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Paper Sizes

ISO paper dimensions provide a standardized international format based on metric dimensions. The basic size, A0, contains one square metre of paper, allowing all sizes to be commonly measured on the basis of grams per square metre. The proportion between the two sides of the sheet is specified as the square root of 2, or 1:1.4142. This ratio permits all sheets in the series to be an exact multiple of the sheet size above and below it. For example, A0 cut in half creates exactly two A1 sheets.

A series

The A series is the industry standard for the international metric market. Each size is exactly 1/2 the area of the previous size. The most common sizes for publication are A4 and A3 which folds in half to A4.

A series paper sizes

Size

Millimetres

Decimal Inches

Nearest 1/16"

841 x 1189

33.11 x 46.81

33 1/8 x 46 13/16

594 x 841

23.39 x 33.11

23 3/8 x 33 1/8

420 x 594

16.54 x 23.39

16 9/16 x 23 3/8

297 x 420

11.69 x 16.54

11 11/16 x 16 9/16

210 x 297

8.27 x 11.69

8 1/4 x 11 11/16

148 x 210

5.83 x 8.27

5 13/16 x 8 1/4

105 x 148

4.13 x 5.83

4 1/8 x 5 13/16

74 x 105

2.91 x 4.13

2 15/16 x 4 1/8

52 x 74

2.05 x 2.91

2 1/16 x 2 15/16

37 x 52

1.46 x 2.05

1 7/16 x 2 1/16

A10

29 x 37

1.14 x 1.46

1 1/8 x 1 7/16

B series

The B series was designed to fill the voids between the A series sizes. These are used for special applications like posters, wall charts and labels.

B series paper sizes

Size

Millimetres

Decimal Inches

Nearest 1/16"

1000 x 1414

39.37 x 55.67

39 3/8 x 55 11/16

707 x 1000

27.83 x 39.37

27 13/16 x 39 3/8

500 x 707

19.69 x 27.83

19 11/16 x 27 13/16

353 x 500

13.90 x 19.69

13 7/8 x 19 11/16

250 x 353

9.84 x 13.90

9 13/16 x 13 7/8

176 x 250

6.93 x 9.84

6 15/16 x 9 13/16

125 x 176

4.92 x 6.93

4 15/16 x 6 15/16

88 x 125

3.46 x 4.92

3 7/16 x 4 15/16

62 x 88

2.44 x 3.46

2 7/16 x 3 7/16

44 x 62

1.73 x 2.44

1 3/4 x 2 7/16

B10

31 x 44

1.22 x 1.73

1 1/4 x 1 3/4

C series

The C series is the standard series for envelopes and folders. Each C size envelope is designed to fit the corresponding A size flat sheet. For example, the C4 envelope is designed for the A4 letter. A special DL size envelope was designed to accommodate the traditional tri-folded letter.

C series paper sizes

Size

Millimetres

Decimal Inches

Nearest 1/16"

648 x 917

25.51 x 36.10

25 1/2 x 36 1/8

458 x 648

18.03 x 25.51

18 x 25 1/2

324 x 458