Aspect Ratio Calculator
Lock a ratio, edit one dimension, the other solves instantly. 16 presets for video, social and cinema — plus the CSS snippet and 30 resolution lookups.
1920 × 1080
Exact ratio: 16:9 · CSS: aspect-ratio: 16 / 9 · padding-top fallback: 56.25%
Ratio calculators
- 16:9 Aspect Ratio Calculator
- 4:3 Aspect Ratio Calculator
- 1:1 Square Calculator
- 9:16 Vertical Calculator
- 21:9 Ultrawide Calculator
- 3:2 Aspect Ratio Calculator
- 16:10 Aspect Ratio Calculator
- 4:5 Portrait Calculator
- 2:1 Aspect Ratio Calculator
- 2.39:1 Cinema Calculator
- 32:9 Super Ultrawide Calculator
- 5:4 Aspect Ratio Calculator
- 2:3 Portrait Photo Calculator
- 18:9 Calculator (2:1 Univisium) — Phone Tall Display
- 5:3 Widescreen Calculator
- 1:2 Tall Portrait Calculator
What aspect ratio is…? (lookup by resolution)
People search by pixels — each lookup simplifies the pair via GCD, names the ratio, and preloads the solver.
- 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
- 2560×1080 — 2560×1080 UW-FHD
- 5120×1440 — 5120×1440 Super UW
- 3840×1080 — 3840×1080 Dual FHD
- 1080×1920 — 1080×1920 Full HD Vertical
- 720×1280 — 720×1280 HD Vertical
- 1080×1080 — 1080×1080 Square
- 1080×1350 — 1080×1350 Portrait 4:5
- 1200×675 — 1200×675 X/Twitter Card
- 1200×628 — 1200×628 OG Image
- 1920×1200 — 1920×1200 WUXGA
- 2560×1600 — 2560×1600 WQXGA
- 1280×1024 — 1280×1024 SXGA 5:4
- 1024×768 — 1024×768 XGA
- 800×600 — 800×600 SVGA
- 640×480 — 640×480 VGA
- 2048×858 — 2048×858 Scope 2.39
- 4096×1716 — 4096×1716 4K Scope
- 1500×500 — 1500×500 X Header
- 1920×1920 — 1920×1920 Square HD
- 6000×4000 — 6000×4000 24MP 3:2
- 4000×6000 — 4000×6000 24MP Portrait
- 2160×1080 — 2160×1080 18:9 Phone
- 1920×1152 — 1920×1152 5:3 Widescreen
- 900×1800 — 900×1800 1:2 Tall
- 1280×800 — 1280×800 WXGA
- 1440×900 — 1440×900 WXGA+
- 1600×900 — 1600×900 HD+
- 1680×1050 — 1680×1050 WSXGA+
- 1920×1440 — 1920×1440 QXGA
- 2048×1152 — 2048×1152 QWXGA
- 3840×1600 — 3840×1600 UW 4K
- 7680×4320 — 7680×4320 8K UHD
- 640×1136 — 640×1136 iPhone 5
- 750×1334 — 750×1334 iPhone 6
- 1125×2436 — 1125×2436 iPhone X
- 1170×2532 — 1170×2532 iPhone 12
- 1284×2778 — 1284×2778 iPhone 12 Pro Max
- 1080×2400 — 1080×2400 20:9 Phone
- 1440×3200 — 1440×3200 QHD+ Phone
- 720×1600 — 720×1600 HD+ Phone
- 800×1280 — 800×1280 Tablet Portrait
- 1024×600 — 1024×600 Netbook
- 1536×2048 — 1536×2048 iPad Portrait
- 1792×828 — 1792×828 iPhone XR
Browse by fixed width or height
Start from one dimension — see every ratio’s partner instantly.
Print sizes — inches and cm at real DPI
Pixels to physical size: inches = pixels / DPI. See every resolution at print.
- 300 DPI - photo prints · 150 DPI - posters
- 1920x1080 print size · 3840x2160 print size
- 1080x1920 print · 6000x4000 print
Platform guides — exact sizes
One page per platform with safe areas and export checklists.
- YouTube thumbnail — 1280x720
- YouTube Shorts — 1080x1920
- Instagram — 1080x1350 / 1080x1080
- TikTok — 1080x1920
- Facebook cover — 851x315
- Facebook post — 1200x630
- LinkedIn banner — 1584x396
- Pinterest pin — 1000x1500
- Open Graph — 1200x630
- CSS aspect-ratio guide
- X header — 1500x500
- Custom ratio — any size
Platform size reference
| Platform | Size | Ratio |
|---|---|---|
| YouTube thumbnail | 1280 × 720 | 16:9 |
| YouTube Shorts | 1080 × 1920 | 9:16 |
| Instagram feed post | 1080 × 1350 | 4:5 |
| Instagram story | 1080 × 1920 | 9:16 |
| TikTok video | 1080 × 1920 | 9:16 |
| X/Twitter card | 1200 × 675 | 16:9 |
Compare ratios side-by-side
Same width vs same height — see letterbox and pillar sizes.
- 16:9 vs 21:9 ultrawide
- 16:9 vs 4:3 classic
- 16:9 vs 1:1 square
- 16:9 vs 9:16 vertical
- 32:9 vs 16:9 super ultrawide
- 2.39:1 vs 16:9 cinema
Frequently asked questions
How do I calculate height from an aspect ratio?
height = width ÷ (ratioW ÷ ratioH). For 1920 wide at 16:9: 1920 ÷ (16÷9) = 1080. The same formula works in reverse for width.
What is the modern CSS way to reserve 16:9 space?
Put aspect-ratio: 16 / 9 on the element. Legacy fallback: a padding-top: 56.25% wrapper with the content absolutely positioned inside. Pair with object-fit: cover.
Why does my video look squashed?
The player forced a different ratio than the content. Match them using the calculator, or letterbox with object-fit: contain so nothing stretches.
What aspect ratio is 1920×1080?
16:9. So is 1280×720, 2560×1440 and 3840×2160 — they all divide to 1.777:1. See the 1920×1080 lookup for the GCD math.