Aspect Ratio Calculator
Free Online Aspect Ratio Calculator - 16:9, 4:3, 21:9
Calculate aspect ratio from width and height, or calculate dimensions from a ratio and one side. Includes common resolution references.
📐 What is Aspect Ratio?
Aspect ratio is the proportional relationship between width and height. 16:9 is the most common widescreen ratio, while 4:3 is the classic TV ratio. It is essential in video production, design, and photography.
👁️ Ratio Comparison
16:9
4:3
1:1
21:9
9:16
3:2
📺 Common Resolutions
| Name | Resolution | Ratio |
|---|---|---|
| HD (720p) | 1280 x 720 | 16:9 |
| Full HD (1080p) | 1920 x 1080 | 16:9 |
| QHD (1440p) | 2560 x 1440 | 16:9 |
| 4K UHD | 3840 x 2160 | 16:9 |
| 8K UHD | 7680 x 4320 | 16:9 |
| XGA | 1024 x 768 | 4:3 |
| Instagram Square | 1080 x 1080 | 1:1 |
| Instagram Story | 1080 x 1920 | 9:16 |
| Ultrawide QHD | 3440 x 1440 | 21:9 |
| Super Ultrawide | 5120 x 1440 | 32:9 |
📖 How to Use
- Calculate Ratio: Enter width and height to compute the aspect ratio
- Calculate Dimension: Enter a ratio and one dimension to find the other
- Click preset buttons to quickly select common ratios
💡 Aspect Ratio Tips
- YouTube default: 16:9
- Instagram feed: 1:1 or 4:5
- Instagram Story/Reels: 9:16
- Cinema screen: 21:9 or 2.35:1
- Super ultrawide monitor: 32:9