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

– 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)

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What’s New

Version 2.1.2

I’ve made a number of minor improvements. Have anything else you’d like to suggest? I’d love to hear from you →

Ratings and Reviews

5.0 out of 5
2 Ratings

2 Ratings

Somps ,

This app works

Update 2018-7-14
I see that you can click on the “X” and then click on thr “A” “B” or “C” to switch the order.

This app quickly does the calcs as soon as you input the numbers. I’m not sure why they are showing screenshots of “Rule-of-three” and “Dreisatz”. Maybe they are sold in different markets. I have the Imperial one. Simple, clean, and easy.

App Privacy

The developer, IXEAU, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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