ARCH B paper size
304.8 × 457.2 mm
12 × 18 inches · 30.48 × 45.72 cm · aspect ratio 1:1.5
What ARCH B is for
ARCH B is 12 × 18 inches and exists mostly as the half-size print of ARCH D. That relationship is exact — B is precisely half of D in each direction — so a drawing plotted at quarter-inch scale on D reads at eighth-inch scale on B, and a contractor can still scale off the print provided the reduced scale is noted. This is the reason field sets are so often issued at 12 × 18: it fits a clipboard, survives a site, and prints on a machine that costs a tenth of a plotter.
ARCH B in every unit
| Unit | Width | Height |
|---|---|---|
| Millimetres | 304.8 mm | 457.2 mm |
| Centimetres | 30.48 cm | 45.72 cm |
| Inches | 12 in | 18 in |
| Points (PostScript) | 864 pt | 1296 pt |
ARCH B in pixels
Pixel dimensions depend entirely on the resolution you are working at — there is no single "pixel size" for a sheet of paper.
| Resolution | Pixels | Use |
|---|---|---|
| 72 DPI | 864 × 1296 | Screen preview only — far too coarse to print |
| 150 DPI | 1800 × 2700 | Draft printing, internal documents |
| 300 DPI | 3600 × 5400 | The standard for commercial print |
| 600 DPI | 7200 × 10800 | Fine detail, line art, archival scanning |
Setting up a print document? Use 300 DPI and add 3 mm of bleed on every edge unless your printer specifies otherwise.
How ARCH B relates to the rest of the series
About ARCH B
12 × 18 inches, two ARCH A sheets.
Other Architectural sizes
| Size | Millimetres | Inches |
|---|---|---|
| ARCH A | 228.6 × 304.8 mm | 9 × 12 in |
| ARCH C | 457.2 × 609.6 mm | 18 × 24 in |
| ARCH D | 609.6 × 914.4 mm | 24 × 36 in |
| ARCH E | 914.4 × 1219.2 mm | 36 × 48 in |
| ARCH E1 | 762 × 1066.8 mm | 30 × 42 in |
Frequently asked questions
What size is ARCH B in mm?
304.8 × 457.2 mm.
What size is ARCH B in inches?
12 × 18 inches.
What size is ARCH B in pixels?
There is no single answer — it depends on resolution. At the print standard of 300 DPI it is 3600 × 5400 pixels; at 72 DPI it is only 864 × 1296.