4:5 Aspect Ratio: Sizes in Pixels and Uses

Where 4:5 comes from

4:5 is the tallest shape Instagram accepted in the feed for most of its history, so it became the default for anyone who wanted the most vertical space a single photo could occupy. That ceiling moved: since 29 May 2025 Instagram accepts 3:4 for single photos and carousels. 4:5 remains the shape most scheduling tools, ad templates and design presets are built around, which is why it is still the most searched of all of them.

Which platforms use 4:5

Read live from the specification data, so this list changes when a platform does. Last verified 2026-07-27.

Every image size on PixelSpec with a 4:5 aspect ratio
Platform	Asset	Size (px)	Source
Instagram	Post (portrait)	1080 x 1350	Convention
Instagram	Portrait post	1080 x 1350	Convention
Instagram	Carousel	1080 x 1350	Convention
Instagram	Feed ad image	1440 x 1800	Convention
Facebook	Feed ad image	1440 x 1800	Convention
Threads	Post image	1080 x 1350	Convention

4:5 sizes with their own page

One 4:5 dimension has a page of its own, with the arithmetic, the swapped size and a resizer preloaded to the exact pixels.

4:5 in pixels

Every row below is calculated from the ratio rather than looked up, so the heights are exact where the arithmetic is exact and rounded to the nearest whole pixel where it is not. A fractional pixel is not something a file can store.

Common pixel dimensions at 4:5
Width	Height	Used by
1080 px	1350 px	Instagram post (portrait), Instagram portrait post, Instagram carousel, Threads post image
1200 px	1500 px	-
1440 px	1800 px	Instagram feed ad image, Facebook feed ad image
1920 px	2400 px	-

Cropping and letterboxing into 4:5

A landscape source cropped to 4:5 loses a lot from the sides, because you are asking a wide frame to become a tall one. If the subject is off-centre, crop by hand rather than letting a centre crop decide.

There are only two honest ways to put an image of one shape into a frame of another. Crop to fill keeps the frame full and throws away whatever does not fit, which is almost always what you want for a feed. Fit inside keeps the whole image and pads the remaining space, which is what you want when the image is a diagram, a screenshot or anything where losing an edge loses meaning. Scaling to fit without doing either, so the image is stretched, is the one option that is always wrong.

Work out a 4:5 size

Enter a width or a height and the calculator solves the other side. It runs in your browser and nothing is uploaded.

Ratio widthRatio height

Common ratios

Width (px)Height (px)

Type in either the width or the height and the other side solves to keep the ratio.

4:5 at 1080 px wide

1080 x 1350px

The height is 1350 px.

height = 1080 x 5 / 4 = 1350 px.

Ratio: 4:5
Decimal: 0.8
Result ratio: 4:5

Questions about 4:5

How tall is a 4:5 image at 1080 pixels wide?

1350 pixels. Multiply the width by 5 and divide by 4: 1080 x 5 / 4 = 1350. Going the other way, multiply the height by 4 and divide by 5.

Is 9:16 the same as 4:5?

No. Both are portrait, but 9 / 16 = 0.5625 while 4 / 5 = 0.8, so 9:16 is much taller and narrower. At 1080 px wide, 9:16 is 1920 px tall and 4:5 is 1350 px tall. Cropping a 9:16 image to fill a 4:5 frame keeps 1350 of its 1920 px of height, about 70 percent.

Is 4:5 the same as 3:4?

No, though they are close. 4 / 5 = 0.8 and 3 / 4 = 0.75, so 3:4 is slightly taller. At 1080 px wide, 4:5 is 1350 px tall and 3:4 is 1440 px tall, 90 px more. That gap is why a 4:5 post loses a thin slice from each side in a 3:4 profile grid tile.

Other ratios

See the aspect ratio guide for the shapes side by side, or the full cheat sheet for every size on one page.