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Aspect Ratio Calculator

Set a ratio and one dimension to get the other — perfect for resizing video, images and thumbnails without stretching.

How to use the Aspect Ratio Calculator

  1. Set the ratio (e.g. 16:9).
  2. Enter a width or height.
  3. Get the matching dimension.

100% free, no sign-up, and it all runs in your browser — your data never leaves your device.

FAQ

What ratio is widescreen?

16:9 is standard widescreen video; 1:1 is square; 9:16 is vertical (Reels/Shorts/TikTok).

Add this tool to your website — free

Paste this where you want the tool to appear. It links back to ToolKraken.

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