PPI calculator

Compute a display's pixel density, dot pitch, and aspect ratio from its resolution and size.

Calculated in this browser. Nothing is sent anywhere.

PPI is diagonal pixels ÷ diagonal inches — it describes sharpness, not size. Two panels with the same resolution but different diagonals get different PPI. Dot pitch is the pixel size in mm (25.4 ÷ PPI). Resolution up to 100,000 pixels per side, diagonal up to 500 inches. Advertised diagonals are nominal — check the spec sheet if you need exactness.

How to use

  1. Pick a preset or enter the resolution.
  2. Enter the diagonal in inches.
  3. Read the PPI and related figures.

What it supports

PPI = diagonal pixels ÷ diagonal inches — a sharpness figure, not a size. Advertised diagonals are nominal; up to 100,000 px per side and 500 inches.

Related tools

Related guides