4:5 Aspect Ratio Calculator
Use this 4:5 aspect ratio guide to understand portrait feed dimensions, common 4:5 resolutions, and how to size content for Instagram and Facebook.
What is 4:5?
4:5 is a portrait aspect ratio designed for feed-based social content. It is one of the best formats for Instagram and Facebook posts because it uses more vertical space than square or widescreen images without becoming a full-screen story format. If your goal is to stand out in a mobile feed, 4:5 is usually a smart default.
Common 4:5 resolutions
- 1080×1350
- 1200×1500
- 1440×1800
- 2160×2700
Where 4:5 is used
- Instagram portrait feed posts
- Facebook portrait feed posts
- Social graphics designed for mobile feeds
- Portrait image posts with strong vertical framing
- Static social content where feed visibility matters
How to calculate 4:5 dimensions
To calculate 4:5 dimensions, keep the width-to-height relationship locked at 4 units wide for every 5 units high. For example, if your width is 1080, the matching height is 1350. If your height is 1500, the matching width is 1200. The calculator helps you convert these values instantly when you know one side of the design.
4:5 vs other common social ratios
Compared with 1:1, 4:5 is taller and takes up more of the mobile feed. Compared with 9:16 it is less immersive but more natural for feed posts that are not meant to be viewed as full-screen vertical video.
If you are designing a static or lightly animated social post for Instagram or Facebook, 4:5 is often the strongest default starting point.
Frequently asked questions
What is 4:5?
4:5 is a portrait aspect ratio commonly used for Instagram and Facebook feed posts because it takes up more vertical space on mobile screens than square or widescreen formats.
Is 1080×1350 a 4:5 resolution?
Yes. 1080×1350 simplifies to 4:5 and is one of the most common export sizes for Instagram portrait posts.
What is 4:5 used for?
4:5 is widely used for Instagram feed posts, Facebook portrait posts, and other social placements where vertical screen real estate matters.
What is the difference between 4:5 and 1:1?
4:5 is taller than 1:1, which means it takes up more room in a mobile feed and often performs better for portrait-oriented social content.