Title: Paper Sizes, Lines, and Scales
Course: Computer Aided Drafting I > Section: Module 3: Alphabet of Lines

ANSI Paper Size

Name | in × in | mm × mm | Ratio | Alias | Similar ISO A size
ANSI A | 8½ × 11 | ; 216 × 279 | 1.2941 | Letter | A4
ANSI B | 17 × 11 11 × 17 | 432 × 279 279 × 432 | 1.5455 | Ledger Tabloid | A3
ANSI C | 17 × 22 | 432 × 559 | 1.2941 |  | A2
ANSI D | 22 × 34 | 559 × 864 | 1.5455 |  | A1
ANSI E | 34 × 44 | 864 × 1118 | 1.2941 |  | A0

Architectural Paper Size

Name | in × in | mm × mm | Ratio
Arch A | 9 × 12 | 229 × 305 | 3:4
Arch B | 12 × 18 | 305 × 457 | 2:3
Arch C | 18 × 24 | 457 × 610 | 3:4
Arch D | 24 × 36 | 610 × 914 | 2:3
Arch E | 36 × 48 | 914 × 1219 | 3:4
Arch E1 | 30 × 42 | 762 × 1067 | 5:7
Arch E2 | 26 x 38 | 660 x 965 | 13:19
Arch E3 | 27 x 39 | 686 x 991 | 9:13

Metric/ISO Paper Size

Format | A series
Size | mm × mm | in × in
0 | 841 × 1189 | 33.1 × 46.8
1 | 594 × 841 | 23.4 × 33.1
2 | 420 × 594 | 16.5 × 23.4
3 | 297 × 420 | 11.7 × 16.5
4 | 210 × 297 | 8.3 × 11.7
5 | 148 × 210 | 5.8 × 8.3
6 | 105 × 148 | 4.1 × 5.8
7 | 74 × 105 | 2.9 × 4.1
8 | 52 × 74 | 2.0 × 2.9
9 | 37 × 52 | 1.5 × 2.0
10 | 26 × 37 | 1.0 × 1.5

Alphabet of Lines

Scales

How do you convert inches to millimeters?

1 inch = 25.4 millimeters = 2.54 centimeters. So to convert inches to millimeters, multiply the number of inches by 25.4

How do you convert millimeters into inches?

To convert millimeters to inches you divide the number of millimeters by 25.4 Example: 8 mm / 25.4 = 0.31496 inches