← All tools
Aspect Ratio Calculator
Calculate the aspect ratio from any width and height, or find a missing dimension to maintain a ratio — covers 16:9, 4:3, 9:16, 21:9, and more.
×
Simplified
16:9
Decimal
1.7778
Known As
Widescreen (16:9)
:
Width 1280 → Height: 720
| Ratio | Name | Common sizes | Use case |
|---|---|---|---|
| 16:9 | Widescreen | 1920×1080, 1280×720, 3840×2160 | HD/4K video, monitors, YouTube |
| 9:16 | Portrait | 1080×1920, 1080×2400 | Mobile, Instagram Reels, TikTok |
| 4:3 | Standard | 1024×768, 1280×960, 800×600 | Old monitors, photography |
| 1:1 | Square | 1080×1080, 720×720 | Instagram posts, profile pics |
| 21:9 | Ultrawide | 2560×1080, 3440×1440 | Ultrawide monitors, cinema |
| 3:2 | Photo | 3000×2000, 4500×3000 | DSLR cameras, 35mm film |
| 5:4 | Monitor | 1280×1024, 2560×2048 | Square monitors, printing |
| 2:1 | Panoramic | 2000×1000, 4096×2048 | Panoramas, letterbox film |
Click any row to use that ratio in the calculator above.