1080x1920 aspect ratio: 9:16 (1:1.778)
1080 × 1920 reduces to 9:16. The greatest common divisor of 1080 and 1920 is 120, so 1080 ÷ 120 = 9 and 1920 ÷ 120 = 16. That is exactly 9:16.
Published · Updated · Sources last verified
At a glance
9:16
1080 × 1920 is exactly 9:16.
- Decimal
- 1:1.778
- Nearest named ratio
- 9:16, exact
- Orientation
- Portrait
- Pixels
- 2,073,600
- Megapixels
- 2.07
- Greatest common divisor
- 120
How 1080 × 1920 reduces
- 1920 = 1 × 1080 + 840
- 1080 = 1 × 840 + 240
- 840 = 3 × 240 + 120
- 240 = 2 × 120 + 0
The last divisor, 120, is the greatest common divisor, so 1080 × 1920 reduces to 9:16. The method by hand is on the calculator page.
Crop or pad 1080 × 1920 to common ratios
Whole-pixel downscales
| Divide by | Size | Whole pixels | Nearest whole size |
|---|---|---|---|
| ÷2 | 540 × 960 | yes | same |
| ÷3 | 360 × 640 | yes | same |
| ÷4 | 270 × 480 | yes | same |
| ÷5 | 216 × 384 | yes | same |
| ÷6 | 180 × 320 | yes | same |
| ÷8 | 135 × 240 | yes | same |
| ÷10 | 108 × 192 | yes | same |
Nearest listed ratios
| Size | Reduced ratio | Decimal | Difference from 1080 × 1920 |
|---|---|---|---|
| 1080 × 1920this page's size | 9:16 | 1:1.778 | - |
| 1080 × 1350 | 4:5 | 1:1.25 | 42.2% |
| 1280 × 1024 | 5:4 | 1.25:1 | 122.2% |
| 1440 × 1080 | 4:3 | 1.333:1 | 137% |
Facts about 1080 × 1920
- 1080 × 1920 is exactly 9:16: 120 × 9 by 120 × 16.
- 1080 × 1920 divides into whole pixels by 2, 3, 4, 5, 6, 8 and 10, so a one-third size (360 × 640) is still whole pixels.
- Turned on its side, 1080 × 1920 becomes 1920 × 1080 (16:9).
- Cropped to 16:9, 1080 × 1920 keeps 31.7% (1080 × 608); cropped to 4:5 it keeps 70.3% (1080 × 1350).
- 1080 × 1920 is 2,073,600 pixels (2.07 MP), the same pixel count as 1920 × 1080, turned on its side.
Sourced notes
Meta's ads guide recommends 1440 × 2560 for Instagram Stories and Reels image ads. 1080 × 1920 is the same 9:16 shape at 75% of the size (our arithmetic).
Source: Meta Ads Guide: Instagram Stories image ads; Meta Ads Guide: Instagram Reels image ads. Last verified 2026-10-05.
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Aspect ratio 9:16 (1:1.778). Exact match for 9:16.
Aspect ratio
9:16
1:1.778
Exact match for 9:16.
- Width ÷ height
- 0.5625
- Height ÷ width
- 1.7778
- Shape
- portrait
Your numbers, worked
gcd(1080, 1920) = 120
1080 ÷ 120 = 9
1920 ÷ 120 = 16
1080 ÷ 1920 = 0.5625
Show how the gcd was found
- 1920 = 1 × 1080 + 840
- 1080 = 1 × 840 + 240
- 840 = 3 × 240 + 120
- 240 = 2 × 120 + 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 × 1920
The largest centred crop at each ratio, best fit first. Crop rather than stretch.
| Ratio | Fit | Crop to | Lost |
|---|---|---|---|
| 9:16 | Exact | 1080 × 1920 | 0% |
| 2:3 | Trim height | 1080 × 1620 | 15.6% |
| 3:4 | Trim height | 1080 × 1440 | 25% |
| 4:5 | Trim height | 1080 × 1350 | 29.7% |
| 1:1 | Trim height | 1080 × 1080 | 43.8% |
| 5:4 | Trim height | 1080 × 864 | 55% |
| 4:3 | Trim height | 1080 × 810 | 57.8% |
| 3:2 | Trim height | 1080 × 720 | 62.5% |
| 16:10 | Trim height | 1080 × 675 | 64.8% |
| 16:9 | Trim height | 1080 × 608 | 68.3% |
| 1.91:1 | Trim height | 1080 × 565 | 70.6% |
| 2:1 | Trim height | 1080 × 540 | 71.9% |
| 21:9 | Trim height | 1080 × 463 | 75.9% |
| 32:9 | Trim height | 1080 × 304 | 84.2% |
Solve the missing side
Pick a ratio, then enter the side you know.
Height is 1920. Size 1080 by 1920 pixels.
Size at 9:16
1080 × 1920
Height solved, in pixels.
Your numbers, worked
H = W × 16 ÷ 9 = 1080 × 16 ÷ 9 = 1920
Whole number, so no rounding is needed.
Pixel-exact: a 9:16 size needs the width to be a multiple of 9, and 1080 is 120 × 9.
Questions
What aspect ratio is 1080x1920?
1080 × 1920 is 9:16 (1:1.778). Dividing both sides by their greatest common divisor, 120, gives 9 and 16. That is exactly 9:16.
How do I resize 1080x1920 without distortion?
Keep the ratio at 9:16: new height = new width × 16 ÷ 9. Dividing both sides by 2, 3, 4, 5, 6, 8 or 10 keeps whole pixels, for example 108 × 192 at ÷10.
What is 1080x1920 cropped to 16:9?
A centered 16:9 crop of 1080 × 1920 is 1080 × 608, which keeps 31.7% of the image. Padding it to 16:9 instead gives a 3413 × 1920 canvas with 2,333 px of bars. That canvas is rounded, not exactly 16:9: the exact padded side would be 3413.33 px wide. The smallest exact 16:9 canvas around it is 3424 × 1926.
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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.