Is 640×1136 the same as 40:71?

Yes — divide both sides by 16 (the GCD) to get 40:71. Use aspect-ratio: 40 / 71 and padding-top 177.50% for the legacy fallback.

How do I keep 640×1136 from stretching?

Set aspect-ratio: 40 / 71 on the container and use object-fit: cover (crop-fill) or contain (letterbox). Never stretch via width/height alone.

What aspect ratio is 640×1136?

40:71 (~0.5634:1)

640×1136 simplifies to 40:71 (GCD 16). In decimal that is ~0.5634:1 — a custom 40:71 frame used for iphone 5/se portrait. The calculator below is preloaded to 40:71 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 40:71 for math.

Ratio W:Ratio H

Width (px)Height (px)

1920 × 3408

Exact ratio: 40:71 · CSS: aspect-ratio: 40 / 71 · padding-top fallback: 177.50%

How the ratio was computed

GCD(640, 1136) = 16

640 ÷ 16 = 40 → 1136 ÷ 16 = 71

→ 40:71 (dec. 0.5634:1) · padding-top 177.50%

CSS: aspect-ratio: 40 / 71

All math is local and instantly invertible — swap width and height and the ratio stays the same, just rotated. URL sharing works: ?w=640&h=1136 style deep-links still resolve via the ratio parameters.

Quick 40:71 partner table

Width	Height (40:71)
640px	1136px
1280px	2272px
1920px	3408px
2560px	4544px
3840px	6816px

Other sizes in 40:71

No other catalogued sizes share 40:71 exactly — the table above covers the common computed variants.

Related lookups

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Tip: designing for 640×1136 iphone 5? Master at 640×1136 exactly, then export lighter proxies by halving both sides (e.g. 320×568) — the ratio stays 40:71 and downscales stay sharp.