How does this tool measure my refresh rate?

It asks your browser for a new animation frame as fast as the browser allows, for about 3 seconds, and records the time of each frame. After skipping the first 5 frames it takes the median time between frames and converts it to Hz (1000 divided by the milliseconds). The measured value is shown with one decimal place, along with the closest common rate such as 60, 120 or 144 Hz.

Why does it say 60 Hz when my monitor is 144 Hz?

Either the monitor is not set to its top rate in your operating system display settings, the cable or port does not support it, or the browser or a power mode limits animation to 60 Hz. Battery saver is a common cause on laptops. Check your display settings, plug in the charger, close the other windows and press "Measure again".

What are late frames and dropped frames?

A late frame is one that took more than 1.5 times the median frame time. The tool also estimates how many whole frames were missed during those late frames. A few late frames are normal when the computer is busy. Many of them mean animation on this page is not running smoothly.

What does the moving pattern show?

It moves two bars across the screen at 480 and 1440 pixels per second, with the position calculated from the time of each frame. On a higher refresh rate screen the motion has more steps per second, so it looks smoother and less blurred. It is a way to judge smoothness by eye, not a measurement, and it stops while a measurement runs.

Can I get a wrong result?

Yes. A background tab, battery saver, a busy computer, several monitors with different rates, and variable refresh rate can all make the number lower or less steady than the screen's rating. If the measured value is not within 5 percent of a common rate, the tool says so instead of rounding. Close other programs and press "Measure again" to check.

Yes. Every tool is free to use, with no account and no credit card. The work runs on your device rather than on our servers, which is what keeps it free to run.

Does it work on mobile?

Yes. It runs in current mobile browsers on iOS and Android, with nothing to install.

🖥️

Free Refresh Rate Test

Find out your screen's real refresh rate in Hz, see how many frames are dropped, and compare smoothness with a moving test pattern.

Runs in your browserNo sign-up, no pop-upsNo login requiredFree foreverMeasured in HzDropped frame countSmoothness pattern

The page counts how often your browser can draw a new frame for about 3 seconds and works out your screen's refresh rate from the middle frame time. Keep this tab in front and leave the mouse still while it runs.

Measured refresh rate

Smoothness pattern

Watch the bars move. On a higher refresh rate screen the motion looks smoother and less blurred, and the fast bar is easier to follow.

Slow: 480 pixels per second

Fast: 1440 pixels per second

The position is calculated from the time of each frame, so it moves at the same speed on every screen. Only the number of steps per second changes. The pattern stops while a measurement runs.

Why the number can be lower than your screen's rating

Battery saver and low power modes can lower the refresh rate or limit animation to 30 or 60 Hz. Plug in the charger and turn them off to test the full rate.
Browsers slow or pause animation in a background tab or a minimised window, so measure with this tab in front.
With several monitors the browser follows the screen the window is on, and mixed refresh rates can behave differently. Move the window fully onto one screen and measure again.
Some browsers and operating systems cap animation at 60 Hz even on a faster screen. Also check that your display settings are set to the highest rate, and that the cable and port support it.
With variable refresh rate (G-Sync, FreeSync, ProMotion) the screen may change its rate while the page is mostly still, so the measured number can sit below the maximum.

🖥️ The measurement only counts frame times in this tab. Nothing is stored or uploaded.

How It Works

The page times how often your browser draws a frame and turns the median gap into a refresh rate.

1
Let it measure
When the page opens it counts animation frames for about 3 seconds. Keep this tab in front and the mouse still.
2
Read the rate
The measured Hz is shown with one decimal, plus the closest common rate such as 60, 120 or 144 Hz.
3
Check dropped frames
Late frames took more than 1.5 times the median frame time. The tool also estimates how many frames were missed.
4
Judge smoothness
Press "Start moving pattern" and watch the bars. Press "Measure again" after changing display or power settings.