Glisio21:9 in pixels
21:9 is the marketing name for ultrawide screens. Common 21:9 resolutions are 2560×1080, 3440×1440, and 5120×2160. The exact ratio of these monitors is 64:27 (2.37:1), close to cinema scope.
21:9 resolutions
| Resolution (px) | Name | Typical use |
|---|---|---|
| 2560×1080 | UW-FHD | Entry ultrawide monitors |
| 3440×1440 | UW-QHD | Most popular ultrawide |
| 3840×1600 | UW-QHD+ | 38-inch ultrawide |
| 5120×2160 | UW-5K | High-end ultrawide |
21:9 sizes by platform
| Platform | Size (px) | Note |
|---|---|---|
| Ultrawide screen recordings | Native size | Crop to 16:9 for YouTube |
| Cinematic video | 2.39:1 masters | Letterboxed on 16:9 screens |
21:9 screen sizes in inches and cm
Width and height of a 21:9 screen from its diagonal. Width = diagonal × 21 ÷ √(21² + 9²).
| Diagonal | Width × height (in) | Width × height (cm) |
|---|---|---|
| 29" | 26.7 × 11.4 | 67.7 × 29 |
| 34" | 31.3 × 13.4 | 79.4 × 34 |
| 38" | 34.9 × 15 | 88.7 × 38 |
| 49" | 45 × 19.3 | 114.4 × 49 |
21:9 calculator
Type a width or height to get the matching 21:9 size.
Platform presets
Aspect ratio
2560 × 1080px · 21:9
Formula: height = width × 9 ÷ 21
21:9 FAQ
- What is 21:9 in pixels?
- 2560×1080, 3440×1440, and 5120×2160 are the common 21:9 ultrawide resolutions.
- Is 21:9 exactly 21 by 9?
- Not quite. Ultrawide monitors are 64:27 (about 2.37:1). 21:9 is a rounded label.