Aspect Ratio Calculator
Calculate the correct crop or export dimensions for any aspect ratio — free and instant.
Introduction
Getting a crop or export exactly right for a target aspect ratio means either doing the math by hand or guessing and checking in your editor. This tool does both directions of that math instantly — tell it what you have, or tell it what ratio you need and one known dimension.
How the Tool Works
Use Find My Ratio to enter a width and height and see the simplified ratio (e.g. an image at 1080×1350 simplifies to 4:5). Use Calculate a Dimension to pick a target ratio preset and one known dimension — the tool works out the exact matching width or height.
Calculate Your Ratio
Common Ratios to Know
- 1:1 — Instagram square feed posts, profile pictures.
- 4:5 — Instagram portrait feed posts (takes up more vertical screen space than square).
- 9:16 — Instagram/TikTok Stories and Reels, YouTube Shorts.
- 16:9 — YouTube standard video, most landscape presentations.
Frequently Asked Questions
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