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Kordu Tools
Gaming Runs in browser Updated 30 Mar 2026

Monitor Refresh Rate Test

Detect your monitor's actual refresh rate by counting real frames in the browser. See your Hz, frame times, and a live motion smoothness test. Supports 60Hz to 360Hz.

Detected refresh rate
--Hz
Common refresh rates
60 Hz75 Hz120 Hz144 Hz165 Hz240 Hz
Loading rating…

How to use Monitor Refresh Rate Test

  1. Open the test page

    Navigate to this page in the browser you want to test. For the most accurate results close other tabs and stop background video or GPU-intensive applications.

  2. Start the measurement

    Click Start. The tool begins counting frames using requestAnimationFrame and records the precise time between each frame delivery.

  3. Wait for stabilisation

    Let the test run for at least 2–3 seconds to stabilise. The detected Hz and frame time graph update in real time as data accumulates.

  4. Read your refresh rate

    Check the large Hz readout for your detected refresh rate. Compare it to the reference badges (60, 75, 120, 144, 165, 240, 360 Hz) to identify your panel tier.

Monitor Refresh Rate Test FAQ

How does this refresh rate test work?
The tool uses the browser's requestAnimationFrame API to measure the timestamp between consecutive frames. By averaging intervals over a short window, it calculates how many frames per second your monitor is actually rendering — your effective refresh rate in the browser.

Why does it show 60 Hz when my monitor is rated 144 Hz?
The most common causes: your display cable (HDMI 1.4 caps at 60 Hz at 1080p — use DisplayPort or HDMI 2.0+), your OS refresh rate is set to 60 Hz in display settings, or VSync in your graphics driver is capping output. Check your display settings and cable spec first.

Does this work on mobile devices?
Yes. Modern phones and tablets report accurate frame timing via requestAnimationFrame. Many flagship Android and iOS devices run at 90 Hz, 120 Hz, or 144 Hz — this test detects whatever rate the browser is currently rendering at.

Is my data sent to a server?
No. The entire measurement runs in JavaScript in your browser. No frame data, timestamps, or results are transmitted anywhere.

What is a good refresh rate for gaming?
60 Hz is the baseline for casual gaming. 144 Hz is the competitive sweet spot — it delivers noticeably smoother motion and lower perceived input lag. 240 Hz and 360 Hz offer diminishing but real improvements in fast-paced FPS games where frames are won or lost in milliseconds.

How do I enable 144 Hz or 165 Hz on my monitor?
Right-click the Windows desktop → Display settings → Advanced display → choose your monitor's maximum rate from the refresh rate dropdown. On macOS, go to System Settings → Displays and select the rate. Ensure you're using a cable that supports high refresh (DisplayPort 1.2+ or HDMI 2.0+).

What causes a lower-than-expected refresh rate result?
Browser compositing, VSync settings, GPU throttling, battery-saving mode on laptops, background processes, and hardware acceleration being disabled can all cause lower measured rates. Run in fullscreen with hardware acceleration enabled for the most accurate reading.

What is the difference between Hz and FPS?
Hz (refresh rate) is how often your monitor physically refreshes its display panel — a hardware property. FPS (frames per second) is how many frames your GPU renders and delivers. When FPS exceeds your Hz, frames are wasted. When FPS falls below Hz, you see repeated frames. They're the same unit but from different sources.

Background

Find out your monitor's actual refresh rate with this free browser-based test that counts real rendered frames — not just your display's rated spec. Using requestAnimationFrame, the tool measures the interval between consecutive frames and calculates how many frames your browser actually delivers per second.

A real-time frame time graph shows rendering consistency, and a motion smoothness strip lets you visually confirm how fluid your display is. Common refresh rates — 60 Hz, 75 Hz, 120 Hz, 144 Hz, 165 Hz, 240 Hz, 360 Hz — display as reference badges so you can instantly identify which tier your panel operates at.

Useful for verifying whether your monitor's advertised refresh rate is actually active (e.g. confirming 144 Hz is enabled in display settings, not capped at 60 Hz by HDMI cable limitations or OS settings). Everything runs client-side — no downloads, no installs, and no data sent anywhere.

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Monitor Refresh Rates Explained: 60Hz vs 144Hz vs 240Hz vs 360Hz

Frame time math for 60Hz to 360Hz monitors with real diminishing returns data. 144Hz cuts frame time by 10ms over 60Hz, and here's what matters for gaming.