What width is 600 tall at 16:9?

600 x 16 / 9 = 1067px. Use aspect-ratio: 16 / 9.

How to keep 600 tall from stretching?

Set height: 600px paired with the computed width, and aspect-ratio: W / H on the container; use object-fit for inner media.

600 at this size works vertical or horizontal depending on ratio - check the table for portrait inversions like 9:16.

A 600px-tall frame is used in many layouts. The table below lists the exact partner width at every ratio RatioCalc supports.

Ratio	Width for 600	Pair	CSS
16:9	1067px	1067x600	aspect-ratio: 16 / 9
4:3	800px	800x600	aspect-ratio: 4 / 3
1:1	600px	600x600	aspect-ratio: 1 / 1
9:16	338px	338x600	aspect-ratio: 9 / 16
21:9	1400px	1400x600	aspect-ratio: 21 / 9
3:2	900px	900x600	aspect-ratio: 3 / 2
16:10	960px	960x600	aspect-ratio: 16 / 10
4:5	480px	480x600	aspect-ratio: 4 / 5
2:1	1200px	1200x600	aspect-ratio: 2 / 1
239:100	1434px	1434x600	aspect-ratio: 239 / 100
32:9	2133px	2133x600	aspect-ratio: 32 / 9
5:4	750px	750x600	aspect-ratio: 5 / 4
2:3	400px	400x600	aspect-ratio: 2 / 3
18:9	1200px	1200x600	aspect-ratio: 18 / 9
5:3	1000px	1000x600	aspect-ratio: 5 / 3
1:2	300px	300x600	aspect-ratio: 1 / 2

width = 600 x rw / rh

// e.g. 9:16 at 600 tall is 338px

Print tip: at 600px, verify with w = 600 x rw / rh before print - 1px matters on narrow banners.