Aspect Ratio X is a rule-of-three calculator.

Features
– Calculate aspect ratios (rule of three)
– Swap values horizontally and vertically
– Select scales and ratios
– Browse common resolutions
– Browse recent ratios
– Formula preview
– Uses imperial or metric system automatically based on your system settings
– Multi-window support
– Optimized for macOS 11 (Big Sur) and macOS 12 (Monterey)
– Optimized for Mac with M1, M1 Pro and M1 Max (Apple Silicon)

An app ahead:
If you like the app, please take a moment to rate it on the Mac App Store. That’s a great way to support indie developers like me. If you need help or want to make a feature suggestion, reach out any time: [email protected]. I’d love hearing from you!