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Pixel Density Calculator

Calculate PPI/DPI from screen resolution and diagonal size. Convert between @1x, @2x, @3x density scales. Includes common device presets. Runs entirely in your browser — your data never leaves your machine.

ppi dpi density retina resolution screen

Published May 30, 2026

All interactive tools run entirely in your browser. Your data never leaves your device.

How It Works

Enter a screen’s width, height (in pixels), and diagonal size (in inches) to calculate its pixel density (PPI/DPI). Use the density scale calculator to see asset sizes across @1x through @4x.

Features

  • PPI/DPI calculation: from resolution and diagonal screen size
  • Derived metrics: diagonal pixels, total pixels, megapixels, aspect ratio
  • Density scales: @1x (mdpi) through @4x (xxxhdpi) asset size calculator
  • Device presets: iPhone, iPad, MacBook, Samsung, Dell, Apple Studio Display
  • Clickable reference table: click any device to populate inputs
  • Aspect ratio: automatically simplified (e.g., 16:9, 4:3)
  • 5 examples: iPhone 15 Pro, MacBook Pro 14”, Full HD 24”, 4K 27”, Apple Studio Display
  • Private: runs entirely in the browser — no data transmitted

Use Cases

  • Determining if a display is truly “Retina” quality
  • Calculating asset sizes for multi-density mobile apps
  • Comparing screen specifications across devices
  • Planning responsive image sizes for different display densities