There are two main paper size standards in use around the world: the international (ISO) A series and the North American ANSI sizes. North American architects typically use the ARCH sizes for their large format drawings.
North American Loose Paper Sizes
SIZE
INCHES
MILLIMETERS
Letter
8.5 x 11
216 × 279
Legal
8.5 x 14
216 x 356
Tabloid
11 x 17
279 x 432
Ledger
17 x 11
432 x 279
North American ARCH Series Paper Size
SIZE
INCHES
MILLIMETERS
ARCH A
9 x 12
229 x 305
ARCH B
12 x 18
305 x 457
ARCH C
18 x 24
457 x 610
ARCH D
24 x 36
610 x 914
ARCH E1
30 x 42
762 x 1067
ARCH E
36 x 48
914 x 1219
North American ANSI Series Paper Sizes
SIZE
INCHES
MILLIMETERS
ANSI A
8.5 x 11
216 x 279
ANSI B
11 x 17
279 x 432
ANSI C
17 x 22
432 x 559
ANSI D
22 x 34
559 x 864
ANSI E
34 x 44
864 x 1118
International ISO 216 A-Series Paper Sizes
SIZE
INCHES
MILLIMETERS
A0
33.1 x 46.8
841 x 1189
A1
23.4 x 33.1
594 x 841
A2
16.5 x 23.4
420 x 594
A3
11.7 x 16.5
297 x 420
A4
8.3 x 11.7
210 x 297
A5
5.8 x 8.3
148 x 210
A6
4.1 x 5.8
105 x 148
A7
2.9 x 4.1
74 x 105
A8
2.0 x 2.9
52 x 74
A9
1.5 x 2.0
37 x 52
A10
1.0 x 1.5
26 x 37
Article Updated: February 4, 2021
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