Why does my ratio show large numbers instead of something like 16:9?

The calculator shows the mathematically exact simplified ratio. If your dimensions don\u2019t divide evenly into a common ratio (e.g. 1921\u00d71080), the GCD is 1 and you get 1921:1080. Round to the nearest standard resolution for a cleaner ratio.

What aspect ratio should I use for social media?

Instagram posts work best at 1:1 (square) or 4:5 (portrait). Stories and Reels use 9:16. YouTube thumbnails are 16:9. Twitter/X in-feed images perform well at 16:9 or 2:1. The presets panel has all of these ready to select.

Aspect Ratio Calculator

About Aspect Ratio Calculator

Calculates the simplified aspect ratio from any width and height. Lock a ratio to auto-calculate the missing dimension when you change the other. Includes presets for common ratios (16:9, 4:3, 21:9, 1:1, 9:16) and resolution references for HD through 4K and social media formats.

Uses Euclidean GCD algorithm to simplify ratios to their lowest terms (e.g. 1920\u00d71080 \u2192 16:9)
Lock mode constrains dimensions to the current ratio \u2014 change width, height auto-adjusts, and vice versa
Visual preview box scales proportionally so you can see the shape at a glance
Shows total pixel count and megapixels for camera/print reference

Frequently Asked Questions

Why does my ratio show large numbers instead of something like 16:9?: The calculator shows the mathematically exact simplified ratio. If your dimensions don\u2019t divide evenly into a common ratio (e.g. 1921\u00d71080), the GCD is 1 and you get 1921:1080. Round to the nearest standard resolution for a cleaner ratio.
What aspect ratio should I use for social media?: Instagram posts work best at 1:1 (square) or 4:5 (portrait). Stories and Reels use 9:16. YouTube thumbnails are 16:9. Twitter/X in-feed images perform well at 16:9 or 2:1. The presets panel has all of these ready to select.

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