What is a 1:2 aspect ratio?
The 1:2 or 9:18 aspect ratio is a smartphone's most commonly used ratio on devices such as LG G6[1], Google Pixel 2 XL[2], and Sony Xperia XZ3. It's a vertical orientation of the landscape's 2:1 or 18:9 aspect ratio, a popular cinematic format for movie production.
The 1:2 ratio is twice as tall as the 1:1 square aspect ratio and 12.5% taller than the 9:16 tall aspect ratio.
The aspect ratio has a standard format of 1:2 or W:H, where W refers to the width, and H refers to the height of an image, screen, or container. In digital space, the measurement unit is in pixels. You can pronounce it "one-by-two" or "one-to-two" aspect ratio.
1:2 or 18:9 ratio formula
You can use the one-by-two ratio formula to determine if an image or display has a 1:2 or 9:18 aspect ratio. First, measure the width and height of your image, video, or screen in either centimeters, inches, or pixels. Next, divide the width by the height. If the result is equal to 0.5, then it has a 1:2 aspect ratio.
To find a new width (W) from a desired height (H):
To find a new height (H) from a desired width (W):
1:2 resolution cheat sheet
Here are the 1:2 resolutions on vertical photos, videos, smartphones, tablets, laptops, and monitors.
| Width (px) | Height (px) | Pixel Count | Standard |
|---|---|---|---|
| 640 | 1280 | 819,200 | Vertical 720p |
| 720 | 1280 | 921,600 | Vertical HD+ |
| 960 | 1920 | 1,843,200 | Vertical 1080p |
| 1080 | 2160 | 2,332,800 | Vertical FHD+ |
| 1440 | 2880 | 4,147,200 | Vertical QHD+ |
| 2160 | 4320 | 9,331,200 | Vertical 4K UHD+ |
| 2880 | 5760 | 16,588,800 | Vertical 5K UHD+ |
| 4320 | 8640 | 37,324,800 | Vertical 8K UHD+ |
1:2 dimensions cheat sheet
Here are the dimensions, in inches and centimeters, for everyday display and printing sizes with diagonals ranging from 1 to 98 inches.
| Diagonal | Width | Height |
|---|---|---|
| 1″ 2.54 cm | 0.45″ 1.14 cm | 0.89″ 2.27 cm |
| 2″ 5.08 cm | 0.89″ 2.27 cm | 1.79″ 4.54 cm |
| 3″ 7.62 cm | 1.34″ 3.41 cm | 2.68″ 6.82 cm |
| 4″ 10.16 cm | 1.79″ 4.54 cm | 3.58″ 9.09 cm |
| 5″ 12.7 cm | 2.24″ 5.68 cm | 4.47″ 11.36 cm |
| 6″ 15.24 cm | 2.68″ 6.82 cm | 5.37″ 13.63 cm |
| 7″ 17.78 cm | 3.13″ 7.95 cm | 6.26″ 15.9 cm |
| 8″ 20.32 cm | 3.58″ 9.09 cm | 7.16″ 18.17 cm |
| 9″ 22.86 cm | 4.02″ 10.22 cm | 8.05″ 20.45 cm |
| 10″ 25.4 cm | 4.47″ 11.36 cm | 8.94″ 22.72 cm |
| 11″ 27.94 cm | 4.92″ 12.5 cm | 9.84″ 24.99 cm |
| 12″ 30.48 cm | 5.37″ 13.63 cm | 10.73″ 27.26 cm |
| 13″ 33.02 cm | 5.81″ 14.77 cm | 11.63″ 29.53 cm |
| 14″ 35.56 cm | 6.26″ 15.9 cm | 12.52″ 31.81 cm |
| 15″ 38.1 cm | 6.71″ 17.04 cm | 13.42″ 34.08 cm |
| 16″ 40.64 cm | 7.16″ 18.17 cm | 14.31″ 36.35 cm |
