21:9 Aspect Ratio Calculator
21:9 is an ultrawide landscape ratio commonly associated with cinematic compositions and ultrawide monitors. Enter a width or height and AspectRatioZ calculates the matching 21:9 dimension instantly.
Calculate 21:9
About the 21:9 aspect ratio
21:9 is an ultrawide landscape ratio commonly associated with cinematic compositions and ultrawide monitors.
The ratio means that for every 21 units of width, there are 9 units of height. For example, 2560 × 1080 keeps the same shape at any scale.
Common uses include ultrawide monitors and cinematic layouts. The pixel dimensions can change while the 21:9 relationship stays the same.
Common 21:9 sizes
| Width | Height | Ratio |
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FAQ
What is 21:9?
21:9 is an ultrawide landscape ratio commonly associated with cinematic compositions and ultrawide monitors.
What is a common 21:9 resolution?
A common working example is 2560 × 1080. Use the calculator above to create other dimensions without changing the shape.
Can I scale a 21:9 image or video?
Yes. Keep width and height proportional. Changing one dimension and recalculating the other preserves the 21:9 aspect ratio.