Aspect ratio calculator
Put in a width and height to get the aspect ratio, work out a new size at the same ratio, and see the crop that makes it 9:16, 1:1 or 4:5.
Aspect ratio
16:9
Widescreen: YouTube videos, TVs, most cameras and screens.
- Width ÷ height
- 1.78
- Pixels
- 2.07 MP
- Shape
- Landscape
Change its shape
For TikTok, Reels and Shorts, crop the middle 608 × 1080, then scale it to 1080 × 1920. That keeps 32% of the picture.
Common ratios: 16:9, 9:16, 1:1, 4:5, 4:3, 3:4, 3:2, 2:3, 5:4, 16:10, 21:9, 1.91:1. Sizes are rounded to whole, even pixels, which video needs.
How aspect ratio works
An aspect ratio is a picture's width compared with its height. 1920 × 1080 and 1280 × 720 are different sizes with the same shape, 16:9, because both reduce to 16 by 9.
To resize without stretching, keep the ratio: new height = new width × height ÷ width. A 1920 × 1080 video at 1280 wide is 1280 × 1080 ÷ 1920 = 720 high. Video needs both sides to be even numbers, so round to the nearest even pixel.
Sizes for each platform
The sizes the platforms recommend for video and images, and their shapes.
| Where | Ratio | Size in pixels |
|---|---|---|
| TikTok, Reels and Shorts | 9:16 | 1080 × 1920 |
| Instagram and Facebook Stories | 9:16 | 1080 × 1920 |
| YouTube video (1080p) | 16:9 | 1920 × 1080 |
| YouTube video (4K) | 16:9 | 3840 × 2160 |
| YouTube thumbnail | 16:9 | 3840 × 2160 |
| Instagram portrait post | 4:5 | 1080 × 1350 |
| Instagram square post | 1:1 | 1080 × 1080 |
| Instagram landscape post | 1.91:1 | 1080 × 566 |
| X (Twitter) video | 16:9 | 1920 × 1080 |
| Link preview image | 1.91:1 | 1200 × 630 |
Common aspect ratios
| Ratio | Name | Used for | For example |
|---|---|---|---|
| 16:9 | Widescreen | YouTube videos, TVs, most cameras and screens | 1920 × 1080 |
| 9:16 | Vertical | TikTok, Instagram Reels, YouTube Shorts and Stories | 1080 × 1920 |
| 1:1 | Square | Instagram and Facebook feed posts, profile pictures | 1080 × 1080 |
| 4:5 | Portrait | Instagram and Facebook feed posts | 1080 × 1350 |
| 4:3 | Standard | Older TVs, iPads, many phone photos | 1440 × 1080 |
| 3:4 | Standard portrait | Phone photos held upright, Instagram's tallest posts | 1080 × 1440 |
| 3:2 | Classic photo | DSLR and mirrorless photos, 6 × 4 prints | 6000 × 4000 |
| 2:3 | Classic photo portrait | Upright photos, posters, Pinterest pins | 1000 × 1500 |
| 5:4 | Old monitor | Older computer monitors, 8 × 10 prints | 1280 × 1024 |
| 16:10 | Laptop | MacBooks and many laptop screens | 2560 × 1600 |
| 21:9 | Ultrawide | Ultrawide monitors, a cinema look | 3440 × 1440 |
| 1.91:1 | Link preview | Link previews, Instagram's landscape posts | 1200 × 630 |
Turning 16:9 into 9:16
A 9:16 crop of a 1920 × 1080 video is 608 × 1080: it keeps the middle 32% of the picture. That works when what matters is in the middle. When it isn't, like two people talking at opposite sides of a podcast set, a fixed crop cuts one of them off, and the crop has to move with whoever is speaking.
Crop or fit any video to 9:16 with the vertical video converter, check a video against each app with the video size checker, or read video sizes for TikTok, Reels and Shorts.
Questions
How do you work out an aspect ratio?
Divide the width and the height by the biggest number that goes into both. 1920 and 1080 are both divisible by 120, which leaves 16 and 9: 16:9. Or divide the width by the height for one number, 1.78:1.
What sizes are 16:9?
1280 × 720 (720p), 1920 × 1080 (1080p), 2560 × 1440 (1440p) and 3840 × 2160 (4K) are the common ones. Any width times 9 ÷ 16 gives the height.
What aspect ratio are TikTok, Reels and Shorts?
9:16, vertical, at 1080 × 1920 pixels. That fills a phone's screen. A 16:9 video posted as it is shows as a band across the middle.
What is a 4:5 aspect ratio?
A portrait shape a little taller than square: 1080 × 1350 pixels. It's a common size for Instagram and Facebook feed posts because it takes up more of the feed than a square or a landscape post.
How do I change a video's aspect ratio?
Crop it, which keeps part of the picture at full size, or fit it inside the new shape with bars or a blurred copy behind it, which keeps all of the picture smaller. The vertical video converter does both for 9:16.
Is 1366 × 768 16:9?
Almost. It's 683:384 in whole numbers, 1.779:1 against 16:9's 1.778:1, so it's treated as 16:9. The calculator shows a size like this as about 16:9.
16:9 in, 9:16 clips out
Paste a YouTube link and Clyper finds the best moments and frames each one vertically on whoever is talking, with captions: up to 30 clips per video.
Guides
- Making clipsVideo sizes for TikTok, Reels and Shorts in 2026The sizes, shapes and limits for each app, where captions are safe, and how to make a 16:9 video vertical.7 min read
- Making clipsHow to turn a YouTube video into Shorts, TikToks and ReelsThe quick way and by hand: the size and settings, cropping 16:9 to 9:16, and what to post where.5 min read
- Making clipsHow long should a TikTok, Reel or Short be?The limits on each app, what the apps themselves say about length, and how long a clip should run.4 min read
More free tools
- Vertical video converterTurn a horizontal video into a 1080 × 1920 one for TikTok, Reels and Shorts, cropped or fitted, without uploading it.
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- Video size checkerCheck a video's shape, size, length and format against what TikTok, Reels and Shorts take, and see what to fix.
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