REVIT TUTOR 229 x 305 mm
9.0 x 12.0 in
Aspect Ratio 4:3
ARCH A
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.
305 x 457 mm
12.0 x 18.0 in
Aspect Ratio 3:2
ARCH B
457 x 610 mm
18.0 x 24.0 in
Aspect Ratio 4:3
ARCH C
610 x 914 mm
24.0 x 36.0 in
Aspect Ratio 3:2
ARCH D
914 x 1219 mm
36.0 x 48.0 in
Aspect Ratio 4:3
ARCH E
762 x 1067 mm
30.0 x 42.0 in
Aspect Ratio 7:5
ARCH E1
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
216 x 279 mm
8.5 x 11.0 in
Aspect Ratio 1:1.2941
A / A4
279 x 432 mm
11.0 x 17.0 in
Aspect Ratio 1:1.5455
B / A3
432 x 559 mm
17.0 x 22.0 in
Aspect Ratio 1:1.2941
C / A2
559 x 864 mm
22.0 x 34.0 in
Aspect Ratio 1:1.5455
D / A1
864 x 1118 mm
34.0 x 44.0 in
1:1.2941
E / A0