3:4 Aspect Ratio Calculator
Working with tall portrait images? Enter the width or height in pixels below and this 3:4 aspect ratio calculator finds the matching dimension, including the 1080x1440 size used for Instagram tall posts.
What is the 3:4 Aspect Ratio?
The 3:4 aspect ratio is a portrait rectangle with a width-to-height relationship of 3 to 4 (0.75:1). It is simply the classic 4:3 shape turned on its side: instead of wider than tall, it is taller than wide.
You will find 3:4 on tablet screens held upright, in tall Instagram posts, and in photo prints like 6 x 8 inches. It is one of the tallest shapes allowed in a social feed before a post becomes a full-screen Story.
Common 3:4 Resolutions
These are the most common 3:4 pixel sizes:
- 480 x 640 (small portrait)
- 600 x 800 (classic web portrait)
- 768 x 1024 (iPad portrait)
- 900 x 1200 (slide portrait)
- 1080 x 1440 (Instagram tall post)
- 1200 x 1600 (high-res portrait)
- 1536 x 2048 (iPad HiDPI portrait)
- 2160 x 2880 (print quality)
For social media the key size is 1080 x 1440 pixels, Instagram's tallest feed ratio.
Where You See 3:4
- Tablets in portrait: iPad screens use 4:3, so held upright that is 768 x 1024 or 1536 x 2048 (3:4).
- Instagram tall posts: 1080 x 1440 pixels, the tallest ratio the feed allows.
- Photo prints: 6 x 8 and 9 x 12 inch prints are exact 3:4 shapes.
- E-readers and digital frames: Many devices designed for reading or showing photos use close to a 3:4 shape.
3:4 FAQ
What is 3:4 in pixels?
Any size where the height is 1.33 times the width is 3:4, including 480 x 640, 768 x 1024 and 1080 x 1440.
What size is a 3:4 Instagram post?
Instagram uses 1080 x 1440 pixels for 3:4 tall posts, the tallest ratio allowed in the feed.
Is 3:4 the same as 4:3?
They are the same shape in different orientations: 4:3 is landscape and 3:4 is portrait, like a photo taken in landscape versus portrait mode.
Is a 6x8 print 3:4?
Yes. 6 x 8 inches simplifies to 3:4, and so do 9 x 12 and 12 x 16 prints.