Read Display Density Without Confusing It with Size
Two screens can have the same pixel count but different physical dimensions.
Resolution and physical size are separate
Two screens can have the same pixel count but different physical dimensions. The smaller one packs those pixels more closely and therefore has a higher PPI. Resolution alone does not describe how large a pixel appears.
Measure the active diagonal
Use the diagonal across the visible display area, in inches. Including the bezel or enclosure makes the entered size too large and lowers the calculated density. Check the manufacturer’s active-screen specification if you cannot measure it directly.
Treat scaling as another setting
Operating-system scaling changes how large interface elements are drawn. It does not change the panel’s physical pixel density. Compare the hardware result separately from a browser zoom level or a desktop scaling percentage.
Keep viewing conditions in the decision
PPI is a useful description, not a complete quality score. Distance, text size, eyesight, panel characteristics and intended work affect comfort. This tool calculates geometry rather than recommending a particular device.
Put it into practice
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Reduce image dimensions to an aspect ratio and find a proportional height for a new width.
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Estimate a display’s pixels per inch from its resolution and active-screen diagonal.
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