PPI & DPI Screen Pixel Density
Everyday & OtherCalculate screen Pixels Per Inch (PPI), dot pitch (mm), total megapixels, and display sharpness from pixel resolution (width × height) and diagonal screen size in inches.
Dot pitch: 0.2335 mm · Total pixels: 3.69 Megapixels
About this calculator
Pixel density determines how sharp and crisp text and images appear on digital monitors, smartphone displays, and laptop screens. Higher PPI values render smooth, imperceptible pixels at standard viewing distances (Retina displays).
This tool calculates diagonal pixel count via the Pythagorean theorem, divides by diagonal inches to find PPI, and computes horizontal/vertical dot pitch spacing in millimeters.
How It Works & Formula
Diagonal Pixels d_p = √(Width² + Height²). PPI = d_p / Diagonal Size (inches). Dot Pitch (mm) = 25.4 / PPI. Total Megapixels = (Width × Height) / 1,000,000.
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