ARCH B Paper Size
ARCH B measures 12 × 18 inches (304.8 × 457.2 mm). It is a large-format drawing size, an architectural size.
| Inches | 12 × 18 in |
|---|---|
| Millimetres | 304.8 × 457.2 mm |
| Centimetres | 30.5 × 45.7 cm |
| Aspect ratio (long ÷ short) | 1.500 |
| Area | 0.1394 m² |
| Resolution | Width × height | Typical use |
|---|---|---|
| 72 PPI | 864 × 1296 px | Screen design (PDF points) |
| 96 PPI | 1152 × 1728 px | Web / CSS pixels |
| 150 PPI | 1800 × 2700 px | Draft print quality |
| 300 PPI | 3600 × 5400 px | High-quality print |
| Print onto | Scale |
|---|---|
| A5 paper | 45.9% |
| A4 paper | 65.0% |
| A3 paper | 91.9% |
| Letter paper | 61.1% |
| Legal paper | 70.8% |
Where you will see ARCH B
The architectural series is used for building plans, elevations and construction drawings in North America. Each step up is larger than the last, from ARCH A (9 × 12 in) up to ARCH E (36 × 48 in).
Printing it on smaller paper
Large-format sheets are usually plotted on wide-format printers. If you only need a reference copy, the table above shows the scale at which a ARCH B page fits on A3, A4 or Letter paper. Text and fine lines can become hard to read at small scales, so check a test print.
Frequently asked questions
What are the dimensions of ARCH B?
ARCH B is 12 × 18 inches (304.8 × 457.2 mm).
How big is ARCH B compared with Letter?
ARCH B has 2.3 times the area of Letter.
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Last updated: 2026-10-03