PPI Calculator — Calculate Pixel Density
Enter a screen's resolution and diagonal size to calculate its pixel density (PPI). Higher PPI means sharper text and images. Use the presets below for common configurations, or enter custom values.
Presets
Pixels Per Inch
Density Category
Total Pixels
Dot Pitch
How It Compares
How PPI Is Calculated
PPI (pixels per inch) measures how many pixels fit into one linear inch of screen. The formula is:
PPI = √(width² + height²) ÷ diagonal_inches For example, a 27-inch monitor at 2560 × 1440:
PPI = √(2560² + 1440²) ÷ 27 = √(6,553,600 + 2,073,600) ÷ 27 = 2,937.09 ÷ 27 ≈ 108.79 PPI