Aspect Ratio Calculator

Resize an image or video without squashing it. Enter the original width and height, then type either a new width or a new height — the other updates to keep the same proportions. It also shows the simplified ratio (like 16:9).

Original width Original height

Ratio: 16:9

New width New height

Type in new width to get the matching height, or type in new height to get the width. Clear one to recalculate from the other.

Common ratios

16:9 — video, YouTube, most screens.
1:1 — square (Instagram posts, profile images).
4:5 — Instagram portrait; 9:16 — Reels/TikTok/Stories.
1.91:1 — link preview / Open Graph images.

Then shrink the file with the image compressor, or make social images with the Open Graph generator.