Is 720×1600 the same as 9:20?

Yes — divide both sides by 80 (the GCD) to get 9:20. Use aspect-ratio: 9 / 20 and padding-top 222.22% for the legacy fallback.

How do I keep 720×1600 from stretching?

Set aspect-ratio: 9 / 20 on the container and use object-fit: cover (crop-fill) or contain (letterbox). Never stretch via width/height alone.

What aspect ratio is 720×1600?

9:20 (~0.4500:1)

720×1600 simplifies to 9:20 (GCD 80). In decimal that is ~0.4500:1 — a custom 9:20 frame used for hd+ 20:9 budget phones. The calculator below is preloaded to 9:20 so you can solve any partner dimension at the same ratio.

No named calculator page covers this exact ratio, but the solver below handles any ratio — treat it as 9:20 for math.

Ratio W:Ratio H

Width (px)Height (px)

1920 × 4267

Exact ratio: 9:20 · CSS: aspect-ratio: 9 / 20 · padding-top fallback: 222.22%

How the ratio was computed

GCD(720, 1600) = 80

720 ÷ 80 = 9 → 1600 ÷ 80 = 20

→ 9:20 (dec. 0.4500:1) · padding-top 222.22%

CSS: aspect-ratio: 9 / 20

All math is local and instantly invertible — swap width and height and the ratio stays the same, just rotated. URL sharing works: ?w=720&h=1600 style deep-links still resolve via the ratio parameters.

Quick 9:20 partner table

Width	Height (9:20)
640px	1422px
1280px	2844px
1920px	4267px
2560px	5689px
3840px	8533px

Other sizes in 9:20

1080×2400 — 1080×2400 20:9 Phone — Modern 20:9 Android
1440×3200 — 1440×3200 QHD+ Phone — QHD+ 20:9 flagships

Related lookups

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Tip: designing for 720×1600 hd+ phone? Master at 720×1600 exactly, then export lighter proxies by halving both sides (e.g. 360×800) — the ratio stays 9:20 and downscales stay sharp.