Aspect Ratio Calculator
Free aspect ratio calculator for video, images, displays, and social media. Calculate aspect ratio from resolution, convert dimensions, and preview common formats like 16:9, 9:16, 4:5, 1:1, and 21:9.
Aspect Ratio
16:9
Resolution
1920×1080
Display
Photo
Video
Social
16:9
What is an aspect ratio?
An aspect ratio is the proportional relationship between width and height. It is usually written like 16:9, 4:5, or 1:1. This calculator helps you simplify dimensions, convert ratios, and quickly preview how a format will look.
How to calculate aspect ratio
Enter a width and height to simplify a resolution into its ratio. For example, 1920×1080 becomes 16:9. You can also pick a preset ratio and calculate a missing width or height for video, images, displays, and social media.
Common aspect ratios
- 16:9 — standard video, monitors, TVs, YouTube
- 9:16 — vertical video, Stories, Reels, Shorts
- 1:1 — square posts, photos, avatars
- 4:5 — Instagram and Facebook portrait posts
- 21:9 — ultrawide displays
- 4:3 — legacy displays and presentations
Social media aspect ratios
- Instagram: 1:1, 4:5, 9:16
- YouTube: 16:9 thumbnails and video, 9:16 Shorts
- LinkedIn: 1.91:1 shares, 1:1 square posts, 4:1 banners
- Facebook: 4:5 posts, 1.91:1 link images, 9:16 Stories
- X: 16:9 image posts, 3:1 headers
Frequently asked questions
What is an aspect ratio?
An aspect ratio is the proportional relationship between width and height, written as values like 16:9, 4:5, or 1:1.
How do I calculate aspect ratio from width and height?
Take the width and height and simplify them to their smallest proportional values. For example, 1920×1080 simplifies to 16:9.
What is 1920×1080 as an aspect ratio?
1920×1080 simplifies to 16:9, which is the most common widescreen video and display format.
What is the best aspect ratio for Instagram?
The most common Instagram formats are 1:1 for square posts, 4:5 for portrait feed posts, and 9:16 for Stories and Reels.
What aspect ratio is YouTube Shorts?
YouTube Shorts use a 9:16 vertical aspect ratio, commonly exported at 1080×1920.
What is the difference between 16:9 and 9:16?
16:9 is a landscape widescreen format used for monitors, TVs, and standard video. 9:16 is the vertical version used for Stories, Reels, and Shorts.