ARCH C Paper Size
ARCH C measures 18 × 24 inches (457.2 × 609.6 mm). It is a large-format drawing size, an architectural size.
| Inches | 18 × 24 in |
|---|---|
| Millimetres | 457.2 × 609.6 mm |
| Centimetres | 45.7 × 61 cm |
| Aspect ratio (long ÷ short) | 1.333 |
| Area | 0.2787 m² |
| Resolution | Width × height | Typical use |
|---|---|---|
| 72 PPI | 1296 × 1728 px | Screen design (PDF points) |
| 96 PPI | 1728 × 2304 px | Web / CSS pixels |
| 150 PPI | 2700 × 3600 px | Draft print quality |
| 300 PPI | 5400 × 7200 px | High-quality print |
| Print onto | Scale |
|---|---|
| A5 paper | 32.4% |
| A4 paper | 45.9% |
| A3 paper | 65.0% |
| Letter paper | 45.8% |
| Legal paper | 47.2% |
Where you will see ARCH C
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 C 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 C?
ARCH C is 18 × 24 inches (457.2 × 609.6 mm).
How big is ARCH C compared with Letter?
ARCH C has 4.6 times the area of Letter.
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Last updated: 2026-10-03