Aspect Ratio Calculator

How do I calculate aspect ratio?

How to use

  1. Enter your values in the fields above.
  2. Press Calculate to see your result instantly.
  3. Use the Share button to copy a link to your result.

About this calculator

This tool keeps a width-to-height ratio fixed while solving for a missing dimension — enter a known width and height plus a new width (or height), and it returns the matching value that preserves the same proportions, along with the ratio in its simplest form (like 16:9 or 4:3).

It is a staple for video editors and YouTubers resizing footage without distortion, designers cropping images or laying out responsive layouts, and anyone printing or resizing a photo who needs to know what height goes with a given width so nothing gets stretched or squashed.

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