Aspect Ratio Calculator1080x1350 at a glance
| Simplified ratio | 4:5 |
|---|---|
| Decimal (width ÷ height) | 0.8:1 |
| Written as x:9 | 9:11.25 |
| Closest standard ratio | exactly 4:5 (Instagram portrait) |
| Megapixels | 1.46 MP (1,458,000 pixels) |
| Pixels compared with 1920 × 1080 | 0.7× |
| Orientation | Portrait |
| CSS | aspect-ratio: 4 / 5; |
| Padding-top trick | padding-top: 125%; |
What is 1080x1350 used for?
The classic portrait format for Instagram feed photos, also used on Facebook and LinkedIn. On a phone it fills more of the screen than a square post. Since 2025 Instagram also accepts slightly taller 3:4 posts (1080 × 1440).
Platform formats that use exactly 1080 × 1350: Instagram posts (Portrait), Facebook posts (Portrait), and LinkedIn post images (Portrait)
How the ratio is calculated
Divide both sides by their greatest common divisor (GCD). The GCD of 1080 and 1350 is 270, so 1080 ÷ 270 = 4 and 1350 ÷ 270 = 5, which gives 4:5. In CSS that is aspect-ratio: 4 / 5; with the older padding trick the height is 125% of the width.
Same-ratio sizes (4:5)
1080x1350 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 |
|---|---|---|
| ≈ 270 × 338 | 25% | 0.09 |
| 360 × 450 | 33.3% | 0.16 |
| 540 × 675 | 50% | 0.36 |
| 720 × 900 | 66.7% | 0.65 |
| ≈ 810 × 1013 | 75% | 0.82 |
| 1080 × 1350 | 100% | 1.46 |
| 1440 × 1800 | 133.3% | 2.59 |
| 1620 × 2025 | 150% | 3.28 |
| 2160 × 2700 | 200% | 5.83 |
| 3240 × 4050 | 300% | 13.12 |
| 4320 × 5400 | 400% | 23.33 |
Nearby common sizes
- 1080 × 1080 1:1 · Square post
- 1080 × 1920 9:16 · Vertical Full HD
- 750 × 1334 ≈ 9:16 · iPhone 6/7/8 and SE
- 1440 × 900 8:5 · WXGA+
Frequently asked questions
What is the aspect ratio of 1080x1350?
1080 × 1350 has an aspect ratio of 4:5. The greatest common divisor of 1080 and 1350 is 270; dividing both sides by it gives 4:5. As a decimal that is 0.8:1.
How many megapixels is 1080x1350?
1080 × 1350 contains 1,458,000 pixels, or 1.46 megapixels. That is 0.7× the pixel count of 1920 × 1080 (Full HD).
Which sizes have the same aspect ratio as 1080x1350?
Exact scaled versions include 360 × 450, 540 × 675, 720 × 900, 1440 × 1800, 1620 × 2025, 2160 × 2700, 3240 × 4050, and 4320 × 5400. Any size of the form 4n × 5n has exactly the same shape.
How do I resize an image to 1080x1350 without distortion?
Crop it to 4:5 first, then scale it to 1080 × 1350. For any width W the matching height is W × 5 ÷ 4. 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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