Is 1366×768 the same as 683:384?

Yes — divide both sides by 2 (the GCD) to get 683:384. Use aspect-ratio: 683 / 384 and padding-top 56.22% for the legacy fallback.

How do I keep 1366×768 from stretching?

Set aspect-ratio: 683 / 384 on the container and use object-fit: cover (crop-fill) or contain (letterbox). Never stretch via width/height alone.

What aspect ratio is 1366×768?

683:384 (~1.7786:1)

1366×768 simplifies to 683:384 (GCD 2). In decimal that is ~1.7786:1 — a custom 683:384 frame used for budget laptops, legacy hd. The calculator below is preloaded to 683:384 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 683:384 for math.

Ratio W:Ratio H

Width (px)Height (px)

1920 × 1079

Exact ratio: 683:384 · CSS: aspect-ratio: 683 / 384 · padding-top fallback: 56.22%

How the ratio was computed

GCD(1366, 768) = 2

1366 ÷ 2 = 683 → 768 ÷ 2 = 384

→ 683:384 (dec. 1.7786:1) · padding-top 56.22%

CSS: aspect-ratio: 683 / 384

All math is local and instantly invertible — swap width and height and the ratio stays the same, just rotated. URL sharing works: ?w=1366&h=768 style deep-links still resolve via the ratio parameters.

Quick 683:384 partner table

Width	Height (683:384)
640px	360px
1280px	720px
1920px	1079px
2560px	1439px
3840px	2159px

Other sizes in 683:384

No other catalogued sizes share 683:384 exactly — the table above covers the common computed variants.

Related lookups

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Tip: designing for 1366×768 wxga? Master at 1366×768 exactly, then export lighter proxies by halving both sides (e.g. 683×384) — the ratio stays 683:384 and downscales stay sharp.