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Refresh Rate Test — Check Your Monitor Hz & FPS Online

Measure your display refresh rate and rendered frame rate.

Measures your actual display refresh rate using requestAnimationFrame.

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Refresh Rate
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Current FPS
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Frames Counted
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Duration (s)
Click "Test Again" to measure your refresh rate.

How it works

How to measure your display refresh rate

Click Test Again to run a 2-second measurement. The tool uses your browser's requestAnimationFrame API, which is synchronized with your display's vertical refresh (v-sync). It counts how many times the screen refreshes over the measurement window and calculates the effective refresh rate in Hz. A real-time FPS counter updates while the test runs.

For the most accurate reading, close background applications, disable GPU power saving features, and run the test with the browser window in focus on your primary display. If you have multiple monitors connected, drag the window to the display you want to test.

Understanding your results

Standard refresh rates

Most office and laptop displays run at 60 Hz. Gaming monitors typically run at 120 Hz, 144 Hz, 165 Hz, or 240 Hz. Some high-end monitors reach 360 Hz or even 500 Hz. If your result is slightly below the advertised rate (e.g., 59.9 Hz instead of 60 Hz), that is normal measurement variance.

Why results may be lower than expected

Your monitor may be running at a lower refresh rate than you paid for. Check your OS display settings to confirm the selected refresh rate. HDMI cables older than 2.0 may limit bandwidth at higher resolutions. On laptops, battery saver mode sometimes caps the refresh rate to conserve power.

Variable refresh rate (VRR / G-Sync / FreeSync)

This tool measures the current refresh rate. If VRR is active and no motion is on screen, the refresh rate may drop below maximum. That is normal — VRR lowers the rate when frames are static to save power and reduce tearing.

Refresh rate vs. FPS — why both matter

Refresh rate is a hardware specification of your display. FPS is a measure of rendering performance. A 144 Hz display can only show 144 FPS at most; anything above that is wasted (or causes screen tearing if v-sync is off). Conversely, even the best 240 Hz screen will look choppy if your GPU can only deliver 40 FPS. Both numbers need to be high for smooth motion.

Related tools

Frequently Asked Questions

What is the difference between refresh rate and FPS? expand_more
Refresh rate (Hz) is how many times your display hardware updates the image per second. FPS (frames per second) is how many frames your GPU or browser can render each second. A 60 Hz display shows at most 60 FPS no matter how many frames the GPU produces. A high refresh rate display (120 Hz, 144 Hz, 240 Hz) can show more frames for smoother motion.
Why does my monitor advertise 144 Hz but the test shows less? expand_more
Several factors can lower the effective refresh rate: the cable (HDMI 1.4 may cap at 120 Hz at certain resolutions), the port (some laptop USB-C ports limit bandwidth), or power saving features. Make sure you have set the correct refresh rate in your OS display settings and are using a quality cable.
Can a browser accurately measure refresh rate? expand_more
Yes, within limits. Modern browsers use requestAnimationFrame which is synchronized with the display v-sync, making it a reliable way to count screen refreshes. The measurement is accurate to within about ±1 Hz on most systems. Browser throttling in background tabs can affect results.
Is a higher refresh rate always better? expand_more
Higher refresh rates provide smoother motion and lower perceived latency, which is especially noticeable in gaming and fast scrolling. The difference between 60 Hz and 120 Hz is significant; the gain from 120 Hz to 240 Hz is more subtle. For office work and video, 60 Hz is perfectly adequate.
Does the FPS counter show my GPU performance? expand_more
The FPS counter reflects browser rendering performance, which is typically GPU-accelerated but also depends on CPU, drivers, and page complexity. For a true GPU benchmark, try a dedicated WebGL stress test. This tool primarily measures the display refresh rate, not raw GPU power.