What aspect ratio is 3840×2160?
16:9 (~1.7778:1)
3840×2160 simplifies to 16:9 (GCD 240). In decimal that is ~1.7778:1 — a standard 16:9 frame used for 4k masters, high-res display. The calculator below is preloaded to 16:9 so you can solve any partner dimension at the same ratio.
→ Open the full 16:9 Aspect Ratio Calculator →
:
1920 × 1080
Exact ratio: 16:9 · CSS: aspect-ratio: 16 / 9 · padding-top fallback: 56.25%
How the ratio was computed
GCD(3840, 2160) = 240
3840 ÷ 240 = 16 → 2160 ÷ 240 = 9
→ 16:9 (dec. 1.7778:1) · padding-top 56.25%
CSS: aspect-ratio: 16 / 9
All math is local and instantly invertible — swap width and height and the ratio stays the same, just rotated. URL sharing works: ?w=3840&h=2160 style deep-links still resolve via the ratio parameters.
Quick 16:9 partner table
| Width | Height (16:9) |
|---|---|
| 640px | 360px |
| 1280px | 720px |
| 1920px | 1080px |
| 2560px | 1440px |
| 3840px | 2160px |
Other sizes in 16:9
- 1920×1080 — 1920×1080 Full HD — YouTube, Blu-ray, game capture
- 1280×720 — 1280×720 HD — YouTube thumbnail, HD streaming
- 2560×1440 — 2560×1440 QHD — Gaming monitors, 1440p streaming
- 1200×675 — 1200×675 X/Twitter Card — X/Twitter link card
- 1600×900 — 1600×900 HD+ — 16:9 HD+ laptops
Related lookups
- 1920×1080 — 1920×1080 Full HD
- 1280×720 — 1280×720 HD
- 2560×1440 — 2560×1440 QHD
- 1366×768 — 1366×768 WXGA
- 3440×1440 — 3440×1440 UW-QHD
- 2560×1080 — 2560×1080 UW-FHD
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Tip: designing for 3840×2160 4k uhd? Master at 3840×2160 exactly, then export lighter proxies by halving both sides (e.g. 1920×1080) — the ratio stays 16:9 and downscales stay sharp.