2560x1080 aspect ratio: 64:27, about 21:9 (1.59% off)
2560 × 1080 reduces to 64:27. The greatest common divisor of 2560 and 1080 is 40, so 2560 ÷ 40 = 64 and 1080 ÷ 40 = 27. That is 1.59% off 21:9. The nearest exact 21:9 sizes are 2520 × 1080 and 2562 × 1098.
Published · Updated · Sources last verified
At a glance
64:27
2560 × 1080 is about 21:9, 1.59% off.
- Decimal
- 2.37:1
- Nearest named ratio
- 21:9, 1.59% off
- Orientation
- Landscape
- Pixels
- 2,764,800
- Megapixels
- 2.76
- Greatest common divisor
- 40
How 2560 × 1080 reduces
- 2560 = 2 × 1080 + 400
- 1080 = 2 × 400 + 280
- 400 = 1 × 280 + 120
- 280 = 2 × 120 + 40
- 120 = 3 × 40 + 0
The last divisor, 40, is the greatest common divisor, so 2560 × 1080 reduces to 64:27. The method by hand is on the calculator page.
Crop or pad 2560 × 1080 to common ratios
How far 2560 × 1080 is from 21:9
2560 × 1080 is 1.59% off 21:9. The largest exact 21:9 size inside it is 2520 × 1080, 40 px narrower and the same height. The smallest exact 21:9 canvas around it is 2562 × 1098, 2 px wider and 18 px taller.
Whole-pixel downscales
| Divide by | Size | Whole pixels | Nearest whole size |
|---|---|---|---|
| ÷2 | 1280 × 540 | yes | same |
| ÷3 | 853.33 × 360 | no | 853 × 360, 0.039% off 64:27 |
| ÷4 | 640 × 270 | yes | same |
| ÷5 | 512 × 216 | yes | same |
| ÷6 | 426.67 × 180 | no | 427 × 180, 0.078% off 64:27 |
| ÷8 | 320 × 135 | yes | same |
| ÷10 | 256 × 108 | yes | same |
Nearest listed ratios
| Size | Reduced ratio | Decimal | Difference from 2560 × 1080 |
|---|---|---|---|
| 2560 × 1080this page's size | 64:27 | 2.37:1 | - |
| 3440 × 1440 | 43:18 | 2.389:1 | 0.78% |
| 1200 × 628 | 300:157 | 1.911:1 | 19.4% |
| 4096 × 2160 | 256:135 | 1.896:1 | 20% |
Facts about 2560 × 1080
- 2560 × 1080 is not exactly 21:9: 64:27 is 2.37, against 2.333 for 21:9, 1.59% apart.
- 2560 × 1080 divides into whole pixels by 2, 4, 5, 8 and 10; ÷3 gives 853.33 × 360, which is not whole pixels.
- Turned on its side, 2560 × 1080 becomes 1080 × 2560 (27:64).
- Cropped to 9:16, 2560 × 1080 keeps 23.8% (608 × 1080); cropped to 16:9 it keeps 75% (1920 × 1080).
- 2560 × 1080 is 2,764,800 pixels (2.76 MP), 1.33 times the pixel count of 1920 × 1080.
Sourced notes
"21:9" is a marketing name. Wikipedia files the TVs sold as 21:9 cinema displays from 2009 to 2012 under 64:27, which is wider than an exact 21:9 (7:3).
Source: Wikipedia: Aspect ratio (image). Last verified 2026-10-05.
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Aspect ratio 64:27 (2.37:1). Nearest named ratio 21:9, 1.59% off.
Aspect ratio
64:27
2.37:1
Nearest named ratio: 21:9 (2.333).
Not exactly 21:9: 1.59% off. The nearest exact 21:9 sizes are 2520 × 1080 and 2562 × 1098.
64:27 is the true reduced ratio. Sizes like this are usually described by their decimal or by the nearest named ratio.
- Width ÷ height
- 2.3704
- Height ÷ width
- 0.4219
- Shape
- landscape
Your numbers, worked
gcd(2560, 1080) = 40
2560 ÷ 40 = 64
1080 ÷ 40 = 27
2560 ÷ 1080 = 2.3704
Show how the gcd was found
- 2560 = 2 × 1080 + 400
- 1080 = 2 × 400 + 280
- 400 = 1 × 280 + 120
- 280 = 2 × 120 + 40
- 120 = 3 × 40 + 0
Divide the larger side by the smaller, then divide the last divisor by the remainder until the remainder is 0. The last divisor is the gcd.
What each ratio would cut from 2560 × 1080
The largest centred crop at each ratio, best fit first. Crop rather than stretch.
| Ratio | Fit | Crop to | Lost |
|---|---|---|---|
| 21:9 | Trim width | 2520 × 1080 | 1.56% |
| 2:1 | Trim width | 2160 × 1080 | 15.6% |
| 1.91:1 | Trim width | 2063 × 1080 | 19.4% |
| 16:9 | Trim width | 1920 × 1080 | 25% |
| 16:10 | Trim width | 1728 × 1080 | 32.5% |
| 32:9 | Trim height | 2560 × 720 | 33.3% |
| 3:2 | Trim width | 1620 × 1080 | 36.7% |
| 4:3 | Trim width | 1440 × 1080 | 43.8% |
| 5:4 | Trim width | 1350 × 1080 | 47.3% |
| 1:1 | Trim width | 1080 × 1080 | 57.8% |
| 4:5 | Trim width | 864 × 1080 | 66.3% |
| 3:4 | Trim width | 810 × 1080 | 68.4% |
| 2:3 | Trim width | 720 × 1080 | 71.9% |
| 9:16 | Trim width | 608 × 1080 | 76.3% |
Solve the missing side
Pick a ratio, then enter the side you know.
Height is 1080. Size 2560 by 1080 pixels.
Size at 64:27
2560 × 1080
Height solved, in pixels.
Your numbers, worked
H = W × 27 ÷ 64 = 2560 × 27 ÷ 64 = 1080
Whole number, so no rounding is needed.
Pixel-exact: a 64:27 size needs the width to be a multiple of 64, and 2560 is 40 × 64.
Questions
What aspect ratio is 2560x1080?
2560 × 1080 is 64:27 (2.37:1). Dividing both sides by their greatest common divisor, 40, gives 64 and 27. The nearest named ratio is 21:9, 1.59% away, so it is close to 21:9 but not exactly it.
Is 2560x1080 exactly 21:9?
No. 2560 ÷ 1080 = 2.3704, against 2.3333 for 21:9, 1.59% apart. The largest exact 21:9 size inside it is 2520 × 1080; the smallest exact 21:9 canvas around it is 2562 × 1098.
What is 2560x1080 cropped to 9:16?
A centered 9:16 crop of 2560 × 1080 is 608 × 1080, which keeps 23.8% of the image. Padding it to 9:16 instead gives a 2560 × 4551 canvas with 3,471 px of bars. That canvas is rounded, not exactly 9:16: the exact padded side would be 4551.11 px tall. The smallest exact 9:16 canvas around it is 2565 × 4560.
Nearby sizes
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Apart from the sourced notes above, which devices use this size, and marketing names for it, are not covered: we did not verify a primary source for them, so this page sticks to arithmetic.