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About What Is My Screen Size?

What Is My Screen Size? is a free browser tool that instantly shows your monitor's resolution, an estimated diagonal size in inches, aspect ratio, and device pixel ratio (DPR) — no download, no sign-up, no installation.

What you get

Your live screen resolution in pixels (width × height).
An estimated screen size in inches, based on your resolution and device pixel ratio.
Your display's aspect ratio, simplified (e.g. 16:9, 21:9).
Your device pixel ratio (DPR), which affects how sharp text and images appear.
Reference articles on resolution, PPI vs. DPI, common resolutions, and frequently asked questions.

How it works

Everything runs directly in your browser using standard, publicly available browser APIs (window.screen and window.devicePixelRatio). Nothing is uploaded or stored anywhere — refresh the page and it simply reads your display again.

Note: browsers don't expose the true physical size of a display, so the inch estimate is an approximation based on a standard 96 DPI baseline. High-DPI (Retina-style) displays and custom OS scaling can make the estimate less precise. For full details, see the Privacy Policy.

Who makes this

This is an independently run project. Suggestions, questions, or issues can be sent to suportewebmaster@proton.me.