Ratio Guides

Explore the most useful aspect ratios for video, design, and responsive media

Use this index to jump into dedicated guides for widescreen, square, vertical, legacy, and ultrawide aspect ratios. Each page explains the math, common resolutions, ideal use cases, and quick size references.

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Start with the ratio that matches your destination platform

The right ratio depends on where the asset will live. Standard video and presentation work usually begins with 16:9, while square, vertical, legacy, or cinematic formats often perform better in narrower distribution channels.

16:9

16:9 Aspect Ratio Calculator

Calculate 16:9 dimensions, common resolutions, CSS percentages, and scaling examples for video and web layouts.

YouTube videosPresentation slidesDesktop hero banners

4:3

4:3 Aspect Ratio Calculator

Work out 4:3 widths and heights for slides, tutorials, retro content, and camera workflows.

Slides and decksOld video archivesTutorial recordings

1:1

1:1 Aspect Ratio Calculator

Generate perfect square dimensions for avatars, social posts, tiles, and image placeholders.

Instagram grid postsProfile imagesProduct thumbnails

4:5

4:5 Aspect Ratio Calculator

Calculate 4:5 portrait dimensions for Instagram feed posts, product photography, and editorial crops.

Instagram portrait postsProduct imageryEditorial portraits

9:16

9:16 Aspect Ratio Calculator

Calculate 9:16 vertical video sizes for TikTok, Instagram Reels, Shorts, and mobile-first creatives.

TikTokInstagram ReelsYouTube Shorts

3:2

3:2 Aspect Ratio Calculator

Calculate 3:2 dimensions for camera images, 35mm film workflows, 4x6 prints, and responsive photography layouts.

Photography4x6 printsCamera originals

21:9

21:9 Aspect Ratio Calculator

Find 21:9 ultrawide dimensions for cinematic edits, widescreen presentations, and monitor layouts.

Ultrawide monitorsCinema editsImmersive banners