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Arch A

9 x 12 inch
/
228.6 x 304.8 mm

The Arch A paper size measures 9 inches wide by 12 inches tall, giving it a modest surface area of 108 square inches. Arch A is the smallest size in the architectural paper system defined by ANSI for use in architecture and construction. Its 4:3 aspect ratio makes Arch A similar in shape to photo prints, modern computer displays, and the architectural standard Arch D. The 9x12 dimensions allow Arch A to fit easily in folders and binders for portability. Common uses include preliminary architectural sketches, detailed plans not needing a large drawing area, and component details to accompany larger drawings. The rectangular shape of Arch A is convenient for perspective drawings requiring more vertical space. Its size also makes Arch A a useful alternative to the A4 size for general office use in North America.

All US Paper Sizes
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Letter
in
8.5 x 11
Legal
in
8.5 x 14
Tabloid
in
11 x 17
Ledger
in
17 x 11
Executive
in
7.3 x 10.5
Half Letter
in
5.5 x 8.5
Statement
in
5.5 x 8.5
Junior Legal
in
5 x 8
Government Letter
in
8 x 10
Government Legal
in
8.5 x 13
ANSI A
in
8.5 x 11
ANSI B
in
11 x 17
ANSI C
in
17 x 22
ANSI D
in
22 x 34
ANSI E
in
34 x 44
Arch A
in
9 x 12
Arch B
in
12 x 18
Arch C
in
18 x 24
Arch D
in
24 x 36
Arch E
in
36 x 48
Arch E1
in
30 x 42
Arch E2
in
26 x 38
Arch E3
in
27 x 39
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