Is 800×1280 the same as 5:8?

Yes — divide both sides by 160 (the GCD) to get 5:8. Use aspect-ratio: 5 / 8 and padding-top 160.00% for the legacy fallback.

How do I keep 800×1280 from stretching?

Set aspect-ratio: 5 / 8 on the container and use object-fit: cover (crop-fill) or contain (letterbox). Never stretch via width/height alone.

What aspect ratio is 800×1280?

5:8 (~0.6250:1)

800×1280 simplifies to 5:8 (GCD 160). In decimal that is ~0.6250:1 — a custom 5:8 frame used for 8-inch tablet portrait. The calculator below is preloaded to 5:8 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 5:8 for math.

Ratio W:Ratio H

Width (px)Height (px)

1920 × 3072

Exact ratio: 5:8 · CSS: aspect-ratio: 5 / 8 · padding-top fallback: 160.00%

How the ratio was computed

GCD(800, 1280) = 160

800 ÷ 160 = 5 → 1280 ÷ 160 = 8

→ 5:8 (dec. 0.6250:1) · padding-top 160.00%

CSS: aspect-ratio: 5 / 8

All math is local and instantly invertible — swap width and height and the ratio stays the same, just rotated. URL sharing works: ?w=800&h=1280 style deep-links still resolve via the ratio parameters.

Quick 5:8 partner table

Width	Height (5:8)
640px	1024px
1280px	2048px
1920px	3072px
2560px	4096px
3840px	6144px

Other sizes in 5:8

No other catalogued sizes share 5:8 exactly — the table above covers the common computed variants.

Related lookups

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Tip: designing for 800×1280 tablet portrait? Master at 800×1280 exactly, then export lighter proxies by halving both sides (e.g. 400×640) — the ratio stays 5:8 and downscales stay sharp.