4:5 Aspect Ratio Calculator
4:5 is the portrait aspect ratio of Instagram feed posts. It is the tallest ratio allowed in the feed, occupying the most screen space while users scroll — which is why marketers prefer it over square.
Ratio locked to 4:5. Enter either side, get the other.
Enter a width or height above.
Common 4:5 sizes
| Pixels | Usage |
|---|---|
| 800×1000 | Small 4:5 |
| 1080×1350 | Instagram portrait post |
| 1600×2000 | Large 4:5 |
| 2048×2560 | High-res 4:5 |
Frequently asked questions
What size is an Instagram portrait post?
1080×1350 pixels, a 4:5 ratio. It is the maximum height allowed for feed photos and takes up significantly more screen space than a 1080×1080 square post.
Is 4:5 the same as 8:10?
Yes — both reduce to the same proportion. 8:10 is the photo-print naming, 4:5 is the digital naming; 1080×1350 satisfies both.
Does 4:5 get more engagement than square?
It occupies about 25% more vertical screen area in the feed, which increases visibility. Engagement ultimately depends on content, but the format maximizes your canvas.