting green bars instead of rigid, missed intervals.
What Is Monitor Refresh Rate?
Refresh rate (Hz) is how many times per second your display redraws the image on screen, determined by the panel hardware. A 60Hz monitor refreshes 60 times per second (16.67ms per frame); a 144Hz monitor refreshes every 6.94ms. Higher refresh rate means smoother motion and lower perceived input lag.
How This Tool Measures Your Refresh Rate
The browser can't read your monitor's EDID directly, so this test uses
requestAnimationFrame() — a callback the browser fires in
sync with your display's vertical refresh. By timing the gap between
consecutive callbacks over a rolling window, we calculate a live Hz
reading, then track the average, min, max, and — uniquely — a
stability grade based on how consistent your frame
timing actually is, not just the peak number.
Stability Grade formula: we measure what percentage of frames land within ±15% of your median frame interval. 95%+ consistent frames = Grade A. Below 60% = Grade F, meaning your refresh rate number may look right on average but is unstable in practice (often caused by background load, power-saving mode, or a mismatched cable standard).
Why This Goes Beyond a Basic Hz Checker
Most refresh rate testers online just show one live number. This tool adds three things you won't usually find together: a frame-time consistency chart that flags dropped frames individually, a 3-speed motion clarity test to see ghosting with your own eyes, and a VRR simulator that visually explains why G-Sync/FreeSync smooths out frame-rate fluctuations that a fixed refresh rate can't handle.
| Refresh Rate | Frame Interval | Best For | Rating |
|---|---|---|---|
| 60 Hz | 16.67 ms | Office, web browsing, video | Fine |
| 75–90 Hz | 11.1–13.3 ms | Casual gaming, smoother scrolling | Good |
| 120–144 Hz | 6.9–8.3 ms | Mainstream competitive gaming | Great |
| 240 Hz | 4.17 ms | Esports / professional play | Elite |
| 360 Hz+ | <2.8 ms | Top-tier competitive FPS | Pro |