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Screen size & PPI calculator

Pixel density (PPI), dot pitch and the real width and height of a screen from its resolution and diagonal.

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Pixel density 163.2 PPI

How it works

PPI = √(w² + h²) ÷ diagonal

Pixel density is the number of pixels along the diagonal divided by the diagonal length in inches. A 27-inch 4K monitor has about 163 PPI; a 27-inch 1440p one about 109. The physical width and height follow from the aspect ratio: a 16:9 screen’s width is the diagonal × 16 ÷ √(16² + 9²).

  1. Pixels along the diagonal √(3,840² + 2,160²) = 4,405.814
  2. ÷ diagonal in inches 4,405.814 ÷ 27 = 163.2 PPI

Printed from rocketcalc.io/computing/screen-ppi