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Find the aspect ratio of any size, resize while keeping the ratio, and see common ratios like 16:9, 4:3 and 9:16.
Also covers: Image aspect-ratio calculator · Screen-ratio calculator · 16:9 calculator
Resize, keeping the ratio — fill one:
Aspect ratio
16:9
1.77778 : 1 — HD video, YouTube, most TVs and monitors
Decimal
1.7778
Orientation
Landscape
Resized
1,280 × 720
Working
.media { aspect-ratio: 16 / 9; width: 100%; object-fit: cover;}Common ratios at 1,920 wide
| Ratio | Height | Used for |
|---|---|---|
| 1:1 | 1,920 | Square: profile photos, Instagram |
| 5:4 | 1,536 | Large-format photos, old monitors |
| 4:3 | 1,440 | Classic TV, iPad, most compact cameras |
| 3:2 | 1,280 | 35 mm film, DSLRs, Surface |
| 16:10 | 1,200 | Laptops and monitors (1920 × 1200) |
| 16:9 | 1,080 | HD video, YouTube, most TVs and monitors |
| 1.85:1 | 1,037.84 | Cinema (flat) |
| 2:1 | 960 | Univisium, many phone screens |
| 64:27 | 810 | “21:9” ultrawide at 2560 × 1080 |
| 43:18 | 803.721 | “21:9” ultrawide at 3440 × 1440; ≈ cinema scope (2.39:1) |
| 9:16 | 3,413.33 | Vertical video: Stories, Reels, TikTok, Shorts |
| 4:5 | 2,400 | Portrait posts (Instagram) |
| 2:3 | 2,880 | Portrait photos, Pinterest |
Any unit — pixels, inches, centimetres.
Enter a new width or height to get the other side at the same ratio.
Width and height are divided by their greatest common divisor: 1920 × 1080 → 16:9.
No — it's a marketing name. 2560 × 1080 screens are 64:27 (2.37:1) and 3440 × 1440 ones 43:18 (2.39:1).
Use aspect-ratio: 16 / 9 on the element; the tool gives the snippet.
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