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This PPI calculator determines display resolution from dimensions and pixel count. It teaches what PPI is, explores PPI vs DPI differences via DPI definition, and has comments on dot pitch definition and its usage decline. It shows how to calculate PPI and categorize resolution based on PPI. PPI (Pixels Per Inch) measures pixel density of a screen or digital image as the number of pixels on a 1-inch line, with screens and images having generally the same density along two main axes.

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