Refresh Rate Test (Monitor Hz Test)
Run a free refresh rate test to detect your monitor Hz in 3 seconds. This online Hz test counts the frames your browser renders, which normally matches your screen's refresh rate, and works on any monitor, laptop, or phone. No software, no download.
What Is Monitor Hz?
Hz (hertz) is your monitor's refresh rate, meaning how many times per second your screen updates the image. A 60Hz monitor refreshes 60 times per second. A 144Hz monitor refreshes 144 times per second. Higher Hz means smoother motion, lower input lag, and a more responsive feel in games.
How to Use the Monitor Hz Detector
Click Detect My Hz
Wait 3 seconds while the tool counts your screen refresh cycles
See your detected refresh rate
Compare it to your monitor's advertised spec
Monitor Hz Comparison
| Refresh Rate | Frame Time | Best For |
|---|---|---|
| 60Hz | 16.7ms | Office work, casual use |
| 75Hz | 13.3ms | Budget gaming monitors |
| 120Hz | 8.3ms | Console gaming, mid-range |
| 144Hz | 6.9ms | PC gaming, esports |
| 165Hz | 6.1ms | High refresh gaming |
| 240Hz | 4.2ms | Competitive esports |
| 360Hz | 2.8ms | Pro tournament play |
Why Is My Detected Hz Lower Than Expected?
If your monitor is rated at 144Hz but the detector shows 60Hz, check these things: your GPU cable (HDMI 1.4 caps at 60Hz for high res, use DisplayPort), your Windows display settings (right click desktop, Display Settings, Advanced Display, set refresh rate manually), and whether your GPU drivers are updated.
How to Check Your Refresh Rate on Any Device
The fastest way is the refresh rate test above, which works everywhere. You can also confirm it in your system settings:
Windows 11 / 10: Right click the desktop, open Display Settings, scroll to Advanced Display, and read the Refresh Rate. Set it to your monitor's maximum if it is lower.
Mac: Open System Settings, go to Displays, hold Option and click Refresh Rate to see all supported rates.
Android: Settings, Display, then Refresh Rate or Smoothness. Many phones default to 60Hz to save battery even on 90Hz and 120Hz panels.
iPhone: ProMotion iPhones (Pro models) run up to 120Hz. There is no manual Hz toggle, but the refresh rate test above will read it live.
Want to see the difference your refresh rate makes? Try the UFO motion test to watch 60, 120, and 144 FPS side by side.
Frequently Asked Questions
How do I check my monitor refresh rate?
Use the Monitor Hz Detector on this page. It measures your actual screen refresh rate using requestAnimationFrame in your browser. You can also check in Windows by right-clicking the desktop, selecting Display Settings, then Advanced Display.
What is the difference between Hz and FPS?
Hz is your monitor's refresh rate (hardware limit). FPS is how many frames your GPU produces per second. If your GPU produces 200 FPS but your monitor is 60Hz, you only see 60 frames per second. They need to match for best performance.
Is 144Hz worth it over 60Hz?
For gaming yes, especially fast-paced games. The difference in smoothness and input lag is clearly noticeable. For office work and video watching, 60Hz is sufficient.
How accurate is this online Hz test?
It is usually accurate to within a few Hz on a healthy, unthrottled system, and it shows you both the raw measurement and the matched standard rate so you can judge for yourself. It measures how fast your browser renders frames, which normally equals your refresh rate but can read lower if your laptop is on battery saver, the browser is throttling, or variable refresh rate is active. For the best reading, keep the tab active, close heavy apps, and plug in your laptop.
Why does the refresh rate test show 60Hz on my 144Hz monitor?
The most common reasons are Windows display settings still set to 60Hz, a slow cable (HDMI 1.4 caps high resolutions at 60Hz, use DisplayPort), a laptop on battery throttling the browser, or outdated GPU drivers. Fix those and run the test again.
Can I test my phone or laptop refresh rate?
Yes. This Hz test works on any device with a browser, including Android and iPhone. Many phones default to 60Hz to save battery even on 90Hz or 120Hz panels, so enable high refresh rate in display settings before testing.