Free Monitor Refresh Rate Test — Check Your Hz, FPS & Frame Time

The tool uses requestAnimationFrame to time how often your browser paints a new frame. It measures the gap between hundreds of frames, takes the median to find the frame interval, and converts it to Hz. It then reports live FPS, frame time, jitter, confidence and dropped frames so you can see how stable that rate is.

Your display is not running at its maximum refresh rate. Windows often defaults new monitors to 60Hz. Set it under Settings > Display > Advanced display > Choose a refresh rate. A cable that is too slow (HDMI 1.

60Hz is fine for office work and video. 144Hz is the sweet spot for competitive gaming and is clearly smoother than 60Hz. 240Hz and above give smaller gains that mainly matter to esports players. Anything from 120Hz up will feel noticeably more fluid for fast motion and aiming.

Browser frame timing has tiny variations, so the raw measurement is rarely a perfect whole number. The tool snaps values that are within a few percent of a standard rate (60, 120, 144, 165, 240, etc.). A result of 143 or 59 simply reflects normal timing jitter, not a hardware fault.

Often yes. Some browsers limit a windowed or background tab to 60fps and remove that cap in fullscreen. Fullscreen also reduces browser UI rendering overhead, which lowers jitter and raises the confidence score. For the most accurate reading, close other apps, run the test in fullscreen, and keep the tab focused.

Jitter is how much the time between frames varies — lower is more stable. Confidence is how tightly the frames cluster around the detected rate, shown as a percentage. Dropped (or skipped) frames are intervals that took roughly twice as long as expected, meaning the browser missed a refresh.