1:2 Tall Portrait Calculator
1:2 tall portrait — twice as tall as wide. For narrow banners, door wraps and vertical signage.
1:2 (0.5:1) is the narrow tall strip: 600×1200, 900×1800 banners, door wraps, pillar signage and phone-screen mock split views. Height is exactly double width. The solver avoids the classic half-pixel rounding that leaves a 1px seam in signage prints.
1920 × 3840
Exact ratio: 1:2 · CSS: aspect-ratio: 1 / 2 · padding-top fallback: 200.00%
Formula
height = width × 2 ÷ 1
width = height × 1 ÷ 2
// padding-top fallback: 200.00% — keeps layout stable before the image loads
aspect-ratio: 1 / 2 — modern replacement for the padding hack
All math runs locally in your browser. No upload. Type either side, the other solves live — and the URL updates so you can share an exact pair (?w=1920&rw=1&rh=2) or bookmark a preset.
Common 1:2 resolutions
| Width | Height | Use |
|---|---|---|
| 320px | 640px | |
| 640px | 1280px | |
| 1280px | 2560px | |
| 1920px | 3840px | |
| 2560px | 5120px | |
| 3840px | 7680px | 4K |
| 5120px | 10240px | |
| 7680px | 15360px |
Exact known sizes in this ratio
- 900×1800 — 900×1800 1:2 Tall (Pillar banner, vertical signage)
When to use 1:2
- Narrow vertical banners & pillar wraps
- Door/column signage
- Half-screen phone mock (split view)
Pitfalls to avoid
- In signage, confirm bleed and seam allowance — do not ship exactly 1:2 without bleed
- At small sizes 1:2 text wraps poorly — test copy fit early
CSS snippet
Modern:
.frame { aspect-ratio: 1 / 2; width: 100%; overflow: hidden; }
.frame > img { width: 100%; height: 100%; object-fit: cover; }Legacy padding hack (for very old browsers):
.wrap { position: relative; width: 100%; padding-top: 200.00%; }
.wrap > * { position: absolute; inset: 0; }Pair with object-fit: contain to letterbox without cropping, or cover to fill and crop safely.
Platform reference
Frequently asked
What is 1:2 at 900 wide?
900×1800 — height doubles the width.
Is 1:2 the same as 9:18?
Yes — multiply both sides by 9. Same shape.
When should I use 1:2?
Narrow vertical formats: pillar banners, door wraps, or splitting a 1:1 square into two side-by-side tall strips.
Tip: add ?w=1920 or ?h=1080 to this URL to prefill the calculator — useful for linking from a spec doc.
Other ratios
- 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
Look up by resolution
- 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
What aspect ratio is 1920×1080? → · Full FAQ →