21:9 Aspect Ratio Calculator
21:9 is the ultrawide aspect ratio used by cinematic monitors and immersive gaming displays. It closely matches the 2.33:1 cinema scope format, giving extra horizontal space for productivity and games.
Ratio locked to 21:9. Enter either side, get the other.
Enter a width or height above.
Common 21:9 sizes
| Pixels | Usage |
|---|---|
| 2560×1080 | UW-UXGA |
| 3440×1440 | UW-QHD |
| 3840×1600 | UW4K (16:6.7) |
| 5120×2160 | UW5K |
Frequently asked questions
What is 21:9 aspect ratio?
21:9 (about 2.33:1) is the ultrawide format of cinema-style monitors. Movies fill the screen almost completely, eliminating the letterbox bars seen on 16:9 displays.
Is 21:9 good for gaming?
Many games support 21:9 natively and it expands the field of view. Esports titles sometimes restrict ultrawide to keep competition fair, so check each game's rules.
Why do some monitors say 21.5:9 or 32:9?
Manufacturers round the true ratios for marketing. 21:9 displays are often closer to 21.5:9 or 43:18, while super-ultrawide 32:9 is essentially two 16:9 screens side by side.