Smallest whole-pixel size 191 × 100.
In CSS: aspect-ratio: 1.91 / 1. Rotated it becomes 1:1.91.
Where 1.91:1 is used
Open Graph link previews, Facebook and LinkedIn post images.
Not a display standard at all — a social-platform convention that stuck because Facebook picked it for link cards.
Rendered live with aspect-ratio: 1.91 / 1.
1.91:1 resolutions
Every size below is exactly 1.91:1 — no rounding. Sizes marked as a standard are named display resolutions.
| Resolution | Width | Height | Megapixels | Standard |
|---|---|---|---|---|
| 191 × 100 | 191 | 100 | 0.02 | — |
| 382 × 200 | 382 | 200 | 0.08 | — |
| 573 × 300 | 573 | 300 | 0.17 | — |
| 764 × 400 | 764 | 400 | 0.31 | — |
| 955 × 500 | 955 | 500 | 0.48 | — |
| 1146 × 600 | 1146 | 600 | 0.69 | — |
| 1337 × 700 | 1337 | 700 | 0.94 | — |
| 1528 × 800 | 1528 | 800 | 1.22 | — |
| 1719 × 900 | 1719 | 900 | 1.55 | — |
| 1910 × 1000 | 1910 | 1000 | 1.91 | — |
| 2101 × 1100 | 2101 | 1100 | 2.31 | — |
| 2292 × 1200 | 2292 | 1200 | 2.75 | — |
| 2483 × 1300 | 2483 | 1300 | 3.23 | — |
| 2674 × 1400 | 2674 | 1400 | 3.74 | — |
| 2865 × 1500 | 2865 | 1500 | 4.3 | — |
| 3056 × 1600 | 3056 | 1600 | 4.89 | — |
| 3247 × 1700 | 3247 | 1700 | 5.52 | — |
| 3438 × 1800 | 3438 | 1800 | 6.19 | — |
| 3629 × 1900 | 3629 | 1900 | 6.9 | — |
| 3820 × 2000 | 3820 | 2000 | 7.64 | — |
| 4011 × 2100 | 4011 | 2100 | 8.42 | — |
| 4202 × 2200 | 4202 | 2200 | 9.24 | — |
| 4393 × 2300 | 4393 | 2300 | 10.1 | — |
| 4584 × 2400 | 4584 | 2400 | 11 | — |
| 4775 × 2500 | 4775 | 2500 | 11.94 | — |
| 4966 × 2600 | 4966 | 2600 | 12.91 | — |
| 5157 × 2700 | 5157 | 2700 | 13.92 | — |
| 5348 × 2800 | 5348 | 2800 | 14.97 | — |
| 5539 × 2900 | 5539 | 2900 | 16.06 | — |
| 5730 × 3000 | 5730 | 3000 | 17.19 | — |
| 5921 × 3100 | 5921 | 3100 | 18.36 | — |
| 6112 × 3200 | 6112 | 3200 | 19.56 | — |
| 6303 × 3300 | 6303 | 3300 | 20.8 | — |
| 6494 × 3400 | 6494 | 3400 | 22.08 | — |
| 6685 × 3500 | 6685 | 3500 | 23.4 | — |
| 6876 × 3600 | 6876 | 3600 | 24.75 | — |
| 7067 × 3700 | 7067 | 3700 | 26.15 | — |
| 7258 × 3800 | 7258 | 3800 | 27.58 | — |
| 7449 × 3900 | 7449 | 3900 | 29.05 | — |
| 7640 × 4000 | 7640 | 4000 | 30.56 | — |
Using 1.91:1 in CSS
/* Modern — one line */
.box { aspect-ratio: 1.91 / 1; }
/* With a fixed width */
.box { width: 100%; max-width: 955px; aspect-ratio: 1.91 / 1; }
/* Legacy padding-top hack, if you still need it */
.box-legacy { position: relative; }
.box-legacy::before { content: ""; display: block; padding-top: 52.356%; }
.box-legacy > * { position: absolute; inset: 0; }Questions about 1.91:1
What resolution is 1.91:1?
1.91:1 is a ratio, not a fixed resolution — any size where width ÷ height equals 1.91 qualifies. The smallest whole-pixel pair is 191 × 100, and common ones include 764 × 400, 955 × 500, 1146 × 600, 1337 × 700.
What is 1.91:1 used for?
Open Graph link previews, Facebook and LinkedIn post images.
How do I set 1.91:1 in CSS?
Use the aspect-ratio property: aspect-ratio: 1.91 / 1;. The element then keeps that shape at any width. It is supported in every current browser.
What is 1.91:1 the other way round?
Rotated 90 degrees it becomes 1:1.91.
How do I calculate a 1.91:1 height from a width?
Multiply the width by 0.52356. For example 1146 × 0.52356 = 600. The calculator does it both directions.