Monitor size (estimate)

    Estimate physical screen size from resolution and PPI. Results depend on browser zoom, OS scaling, and how closely you match a real ISO-standard card. Treat every number as an approximation, not a tape measure.

    Disclaimer

    Credit-card calibration assumes a 3.375" x 2.125" card (ISO/IEC 7810 ID-1). Thicker cases, parallax, or non-100% zoom will skew PPI. The default 96 x devicePixelRatio shortcut is only a rough starting point.

    Rough estimate (default PPI)

    Shown before calibration. Useful for order-of-magnitude only.

    Estimated physical pixels are unavailable. Open the page directly in your browser rather than inside an embedded preview.