Aspect Ratio X app icon

Aspect Ratio X

Rule of Three Calculator

Straightforward rule-of-three calculator


  • Calculate aspect ratios
  • Swap values horizontally and vertically
  • Select scales and ratios
  • Browse common resolutions
  • Browse recent ratios
  • Formula preview
  • Imperial and metric numbers support
  • Multi-window support
  • Optimized for macOS 11+
  • Optimized for Mac with M1 (Apple Silicon)


Version 2.1.8
Size MB
Compatibility macOS 11.0+
Version History