The most common 21:9 resolutions are 2560 x 1080, 3440 x 1440, 3840 x 1600 and 5120 x 2160. They all belong to the ultrawide family, but they are not exactly the same shape, they do not carry the same number of pixels, and they suit very different screen sizes. This guide lists every 21:9 resolution you are likely to meet, from 720p class video formats up to 5K and beyond, explains why “21:9” is really a nickname, and shows what each one means for a desk, a meeting room or a control room.
21:9 Resolution List
Here is the complete list of 21:9 resolutions, sorted by pixel count. The “true ratio” column shows the exact shape behind the 21:9 label.
| Resolution | Common name | True ratio | Total pixels | Typical use |
|---|---|---|---|---|
| 1680 x 720 | 21:9 720p | 7:3 (2.33:1) | 1,209,600 | Video, streaming, mobile |
| 2560 x 1080 | UW-FHD (21:9 1080p) | 64:27 (2.37:1) | 2,764,800 | 25 to 29 inch monitors |
| 3440 x 1440 | UWQHD (21:9 1440p) | 43:18 (2.39:1) | 4,953,600 | 34 inch monitors |
| 3840 x 1600 | UWQHD+ (WQHD+) | 12:5 (2.40:1) | 6,144,000 | 37.5 to 38 inch monitors |
| 5120 x 2160 | 5K2K, WUHD (21:9 4K) | 64:27 (2.37:1) | 11,059,200 | 40 inch monitors to 105 inch displays |
| 6880 x 2880 | 6K ultrawide | 43:18 (2.39:1) | 19,814,400 | High end creative work |
| 7680 x 3200 | 8K ultrawide | 12:5 (2.40:1) | 24,576,000 | Content creation, video walls |
| 10240 x 4320 | 10K (21:9 8K) | 64:27 (2.37:1) | 44,236,800 | Video walls, content mastering |
Four of these cover almost every ultrawide screen sold today. The diagram below draws them at the same scale, so the difference in real pixel area is easy to see: a 5120 x 2160 screen carries four times the pixels of a 2560 x 1080 screen.
2560 x 1080 (UW-FHD)
2560 x 1080 is the 21:9 version of 1080p: the same 1080 lines as Full HD, stretched to 2560 columns. It is the entry point of the ultrawide family and is usually found on 25 to 29 inch monitors. It is easy to drive and widely supported, but on screens larger than 29 inches the pixel density drops quickly and text starts to look soft.
3440 x 1440 (UWQHD)
3440 x 1440 is the most popular desktop ultrawide resolution and the 21:9 version of 1440p. On a 34 inch screen it gives about 110 pixels per inch, which keeps text sharp at a normal desk distance. Jupiter’s Pana 34 uses this native resolution, with a 165 Hz refresh rate, 10 point touch and a built-in 4K camera.
3840 x 1600 (UWQHD+)
3840 x 1600 keeps the 3840 pixel width of 4K UHD but uses 1600 lines instead of 2160. It appears on 37.5 and 38 inch monitors. Is 3840 x 1600 a 21:9 resolution? It is sold as 21:9, but its true shape is 12:5 (2.40:1), slightly wider than the others.
5120 x 2160 (5K2K)
5120 x 2160 is the 21:9 version of 4K. It keeps the full 2160 vertical lines of 4K UHD and adds 1280 columns, for 11.06 million pixels in total. It is often called 5K2K or WUHD, and it is the reference resolution for large ultrawide displays, from 40 inch monitors up to 105 inch meeting room and control room displays.
Why 21:9 Is Really 64:27, 43:18 or 12:5
“21:9” is a marketing label chosen to sit next to 16:9. The exact ratio 21:9 (which simplifies to 7:3, or 2.33:1) is rarely used by real panels. Most ultrawide screens use one of three slightly wider shapes:
- 64:27 (2.37:1): 2560 x 1080, 5120 x 2160 and 10240 x 4320. This is the cleanest one mathematically, because 64:27 is 4:3 cubed, just as 16:9 is 4:3 squared.
- 43:18 (2.39:1): 3440 x 1440 and 6880 x 2880. This shape is very close to the 2.39:1 “scope” format used for widescreen cinema.
- 12:5 (2.40:1): 3840 x 1600 and 7680 x 3200.
Why 3440 and not 3413? A true 64:27 screen with 1440 lines would be 3413.3 pixels wide, which is not a whole number. Panel makers round to widths that divide cleanly for electronics and scaling, so 1440 line ultrawides landed on 3440, a slightly wider 43:18 shape. In everyday use, the differences between 2.37, 2.39 and 2.40 are almost invisible.
21:9 Resolution for 1080p, 1440p and 4K
A quick way to find the 21:9 resolution for a given height is to multiply the number of lines by about 2.37 and round to the standard width:
- 21:9 720p: 1680 x 720 (also seen as 1720 x 720)
- 21:9 1080p: 2560 x 1080
- 21:9 1440p: 3440 x 1440
- 21:9 1600p: 3840 x 1600
- 21:9 4K (2160p): 5120 x 2160
- 21:9 8K (4320p): 10240 x 4320
To go the other way, divide the width by 2.37 to get the height. When you set a custom resolution on a graphics card or a video processor, always use the standard pairs above rather than a calculated value: displays and scalers are built around them.
