4:5 Aspect Ratio Calculator
Use this 4:5 aspect ratio guide to understand portrait post dimensions, common Instagram resolutions, and how to convert sizes for social media feeds.
What is 4:5?
4:5 is a portrait aspect ratio that is slightly taller than a square but not as tall as a full vertical screen. It is best known as the optimal aspect ratio for Instagram and Facebook feed posts. Because it takes up maximum vertical space in the feed without getting cropped, 4:5 ensures your photos and videos get the most screen real estate possible.
Common 4:5 resolutions
- 800×1000
- 1080×1350
- 1200×1500
- 1440×1800
Where 4:5 is used
- Instagram feed posts (photos and videos)
- Facebook feed posts
- Social media carousels
- Digital portrait photography
- Print products (8×10 photos)
How to calculate 4:5 dimensions
To calculate 4:5 dimensions, the height must be 1.25 times the width. For example, if your width is 1080 (the standard for Instagram), your height should be 1350. If your width is 800, your height is 1000. Our calculator lets you enter one side and instantly find the matching dimension.
4:5 vs other common aspect ratios
Compared with 1:1 (square), 4:5 gives you 25% more vertical space in social media feeds. Compared with 9:16 (full vertical), 4:5 is shorter and designed specifically for scrollable feeds rather than full-screen immersive video.
If you want to maximize visibility on Instagram and Facebook without your content getting cut off in the feed, 4:5 is the best choice.
Frequently asked questions
What is 4:5?
4:5 is a portrait aspect ratio commonly used for social media feed posts, especially on Instagram and Facebook, as well as traditional 8×10 photography prints.
What is the best 4:5 resolution for Instagram?
1080×1350 is the optimal 4:5 resolution for Instagram feed posts, providing the highest quality without being compressed or cropped.
Is 4:5 better than 1:1 on social media?
Generally, yes. 4:5 takes up more vertical space in the user's feed than 1:1 (square), meaning your content is on screen longer as they scroll.
Can I use 4:5 for video?
Yes! 4:5 is excellent for feed videos on Instagram and Facebook, though full-screen video formats like Reels usually require 9:16.