Aspect Ratio Calculator
Convert width and height into ratios like 1:1, 4:5, and 9:16 used by social platforms.
What this tool does
Aspect ratio mistakes create letterboxing, stretched faces, and UI collisions. This free calculator helps you translate relationships like 9:16, 4:5, and 16:9 into exact pixel targets before you design or export.
Plan the ratio first, then design. Fixing ratio after a full design pass usually means cropping something important.
How to use it
- 1
Enter width and height in pixels.
- 2
View the simplified aspect ratio (e.g. 16:9).
- 3
Click a social media preset to load standard dimensions.
Ratios creators use constantly
9:16 for Stories, Reels, TikTok, Shorts. 4:5 for Instagram feed portraits. 1:1 for square grids and many product shots. 16:9 for YouTube thumbnails and horizontal video. Knowing these by heart saves time; the calculator catches edge cases and custom sizes.
Safe zones differ even when the ratio matches. Keep text away from edges on vertical video. Faces should sit center-weighted when circular profile crops are involved.
Workflow with the image resizer
Calculate the pixel pair you need, design or shoot with that framing, then resize/export with the image resizer. If you inherit a wrong-ratio asset, calculate the crop you can live with before you destroy the subject.
Common mistakes
Confusing orientation (portrait vs landscape) with ratio labels. Designing at 1080×1920 then exporting a square crop without checking. Assuming all “vertical” platforms share identical safe margins.
Tips
- Save a preset list of your brand’s required sizes.
- Check image dimension checker after export when clients are picky.
- Read the image sizes guide when training a new teammate.
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Frequently asked questions
What aspect ratio is Instagram Reels?▼
9:16 vertical (1080×1920 px).
What is YouTube thumbnail size?▼
1280×720 px (16:9 aspect ratio).