Architectural Paper Sizes ANSI
Architectural Paper Sizes
North America also has a special series of paper sizes defined for architectural purposes, in general these have aspect ratios of 4:3 or 3:2. These aspect ratios are very similar to the aspect ratio used for computer screens.
The following table gives details of the sizes for architectural paper.
|Size||Width x Height (mm)||Width x Height (in)||Aspect Ratio|
|Arch A||229 x 305 mm||9.0 x 12.0 in||4:3|
|Arch B||305 x 457 mm||12.0 x 18.0 in||3:2|
|Arch C||457 x 610 mm||18.0 x 24.0 in||4:3|
|Arch D||610 x 914 mm||24.0 x 36.0 in||3:2|
|Arch E||914 x 1219 mm||36.0 x 48.0 in||4:3|
|Arch E1||762 x 1067 mm||30.0 x 42.0 in||7:5|
ANSI Standard Paper Sizes
ANSI (American National Standards Insitute) defined a regular series of paper sizes based around the Letter (8.5" x 11") format, with this becoming the A sizes and larger sizes being B,C,D & E. Surprisingly these ANSI standard sizes were defined in 1995 well after the ISO standard sizes.
Unlike the ISO standard sizes which have the single aspect ratio of 1:root2, ANSI standard sizes have two aspect ratios 1:1.2941 and 1:1.5455 which means that enlarging and reducing between the sizes is not as easy as with the ISO sizes and leaves wider margins on the enlarged/reduced document.
|Size||Width x Height (mm)||Width x Height (in)||Aspect Ratio||Nearest ISO|
|A||216 x 279 mm||8.5 x 11.0 in||1:1.2941||A4|
|B||279 x 432 mm||11.0 x 17.0 in||1:1.5455||A3|
|C||432 x 559 mm||17.0 x 22.0 in||1:1.2941||A2|
|D||559 x 864 mm||22.0 x 34.0 in||1:1.5455||A1|
|E||864 x 1118 mm||34.0 x 44.0 in||1:1.2941||A0|