Aspect Ratio Calculator — Resize Width & Height Proportionally
How Aspect Ratios Work
An aspect ratio describes the proportional relationship between an image or video's width and height. When you resize content while maintaining its aspect ratio, you prevent stretching or squishing. This calculator finds the simplified ratio (like 16:9) and lets you compute new dimensions by entering either a target width or height.
Common Aspect Ratios
| Ratio | Use Case | Example Resolution |
|---|---|---|
| 16:9 | HD Video, YouTube, TV | 1920×1080 |
| 4:3 | Classic TV, iPad | 1024×768 |
| 1:1 | Instagram, Profile pics | 1080×1080 |
| 9:16 | TikTok, Reels, Stories | 1080×1920 |
| 21:9 | Ultrawide, Cinema | 2560×1080 |