3:4 aspect ratio (1:1.333): resolutions and sizes
3:4 means 3 units wide for every 4 tall, so width ÷ height = 0.75 and the height is 133.3% of the width. Exact 3:4 sizes are whole multiples of 3 × 4, such as 1080 × 1440 (360 × 3 by 360 × 4).
Published · Updated · Sources last verified
At a glance
3:4
3:4 is 1:1.333.
- Decimal
- 1:1.333
- Height as share of width
- 133.3%
- Exact sizes
- width a multiple of 3, height the same multiple of 4
3:4 heights at common widths
| Width | Height at 3:4 | Whole pixels | Size page |
|---|---|---|---|
| 360 | 480 | yes | - |
| 480 | 640 | yes | - |
| 540 | 720 | yes | - |
| 720 | 960 | yes | - |
| 1080example size | 1440 | yes | - |
| 1440 | 1920 | yes | - |
| 2160 | 2880 | yes | - |
Crop common sizes to 3:4
| Size | Centered 3:4 crop | Share kept | Exact |
|---|---|---|---|
| 1920 × 1080 | 810 × 1080 | 42.2% | yes |
| 3440 × 1440 | 1080 × 1440 | 31.4% | yes |
| 1080 × 1920 | 1080 × 1440 | 75% | yes |
| 2560 × 1440 | 1080 × 1440 | 42.2% | yes |
| 1280 × 720 | 540 × 720 | 42.2% | yes |
| 3840 × 2160 | 1620 × 2160 | 42.2% | yes |
| 1080 × 1350 | 1013 × 1350 | 93.8% | no |
| 1920 × 1200 | 900 × 1200 | 46.9% | yes |
3:4 against other ratios
| Other ratio | Decimal | Share kept or filled | Cropping 3:4 cuts | Padding adds bars |
|---|---|---|---|---|
| 16:9 | 1.778:1 | 42.2% | top and bottom | left and right |
| 9:16 | 1:1.778 | 75% | the sides | top and bottom |
| 4:5 | 1:1.25 | 93.8% | top and bottom | left and right |
| 1:1 | 1:1 | 75% | top and bottom | left and right |
| 4:3 | 1.333:1 | 56.3% | top and bottom | left and right |
| 1.91:1 | 1.91:1 | 39.3% | top and bottom | left and right |
Facts about 3:4
- The smallest whole-pixel 3:4 size is 3 × 4; 7 of the 7 common widths in the table give a whole-pixel height.
- Turned on its side, a 3:4 frame becomes 4:3: 1080 × 1440 becomes 1440 × 1080.
- Cropping 3:4 to 1.91:1 keeps the least of the common ratios, 39.3%; cropping to 4:5 keeps the most, 93.8%.
- Of the listed sizes in the crop table, 1080 × 1350 keeps the most when cropped to 3:4 (93.8%) and 3440 × 1440 the least (31.4%).
Sourced notes
News report only: PetaPixel reported on 2025-05-29 that Instagram added 3:4 photos. We could not confirm this on Instagram's own help page.
Source: PetaPixel, 2025-05-29: Instagram adds support for 3:4 photos. Last verified 2026-10-05.
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Aspect ratio 3:4 (1:1.333). Exact match for 3:4.
Aspect ratio
3:4
1:1.333
Exact match for 3:4.
- Width ÷ height
- 0.75
- Height ÷ width
- 1.3333
- Shape
- portrait
Your numbers, worked
gcd(1080, 1440) = 360
1080 ÷ 360 = 3
1440 ÷ 360 = 4
1080 ÷ 1440 = 0.75
Show how the gcd was found
- 1440 = 1 × 1080 + 360
- 1080 = 3 × 360 + 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 1080 × 1440
The largest centred crop at each ratio, best fit first. Crop rather than stretch.
| Ratio | Fit | Crop to | Lost |
|---|---|---|---|
| 3:4 | Exact | 1080 × 1440 | 0% |
| 4:5 | Trim height | 1080 × 1350 | 6.25% |
| 2:3 | Trim width | 960 × 1440 | 11.1% |
| 1:1 | Trim height | 1080 × 1080 | 25% |
| 9:16 | Trim width | 810 × 1440 | 25% |
| 5:4 | Trim height | 1080 × 864 | 40% |
| 4:3 | Trim height | 1080 × 810 | 43.8% |
| 3:2 | Trim height | 1080 × 720 | 50% |
| 16:10 | Trim height | 1080 × 675 | 53.1% |
| 16:9 | Trim height | 1080 × 608 | 57.8% |
| 1.91:1 | Trim height | 1080 × 565 | 60.8% |
| 2:1 | Trim height | 1080 × 540 | 62.5% |
| 21:9 | Trim height | 1080 × 463 | 67.8% |
| 32:9 | Trim height | 1080 × 304 | 78.9% |
Solve the missing side
Pick a ratio, then enter the side you know.
Height is 1440. Size 1080 by 1440 pixels.
Size at 3:4
1080 × 1440
Height solved, in pixels.
Your numbers, worked
H = W × 4 ÷ 3 = 1080 × 4 ÷ 3 = 1440
Whole number, so no rounding is needed.
Pixel-exact: a 3:4 size needs the width to be a multiple of 3, and 1080 is 360 × 3.
Questions
What resolutions are 3:4?
360 × 480, 720 × 960, 1080 × 1440, 1440 × 1920 and 2160 × 2880 are exactly 3:4. Any size whose width is a multiple of 3 and whose height is the same multiple of 4 is exact.
How do I work out a 3:4 height from a width?
Multiply the width by 4 and divide by 3: 1080 × 4 ÷ 3 = 1440. The other way, width = height × 3 ÷ 4.
How much of a 3:4 image does a 1.91:1 crop keep?
39.3%. The share kept is the smaller decimal divided by the larger: 0.75 ÷ 1.91. Padding a 3:4 image to 1.91:1 instead fills the same share of the canvas.
Nearby sizes
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Apart from the sourced notes above, which devices use this ratio, and marketing names for it, are not covered: we did not verify a primary source for them, so this page sticks to arithmetic.