4:5 Aspect Ratio Calculator
CalculatorUnderstanding the 4:5 Proportion
The 4:5 (0.80:1) portrait aspect ratio is the top choice for Instagram feed photography, capturing 25% more screen area than standard square posts.
aspect-ratio: 4 / 5;padding-top: 125.00%;Common 4:5 Resolutions in Pixels
The table below outlines standard industrial resolutions that conform strictly to the 4:5 aspect ratio, including total pixel counts and target display hardware.
| Standard / Format | Dimensions (W × H) | Total Pixels | Megapixels | Common Hardware & Uses |
|---|---|---|---|---|
| Ultra HD Portrait (4K vertical crop) | 2160 × 2700 | 5,832,000 | 5.83 MP | High-res master exports, fine art social showcases |
| Instagram Portrait Standard | 1080 × 1350 | 1,458,000 | 1.46 MP | Instagram feed posts, Facebook mobile photo ads, LinkedIn portrait |
| Medium Portrait Web | 864 × 1080 | 933,120 | 0.93 MP | Mobile e-commerce product models, editorial fashion lookbooks |
| Preview Thumbnail | 432 × 540 | 233,280 | 0.23 MP | Mobile search feed previews, cached gallery cards |
Where is 4:5 Used?
Instagram Portrait Feed Posts (Maximum Screen Real Estate)
4:5 is the tallest allowable aspect ratio in the standard Instagram feed. A 1080×1350 post occupies 25% more vertical screen space than a 1:1 square, driving higher scroll-stop rates.
Fashion & Portrait Photography
Human bodies and full-length editorial fashion shots fit naturally within a 4:5 vertical rectangle, avoiding the harsh horizontal cropping required by 1:1 or 16:9.
Facebook Mobile Feed Advertising
Meta’s ad delivery algorithm prioritizes 4:5 image creatives on mobile feeds because they seamlessly fill the user’s thumb swipe view without triggering full-screen story mode.
E-Commerce Apparel Showcases
Online clothing boutiques utilize 4:5 cards in product listings to show footwear, dresses, and jackets from head to toe in sharp detail.
Production Tips for 4:5 Assets
- Keep vital text and branding inside the center 1080×1080 area so your post previews gracefully when cropped into the 1:1 profile grid.
- Export 4:5 photos as sRGB JPEG with 80–85% compression quality to prevent Instagram’s compression engine from introducing color banding.
- In CSS, use `aspect-ratio: 4 / 5;` with `width: 100%; height: auto;` for responsive mobile fashion galleries.
Frequently Asked Questions
Why do creators prefer 4:5 over 1:1 on Instagram?
4:5 (1080×1350px) takes up significantly more physical pixels on smartphone screens than 1:1 (1080×1080px). Users must scroll further past your post, increasing view duration and engagement.
How do I calculate height from width in 4:5?
Multiply width by 5 and divide by 4 (or multiply width by 1.25). For example, for a width of 1080 pixels: (1080 × 5) ÷ 4 = 1350 pixels.
What is 4:5 in decimal format?
4 divided by 5 equals exactly 0.80:1. It is a portrait orientation where height exceeds width.
What is the padding-top percentage for 4:5 in CSS?
Dividing 5 by 4 gives 1.25, so the padding-top percentage is exactly 125%. In modern CSS, declare `aspect-ratio: 4 / 5;`.