21:9 vs 16:9 vs 32:9
At the same height, a 21:9 screen is about 33% wider than a 16:9 screen, and a 32:9 “super ultrawide” is twice as wide as 16:9. A 32:9 screen is essentially two 16:9 screens joined without a bezel, which is why its resolutions are 3840 x 1080, 5120 x 1440 and 7680 x 2160.
For most professional work, 21:9 is the sweet spot. It is wide enough to place two or three full size applications side by side, but still tall enough to read documents, dashboards and video calls without craning your neck. 32:9 suits very wide timelines and simulation, while 16:9 remains the standard for TV content and for the tiles of a classic video wall. Our article on replacing dual monitors with a single ultrawide display looks at the productivity side in more detail.
5120 x 2160 vs 4K: What You Gain
5120 x 2160 and 3840 x 2160 (4K UHD) have exactly the same vertical resolution. The ultrawide simply adds 1280 columns, which means 33% more pixels: 11.06 million instead of 8.29 million. In practice, a full 4K source can sit on a 5120 x 2160 screen pixel for pixel, with no scaling, and a 1280 pixel column is left next to it for chat, a camera feed, alarms or a live data panel.
That extra width comes with extra bandwidth. A 5120 x 2160 signal at 60 Hz carries roughly 16 Gbps of active pixel data in 8 bit RGB, compared with about 12 Gbps for 4K60. For full 4:4:4 color at 60 Hz, plan for DisplayPort 1.4 or HDMI 2.1 class connections, and check that every device in the chain, from the source to the processor to the display, supports 5120 x 2160 natively.
Pixel Density: How Screen Size Changes the Picture
The same resolution looks very different on different screen sizes. Pixel density, measured in pixels per inch (PPI), tells you how sharp the image will look at a given distance:
- 34 inch at 3440 x 1440: about 110 PPI, ideal at a desk
- 81 inch at 5120 x 2160: about 69 PPI, sharp across a huddle or meeting room
- 92 inch at 5120 x 2160: about 60 PPI
- 105 inch at 5120 x 2160: about 53 PPI, close to a 4K display of about 83 inches
This is why large ultrawide displays need 5120 x 2160. At 2560 x 1080, an 81 inch screen would drop to about 34 PPI and text would break up at meeting room distances.
21:9 Displays for Meeting Rooms and Control Rooms
Resolution is only half of the story: we cover the productivity side in why the 21:9 aspect ratio is transforming workspaces. Jupiter brought the first 5K 21:9 ultrawide display to enterprise in 2021, and the Pana family now covers 21:9 from the desk to the boardroom:
- Pana 34: 34 inch ultrawide monitor, 3440 x 1440 at 165 Hz, with touch, camera and microphones.
- Pana 81 and Pana 105: native 5120 x 2160 ultrawide LCD displays with 700 nits brightness and a built-in OPS slot.
- Pana 92CT: 92 inch interactive 5120 x 2160 display for collaboration.
- Pana X: 105 inch premium ultrawide with 5K resolution and a 120 Hz native refresh rate.
To fill a 5120 x 2160 screen with several sources, the Pana MultiViewer combines up to four HDMI sources on one Pana in ten layouts, from picture in picture to quad view, with a 5120 x 2160 output. For larger rooms and multi display walls, SPARK 2.0 and Catalyst video wall processors drive native 5K ultrawide outputs: SPARK 2.0 is certified for Pana 5K 21:9, and Catalyst scales up to 12 5K outputs. You can read more about this pairing in how processors and ultrawide displays deliver 5K visualization.
Frequently Asked Questions
What are the 21:9 resolutions?
The main 21:9 resolutions are 2560 x 1080 (UW-FHD), 3440 x 1440 (UWQHD), 3840 x 1600 (UWQHD+) and 5120 x 2160 (5K2K). Less common ones include 1680 x 720, 6880 x 2880, 7680 x 3200 and 10240 x 4320.
Is 3440 x 1440 a 21:9 resolution?
Yes. 3440 x 1440 is the most common 21:9 resolution for desktop monitors. Its exact ratio is 43:18 (2.39:1), slightly wider than the nominal 21:9.
What is the 4K version of 21:9?
The 21:9 equivalent of 4K is 5120 x 2160, also called 5K2K or WUHD. It keeps the 2160 lines of 4K UHD and adds 1280 columns, for 33% more pixels.
What is the 1080p version of 21:9?
The 21:9 version of 1080p is 2560 x 1080. It has the same 1080 lines as Full HD with 640 extra columns.
Why is it called 21:9 and not 7:3?
21:9 is a marketing name chosen to match 16:9, so buyers can compare the two at a glance. Mathematically 21:9 equals 7:3, but real ultrawide panels use 64:27, 43:18 or 12:5, which are all slightly wider than 7:3.
Is 21:9 better than 16:9 for work?
For multitasking, usually yes. A 21:9 screen gives about a third more width at the same height, enough for two or three applications side by side or a 4K source plus a data column, without the bezel of a dual monitor setup.
Planning a 21:9 room or an ultrawide video wall? Talk to a Jupiter expert about matching the right Pana display and processor to your sources.
