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

SizeInchesMillimeters
Letter8.5 × 11216 × 279
Legal8.5 × 14216 × 356
Tabloid11 × 17279 × 432
Ledger17 × 11432 × 279

North American ARCH Series Paper Size

SizeInchesMillimeters
ARCH A9 x 12229 × 305
ARCH B12 x 18305 × 457
ARCH C18 x 24457 × 610
ARCH D24 x 36610 × 914
ARCH E36 x 48914 × 1219
ARCH E130 x 42762 × 1067
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North American ANSI Series Paper Sizes

SizeInchesMillimeters
ANSI A8.5 × 11216 × 279
ANSI B11 × 17279 × 432
ANSI C17 × 22432 × 559
ANSI D22 × 34559 × 864
ANSI E34 × 44864 × 1118

International ISO 216 A-Series Paper Sizes

SizeInchesMillimeters
A033.1 × 46.8841 × 1189
A123.4 × 33.1594 × 841
A216.5 × 23.4420 × 594
A311.7 × 16.5297 × 420
A48.3 × 11.7210 × 297
A55.8 × 8.3148 × 210
A64.1 × 5.8105 × 148
A72.9 × 4.174 × 105
A82.0 × 2.952 × 74
A91.5 × 2.037 × 52
A101.0 × 1.526 × 37
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