Device checks / Display
Refresh Rate Test: Check Your Monitor's Hz
Measure the refresh rate your screen is really running at, such as 60, 120, 144, or 240 Hz, see the frame time and dropped frames, and watch a moving shape at an adjustable speed for motion blur and ghosting.
Refresh Rate Test: Check Your Monitor's Hz: The browser draws a new frame on every screen refresh, so the page times those frames, takes the median interval while ignoring dropped frames, and converts it to hertz, rounded to the nearest common rate. At 144 Hz each frame lasts 6.94 ms. The strip below moves a shape by a set number of pixels per second for checking motion clarity. Runs 100% locally in your browser with zero server file uploads.
- Category
- Everyday tools
- Runs
- In your browser
- Cost
- Free · no sign-up
- Availability
- Ready to use
Runs entirely in your browser
The browser draws a frame each time the screen refreshes, so timing the frames gives the refresh rate; it is rounded to the nearest common rate such as 60, 120, 144, or 240 Hz. If it reads 60 on a faster monitor, check the display settings, the cable (some HDMI cables cap the rate), and the browser's power saving. Watch the moving shape for blur and ghosting: the higher the refresh rate and the faster the panel, the sharper it stays.
Frame times
60 Hz is 16.7 ms per frame, 120 Hz 8.3 ms, 144 Hz 6.9 ms, 240 Hz 4.2 ms. Games feel smoother at higher rates only if the computer can render that many frames.
Laptops and power saving
Many laptops drop to 60 Hz on battery to save power, and some phones lower their rate when the screen is still; plug in and keep the page moving for a full reading.
How to use it
- Open the page on the screen you want to test and leave it in front.
- Wait a moment for the rate to settle.
- Watch the moving shape, and change its speed to judge blur.
Privacy & limitations
Measured in your browser.
Related tools
Frequently asked questions
Why does my 144 Hz monitor show 60 Hz?
The display may be set to 60 Hz in the operating system, the cable or port may not support the higher rate, or the browser may be limited by power saving or a second screen.
Is the number exact?
Close: frame timing has a little jitter, so the measured value is rounded to the nearest standard rate.
What is ghosting?
A faint trail behind moving objects, from pixels that change colour too slowly; it is a panel limit, separate from the refresh rate.
Free tool · runs in your browser · no account required