ARCH A Paper Size
ARCH A measures 9 × 12 inches (228.6 × 304.8 mm). It is a large-format drawing size, an architectural size.
| Inches | 9 × 12 in |
|---|---|
| Millimetres | 228.6 × 304.8 mm |
| Centimetres | 22.9 × 30.5 cm |
| Aspect ratio (long ÷ short) | 1.333 |
| Area | 0.0697 m² |
| Resolution | Width × height | Typical use |
|---|---|---|
| 72 PPI | 648 × 864 px | Screen design (PDF points) |
| 96 PPI | 864 × 1152 px | Web / CSS pixels |
| 150 PPI | 1350 × 1800 px | Draft print quality |
| 300 PPI | 2700 × 3600 px | High-quality print |
| Print onto | Scale |
|---|---|
| A5 paper | 64.7% |
| A4 paper | 91.9% |
| A3 paper | 129.9% |
| Letter paper | 91.7% |
| Legal paper | 94.4% |
Where you will see ARCH A
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 A 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 A?
ARCH A is 9 × 12 inches (228.6 × 304.8 mm).
How big is ARCH A compared with Letter?
ARCH A has 1.2 times the area of Letter.
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Last updated: 2026-10-03