Aspect Ratio Calculator
Calculate ratios and scale dimensions proportionally.
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16:9
16:9
Scale to New Size
Enter a new width or height and the other dimension will be calculated automatically.
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Common Aspect Ratios
| Ratio | Common Use | Example Resolutions |
|---|---|---|
| 16:9 | Widescreen monitors, YouTube, TV | 1920x1080, 3840x2160 |
| 4:3 | Classic TV, presentations, iPad | 1024x768, 2048x1536 |
| 1:1 | Instagram posts, profile pics | 1080x1080, 400x400 |
| 9:16 | TikTok, Reels, Stories, phone video | 1080x1920 |
| 21:9 | Ultrawide monitors, cinema | 2560x1080, 3440x1440 |
| 3:2 | DSLR cameras, Surface devices | 1440x960, 6000x4000 |
Frequently Asked Questions
What is an aspect ratio?
An aspect ratio is the proportional relationship between width and height. A 16:9 ratio means for every 16 units of width, there are 9 units of height, regardless of the actual pixel size.
Why does aspect ratio matter for video?
Using the wrong aspect ratio causes black bars (letterboxing/pillarboxing) or stretching. YouTube uses 16:9, TikTok/Reels use 9:16, and Instagram posts use 1:1 or 4:5.