Aspect Ratio Calculator2560x1080 at a glance
| Simplified ratio | 64:27 |
|---|---|
| Decimal (width ÷ height) | 2.3704:1 |
| Written as x:9 | 21.33:9 |
| Closest standard ratio | 21:9 (Ultrawide monitor), 1.59% off |
| Megapixels | 2.76 MP (2,764,800 pixels) |
| Pixels compared with 1920 × 1080 | 1.33× |
| Orientation | Landscape |
| CSS | aspect-ratio: 64 / 27; |
| Padding-top trick | padding-top: 42.1875%; |
What is 2560x1080 used for?
The entry-level ultrawide resolution, used on 25 to 29-inch and budget 34-inch monitors. It is sold as 21:9 but is really 64:27: 1080p with a third more width.
How the ratio is calculated
Divide both sides by their greatest common divisor (GCD). The GCD of 2560 and 1080 is 40, so 2560 ÷ 40 = 64 and 1080 ÷ 40 = 27, which gives 64:27. In CSS that is aspect-ratio: 64 / 27; with the older padding trick the height is 42.1875% of the width.
64:27 is not a round ratio, but it is only 1.59% away from 21:9, which is why 2560 × 1080 is sold and described as 21:9. An exact 21:9 image 2560 px wide would be 1,097.14 px tall instead of 1080.
Same-ratio sizes (64:27)
2560x1080 scaled down and up without changing its shape. Rows marked ≈ are rounded to whole pixels, so they are less than one pixel off.
| Size (px) | Scale | Megapixels |
|---|---|---|
| 640 × 270 | 25% | 0.17 |
| ≈ 853 × 360 | 33.3% | 0.31 |
| 1280 × 540 | 50% | 0.69 |
| ≈ 1707 × 720 | 66.7% | 1.23 |
| 1920 × 810 | 75% | 1.56 |
| 2560 × 1080 | 100% | 2.76 |
| ≈ 3413 × 1440 | 133.3% | 4.91 |
| 3840 × 1620 | 150% | 6.22 |
| 5120 × 2160 | 200% | 11.06 |
| 7680 × 3240 | 300% | 24.88 |
Nearby common sizes
- 3440 × 1440 ≈ 21:9 · UWQHD (ultrawide 1440p)
- 2560 × 1440 16:9 · QHD (1440p)
- 1920 × 1080 16:9 · Full HD (1080p)
- 1600 × 900 16:9 · HD+ (900p)
Frequently asked questions
What is the aspect ratio of 2560x1080?
2560 × 1080 has an aspect ratio of 64:27. The greatest common divisor of 2560 and 1080 is 40; dividing both sides by it gives 64:27. As a decimal that is 2.3704:1, 1.59% away from the standard 21:9 ratio.
How many megapixels is 2560x1080?
2560 × 1080 contains 2,764,800 pixels, or 2.76 megapixels. That is 1.33× the pixel count of 1920 × 1080 (Full HD).
Which sizes have the same aspect ratio as 2560x1080?
Exact scaled versions include 640 × 270, 1280 × 540, 1920 × 810, 3840 × 1620, 5120 × 2160, and 7680 × 3240. Any size of the form 64n × 27n has exactly the same shape.
How do I resize an image to 2560x1080 without distortion?
Crop it to 64:27 first, then scale it to 2560 × 1080. For any width W the matching height is W × 27 ÷ 64. The calculator on this page does the arithmetic: type a new width in box 2 and it fills in the height.
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