ScreenPPI
Calculate

Resolution · diagonal · density

Calculate screen pixel density without guessing.

Enter native width, height and visible diagonal to get PPI, pitch and physical dimensions.

Formula and worked example

How to calculate screen PPI

PPI = √(width in pixels² + height in pixels²) ÷ diagonal in inches.

For 1920 × 1080 px on a 24-inch screen: the pixel diagonal is about 2202.90717 px, so the density is 91.787799 PPI.

Convert PPI to pixel pitch

Pixel pitch in millimeters = 25.4 ÷ PPI. At 91.787799 PPI, the pitch is about 0.276725 mm.

Resolution alone is not enough

Use the panel’s native pixel width and height plus its active visible diagonal. The same 1920 × 1080 resolution has a different PPI on screens with different diagonals; operating-system scaling does not change physical panel PPI.

The estimate assumes square pixels and an accurate active diagonal. It does not rate perceived sharpness, viewing distance, subpixel layout, printer DPI, or medical-display suitability.

Local exact inputs

Screen geometry

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Use the active visible panel diagonal and native pixel dimensions. This calculator does not rate image quality, viewing distance, eyesight, or medical-display suitability.

Calculated geometry

Screen density result

Pixel density108.785539 PPI42.828952 px/cm · 0.233487 mm
Physical size23.53254 × 13.237053 in
Metric size59.77265 × 33.622116 cm
Pixel diagonal2937.20956 px
Reduced aspect ratio16:9
Total pixels3686400
Megapixels3.6864 MP

√(2560² + 1440²) ÷ 27 in = 108.785539 PPI

Displayed derived values are rounded to six decimal places; entered whole pixel counts remain exact.