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Screen Pixel Density Calculator

Calculate PPI and physical size from resolution and diagonal.

Tool inputs stay in your browser · optional AI search sends your query

Good to know: PPI = diagonal pixel count ÷ physical diagonal inches. Assumes a flat rectangular screen with square pixels. Does not determine CSS devicePixelRatio or actual browser rendering scale.

How to use it (step by step)

  1. 1Fill in the boxes: “Horizontal pixels”, “Vertical pixels”, “Diagonal (inches)”. Example numbers are already there so you can see how it works; replace them with yours.
  2. 2The result updates instantly as you type (on a phone it is below the boxes).
  3. 3The bold line is the main answer. Tap Copy next to any value to copy it.

Words to know

Resolution / pixels
A picture is made of tiny dots called pixels. 1080×1920 means 1,080 dots wide and 1,920 tall.
Fraction / ratio
A fraction is a part of a whole (3/4 = three of four parts). A ratio compares two amounts (2:1 = twice as much).
CSS
The code that controls how a web page looks: colors, sizes, spacing and layout.

More in Design & Color

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