| 17″ 43.18 cm | 7.6″ 19.31 cm | 15.21″ 38.62 cm |
| 18″ 45.72 cm | 8.05″ 20.45 cm | 16.1″ 40.89 cm |
| 19″ 48.26 cm | 8.5″ 21.58 cm | 16.99″ 43.17 cm |
| 20″ 50.8 cm | 8.94″ 22.72 cm | 17.89″ 45.44 cm |
| 21″ 53.34 cm | 9.39″ 23.85 cm | 18.78″ 47.71 cm |
| 22″ 55.88 cm | 9.84″ 24.99 cm | 19.68″ 49.98 cm |
| 23″ 58.42 cm | 10.29″ 26.13 cm | 20.57″ 52.25 cm |
| 24″ 60.96 cm | 10.73″ 27.26 cm | 21.47″ 54.52 cm |
| 25″ 63.5 cm | 11.18″ 28.4 cm | 22.36″ 56.8 cm |
| 26″ 66.04 cm | 11.63″ 29.53 cm | 23.26″ 59.07 cm |
| 27″ 68.58 cm | 12.07″ 30.67 cm | 24.15″ 61.34 cm |
| 28″ 71.12 cm | 12.52″ 31.81 cm | 25.04″ 63.61 cm |
| 29″ 73.66 cm | 12.97″ 32.94 cm | 25.94″ 65.88 cm |
| 30″ 76.2 cm | 13.42″ 34.08 cm | 26.83″ 68.16 cm |
| 32″ 81.28 cm | 14.31″ 36.35 cm | 28.62″ 72.7 cm |
| 34″ 86.36 cm | 15.21″ 38.62 cm | 30.41″ 77.24 cm |
| 40″ 101.6 cm | 17.89″ 45.44 cm | 35.78″ 90.87 cm |
| 42″ 106.68 cm | 18.78″ 47.71 cm | 37.57″ 95.42 cm |
| 43″ 109.22 cm | 19.23″ 48.84 cm | 38.46″ 97.69 cm |
| 48″ 121.92 cm | 21.47″ 54.52 cm | 42.93″ 109.05 cm |
| 50″ 127 cm | 22.36″ 56.8 cm | 44.72″ 113.59 cm |
| 55″ 139.7 cm | 24.6″ 62.48 cm | 49.19″ 124.95 cm |
| 58″ 147.32 cm | 25.94″ 65.88 cm | 51.88″ 131.77 cm |
| 60″ 152.4 cm | 26.83″ 68.16 cm | 53.67″ 136.31 cm |
| 65″ 165.1 cm | 29.07″ 73.83 cm | 58.14″ 147.67 cm |
| 70″ 177.8 cm | 31.3″ 79.51 cm | 62.61″ 159.03 cm |
| 75″ 190.5 cm | 33.54″ 85.19 cm | 67.08″ 170.39 cm |
| 77″ 195.58 cm | 34.44″ 87.47 cm | 68.87″ 174.93 cm |
| 83″ 210.82 cm | 37.12″ 94.28 cm | 74.24″ 188.56 cm |
| 85″ 215.9 cm | 38.01″ 96.55 cm | 76.03″ 193.11 cm |
| 86″ 218.44 cm | 38.46″ 97.69 cm | 76.92″ 195.38 cm |
| 97″ 246.38 cm | 43.38″ 110.18 cm | 86.76″ 220.37 cm |
| 98″ 248.92 cm | 43.83″ 111.32 cm | 87.65″ 222.64 cm |
FAQs
How do I calculate the 1:2 aspect ratio?
The 1:2 aspect ratio is a screen or image format that proportionally contains one unit horizontally for every two vertically. It can be calculated by dividing the width by height and getting a value of 0.5.
For example, the ratio between the width and height of the QHD+ (1440 x 2880) and FHD+ (1080 x 2160)[3] resolutions equals 0.5.
How to use 1:2 aspect ratio calculator by Calculator Hub?
Our 1:2 aspect ratio calculator is easy to use. You only need to input one dimension (width or height), and the calculator will automatically calculate the other dimension based on the 1:2 aspect ratio. For instance, if you enter a width of 540 pixels, the calculator will calculate a height of 1080 pixels.
On top of that, by entering a screen diagonal, you will also get additional information, including the screen's width, height, pixel density, and more.
