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Aspect ratio calculator: what ratio is that, and what size at 1080?

Type any width and height to get the simplified ratio, its decimal form, and the nearest standard social media ratio. Then scale it: enter a new width and the matching height appears, or the other way round. Ten common ratios are one tap away with their usual pixel sizes.

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Your dimensions

Aspect ratio

4:5

1:1.25, portrait. Closest standard: 4:5.

Scale to a new size

Fill in one side; the other follows the same ratio.

1080 x 1350 keeps the 4:5 ratio.

Standard ratios

Tap one to load its most common pixel size.

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Aspect ratio guides

Common resolutions by ratio

1:1

Square posts, profile pictures, album art and carousel slides on every platform.

4:5

Portrait feed posts on Instagram, Facebook, LinkedIn and Threads.

5:4

Landscape twin of 4:5; 8 by 10 inch prints and the 1280 by 1024 monitor.

3:4

Instagram's profile-grid tile and the portrait form of an iPad screen.

4:3

iPads, compact cameras, old TVs and 4:3 slides; a landscape option in feeds.

9:16

Full-screen vertical: Stories, Reels, TikTok, Shorts and phone wallpapers.

16:9

HD video, YouTube thumbnails, monitors and TVs; 1920 by 1080 and 1280 by 720.

2:3

Pinterest standard pins and portrait 35mm photos; 1000 by 1500 pixels.

3:2

35mm film and most camera sensors, 4 by 6 inch prints and Surface screens.

1.91:1

Link preview and Open Graph images on Facebook and LinkedIn; 1200 by 628.

3:1

The X (Twitter) header at 1500 by 500 and other wide banner strips.

4:1

The LinkedIn personal profile banner at 1584 by 396 pixels.

16:10

Laptop display ratio: 1920 by 1200, 2560 by 1600, 1440 by 900.

2:1

Large link cards on X, blog covers and hero banners; 1200 by 600.

Other sizes

Sizes that do not reduce to a standard ratio.

Aspect ratios used on social media

An aspect ratio is width to height, reduced to the smallest whole numbers. 1080 by 1350 becomes 4:5 because both divide by 270. Platforms publish ratios rather than pixel sizes because the same ratio scales cleanly to any screen. The ratios below cover almost every social format in 2026.

RatioDecimalWhere it is usedCommon size
4:50.80Instagram, Facebook, LinkedIn, Threads feed posts1080 x 1350
1:11.00Square posts on every platform1080 x 1080
9:160.5625Stories, Reels, TikTok, Shorts1080 x 1920
16:91.78YouTube thumbnails, X images, video1280 x 720
1.91:11.91Link previews, landscape feed posts1200 x 628
2:30.67Pinterest pins1000 x 1500
3:40.75Instagram profile grid tiles1080 x 1440
3:13.00X header1500 x 500

Scaling without distortion

To resize an image while keeping its ratio, change one side and multiply or divide the other by the same factor. From 4:5 at 1080 wide, the height is 1080 times 5 over 4, which is 1350. Enter either the new width or the new height in the calculator and the other side is filled in and rounded to a whole pixel.

When the ratios do not match, you have two choices: crop to the new ratio or pad it. Neither is a calculation problem; both are handled in the image resizer, which applies the result to a real file and exports every platform size at once.

How to use it

  1. 01

    Enter the width and height of an image, a template, or a video frame.

  2. 02

    Read the ratio. 1080 by 1350 simplifies to 4:5; 1080 by 1920 to 9:16.

  3. 03

    Type a new width or height to scale the same ratio to a different size without distortion.

Questions

  • 4:5, or 0.8 to 1. It is the tallest ratio Instagram, Facebook, LinkedIn and Threads show uncropped in the feed, which is why Creobee exports every post at that size.

  • Divide both numbers by their greatest common divisor. 1080 and 1350 share 270, giving 4 and 5. For odd sizes, divide width by height and compare the decimal to a known ratio: 0.8 is 4:5, 0.5625 is 9:16, 1.778 is 16:9.

  • 4:5 for feed posts on Instagram, Facebook, LinkedIn and Threads. 9:16 for Stories, Reels, TikTok and Shorts. 16:9 for YouTube thumbnails and X. 2:3 for Pinterest. Square 1:1 still works everywhere but shows smaller than 4:5 in the feed.

  • No. It is arithmetic in your browser. There is no file to upload.

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