What aspect ratio is 720×1280?
9:16 (~0.5625:1)
720×1280 simplifies to 9:16 (GCD 80). In decimal that is ~0.5625:1 — a standard 9:16 frame used for vertical preview, light shorts. The calculator below is preloaded to 9:16 so you can solve any partner dimension at the same ratio.
→ Open the full 9:16 Vertical Calculator →
:
1920 × 3413
Exact ratio: 9:16 · CSS: aspect-ratio: 9 / 16 · padding-top fallback: 177.78%
How the ratio was computed
GCD(720, 1280) = 80
720 ÷ 80 = 9 → 1280 ÷ 80 = 16
→ 9:16 (dec. 0.5625:1) · padding-top 177.78%
CSS: aspect-ratio: 9 / 16
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=1280 style deep-links still resolve via the ratio parameters.
Quick 9:16 partner table
| Width | Height (9:16) |
|---|---|
| 640px | 1138px |
| 1280px | 2276px |
| 1920px | 3413px |
| 2560px | 4551px |
| 3840px | 6827px |
Other sizes in 9:16
- 1080×1920 — 1080×1920 Full HD Vertical — Shorts, Reels, TikTok, Stories
Related lookups
- 1920×1080 — 1920×1080 Full HD
- 1280×720 — 1280×720 HD
- 3840×2160 — 3840×2160 4K UHD
- 2560×1440 — 2560×1440 QHD
- 1366×768 — 1366×768 WXGA
- 3440×1440 — 3440×1440 UW-QHD
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Tip: designing for 720×1280 hd vertical? Master at 720×1280 exactly, then export lighter proxies by halving both sides (e.g. 360×640) — the ratio stays 9:16 and downscales stay sharp.