Aspect ratio calculator
Aspect ratio calculator for video and photos: type a size or a ratio, get the missing side, and see how a clip crops into another shape.
- Ratio of 1080×1920
- 9:16
- Closest common ratio
- 9:16
- Width ÷ height
- 0.5625
- Shape
- Portrait (vertical)
Drag the corner to try a shape. It snaps to common ratios.
Crop or fit a 16:9 clip into 9:16
Changing shape either crops the sides (fill) or adds bars (fit). Pick the clip's shape, or drop your own file.
How to calculate an aspect ratio
An aspect ratio is a picture's width compared with its height, written width:height. To get it from a size, divide both sides by their greatest common divisor: 1920 and 1080 both divide by 120, so 1920×1080 is 16:9.
To find a missing side, multiply: height = width × (ratio height ÷ ratio width). A 9:16 video 1080 pixels wide is 1080 × 16 ÷ 9 = 1920 pixels tall. Going the other way, width = height × (ratio width ÷ ratio height).
Some sizes don't simplify neatly. 1080×566 reduces to 540:283, which is about 1.91:1, the shape Instagram uses for landscape posts. The calculator shows the exact ratio and the closest common one.
Common aspect ratios
| Ratio | Used for | Common size | Width ÷ height |
|---|---|---|---|
| 9:16 | TikTok, Reels, Shorts, Stories | 1080×1920 | 0.5625 |
| 16:9 | YouTube, TVs, laptops | 1920×1080 | 1.7778 |
| 4:5 | Instagram feed (portrait) | 1080×1350 | 0.8 |
| 1:1 | Square posts | 1080×1080 | 1 |
| 3:4 | Instagram profile grid, iPhone photos | 1080×1440 | 0.75 |
| 4:3 | Older TVs, iPads, photos | 1440×1080 | 1.3333 |
| 21:9 | Ultrawide, cinema | 2560×1080 | 2.3333 |
| 1.91:1 | Instagram landscape posts, link previews | 1080×566 | 1.91 |
Video sizes for TikTok, Instagram and YouTube
| Platform | Size | Ratio | Length |
|---|---|---|---|
| TikTok | 1080×1920 | 9:16 | Recording: up to 10 minutes; uploads: set per account |
| Instagram Reels | 1080×1920 | 9:16 | Up to 20 minutes (3 to reach non-followers) |
| Instagram Stories | 1080×1920 | 9:16 | Up to 60 seconds per story video |
| Instagram feed | 1080×1350 | 4:5 (accepts 4:5 to 1.91:1) | – |
| YouTube Shorts | 1080×1920 | 9:16 or 1:1 | Up to 3 minutes |
| YouTube | 1920×1080 | 16:9 | – |
Every platform here plays vertical video full screen at 9:16, so one 1080×1920 export covers TikTok, Reels, Shorts and Stories. Feed posts are the exception: 4:5 takes up more of the Instagram feed than 9:16, which gets cropped there.
Sources
Official help, developer and ads pages, checked on October 13, 2026. Platforms change limits often; your upload screen has the final word.
- TikTok Support: Making a post
- TikTok for Developers: Query Creator Info
- Instagram Help: Reel size & aspect ratios
- Instagram Help: Record a reel
- Meta for Developers: IG User Media (Reels, Stories and image specs)
- YouTube Help: Understand three-minute YouTube Shorts
- YouTube Help: Video resolution & aspect ratios
How to use Aspect ratio calculator
- 1
Pick a ratio
Tap a common ratio such as 9:16 or 16:9, type your own, or drag the corner of the preview until the shape looks right.
- 2
Type one side
Enter a width or a height and the other side is solved for you. Turn off "Keep the ratio" and type both sides to find the ratio of any size.
- 3
Check the crop
Pick your clip's shape, or drop the file in, to see how much of the picture survives a crop and how big the bars are if you fit it instead.
FAQAspect ratio calculator FAQ
How do you calculate an aspect ratio?
Divide the width and the height by their greatest common divisor. 1920×1080: both divide by 120, giving 16:9. To find a missing side, height = width × (ratio height ÷ ratio width), so 1080 wide at 9:16 is 1080 × 16 ÷ 9 = 1920 tall.
What aspect ratio is 1920×1080?
16:9, the standard widescreen shape used by YouTube, TVs and laptops. Turned on its side, 1080×1920 is 9:16, the vertical shape of TikTok, Instagram Reels and YouTube Shorts.
What aspect ratio should I use for TikTok, Reels and Shorts?
9:16 at 1080×1920 pixels. All three fill the phone screen with it. Instagram's feed also takes 4:5 (1080×1350), which shows bigger in the feed but gets cropped in Reels.
What happens when I put a 16:9 video into a 9:16 frame?
You either crop it or fit it. Cropping to fill the frame keeps only the middle 32% of the picture's width. Fitting the whole picture leaves it covering 32% of the frame, with bars above and below.
Why should video sizes be even numbers?
Most video encoders, including H.264, store colour at half resolution and need even widths and heights. The calculator warns you when a side is odd and suggests the nearest even size.
Is my photo or video uploaded when I drop it in?
No. Your browser reads the file's width, height and length on your device. Nothing is sent to UGCLive or anyone else, and the file is gone when you close the tab.
Still have questions?Email us
More free tools
TikTok dimensionsTikTok video size is 1080×1920 pixels at a 9:16 aspect ratio. Below are the length, file size and format limits from TikTok's own pages.
Reels dimensionsInstagram Reels size is 1080×1920 pixels at a 9:16 aspect ratio. Stories use the same frame; feed posts take 4:5 to 1.91:1.
Shorts dimensionsYouTube Shorts size is 1080×1920 pixels at a 9:16 aspect ratio, and a Short can be up to 3 minutes long.
9:16 pixel sizesThe 9:16 aspect ratio is the vertical video shape, 9 units wide for every 16 tall: 1080×1920 pixels in full HD, used by TikTok, Reels, Shorts and Stories.
From the UGCLive appEdit in 9:16 and export 1080×1920.
UGCLive exports every video at 1080×1920, ready for TikTok, Reels and Shorts. Set each clip's framing in the editor so the face stays in shot.
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