Aspect Ratio Calculator

Qu’est-ce que Aspect Ratio Calculator ?

Aspect ratio describes the proportional relationship between width and height. It is the magic number behind "why does this photo look squished?" and "what resolution do I need for an Instagram Reel?".

Enter any two dimensions and the tool reduces them to their simplest ratio (e.g. 1920×1080 → 16:9). You can then resize to a target width, fit inside a maximum box, or look up common preset ratios for social media, print, and video.

Comment l’utiliser

1. 1

   Enter width and height

   In any unit — pixels, mm, inches. The ratio is unitless.

2. 2

   Read the reduced ratio

   The tool uses the GCD of width and height to show the cleanest form.

3. 3

   Resize or fit

   Pick a target width or max bounds to see the new dimensions.

Exemples

Questions fréquentes

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