Dimensions of A paper sizes | A0,A1,A2,A3,A4,A5,A6,A7,A8,A9,A10

Aサイズ用紙 一覧

A Series Paper Sizes From 4A0 to A10

Size Width x Height (in) Width x Height (mm)
4A0 66.2 x 93.6 in 1682 x 2378 mm
2A0 46.8 x 66.2 in 1189 x 1682 mm
A0 33.1 x 46.8 in 841 x 1189 mm
A1 23.4 x 33.1 in 594 x 841 mm
A2 16.5 x 23.4 in 420 x 594 mm
A3 11.7 x 16.5 in 297 x 420 mm
A4 8.3 x 11.7 in 210 x 297 mm
A5 5.8 x 8.3 in 148 x 210 mm
A6 4.1 x 5.8 in 105 x 148 mm
A7 2.9 x 4.1 in 74 x 105 mm
A8 2.0 x 2.9 in 52 x 74 mm
A9 1.5 x 2.0 in 37 x 52 mm
A10 1.0 x 1.5 in 26 x 37 mm

Successive paper sizes in the series A1, A2, A3, and so forth, are defined by halving the preceding paper size across the larger dimension. This also effectively halves the area of each sheet. The most frequently used paper size is A4 measuring 210 by 297 millimetres (8.27 in × 11.7 in).

The dimensions of the A series paper sizes are defined by the ISO 216 international paper size standard. The A series was adopted in Europe in the 19th century, and is currently used all around the world, apart from in the USA and Canada. The most common paper size used in English speaking countries around the world is A4, which is 210mm x 297mm (8.27 inches x 11.7 inches). The largest sheet from the A series is the A0 size of paper. It has an area of 1m2, and the dimensions are 841mm x 1189mm. The A series uses an aspect ratio of 1:√2, and other sizes in the series are defined by folding the paper in half, parallel to its smaller sides. For example, cutting an A4 in half, will create an two A5 sheets, and so forth. Any size of brochure can be made using paper from the next larger size, for example A3 sheets are folded to make A4 brochures. The standard lengths and widths of the A series are rounded to the nearest millimetre.

ISO paper sizes in portrait view (with rounded inch values)

Format A series B series C series
Size mm × mm
in × in
mm × mm
in × in
mm × mm
in × in
0 841 × 1189 mm
33.1 × 46.8 in
1000 × 1414 mm
39.4 × 55.7 in
917 × 1297 mm
36.1 × 51.1 in
1 594 × 841 mm
23.4 × 33.1 in
707 × 1000 mm
27.8 × 39.4 in
648 × 917 mm
25.5 × 36.1 in
2 420 × 594 mm
16.5 × 23.4 in
500 × 707 mm
19.7 × 27.8 in
458 × 648 mm
18.0 × 25.5 in
3 297 × 420 mm
11.7 × 16.5 in
353 × 500 mm
13.9 × 19.7 in
324 × 458 mm
12.8 × 18.0 in
4 210 × 297 mm
8.27 × 11.7 in
250 × 353 mm
9.84 × 13.9 in
229 × 324 mm
9.02 × 12.8 in
5 148 × 210 mm
5.83 × 8.27 in
176 × 250 mm
6.93 × 9.84 in
162 × 229 mm
6.38 × 9.02 in
6 105 × 148 mm
4.13 × 5.83 in
125 × 176 mm
4.92 × 6.93 in
114 × 162 mm
4.49 × 6.38 in
7 74 × 105 mm
2.91 × 4.13 in
88 × 125 mm
3.46 × 4.92 in
81 × 114 mm
3.19 × 4.49 in
8 52 × 74 mm
2.05 × 2.91 in
62 × 88 mm
2.44 × 3.46 in
57 × 81 mm
2.24 × 3.19 in
9 37 × 52 mm
1.46 × 2.05 in
44 × 62 mm
1.73 × 2.44 in
40 × 57 mm
1.57 × 2.24 in
10 26 × 37 mm
1.02 × 1.46 in
31 × 44 mm
1.22 × 1.73 in
28 × 40 mm
1.10 × 1.57 in

The α variables are the distinct first terms in the three geometric progressions of the same common-ratio equal to the square root of two. Each of the three geometric progressions (corresponding to the three series A, B, C) is formed by all possible paper dimensions (length and width) of the series arranged in a decreasing order. This interesting arrangement of dimensions is also very useful – not only it forms a geometric progression with easy to remember formulae, it also has that each consecutive pair of values (like a sliding window of size 2) will automatically correspond to the dimensions of a standard paper format in the series.

A series B series C series US sizes US Envelope
International Envelope Photography Paper Canadian Japanese Books
Newspaper Chinese Billboard Imperial Colombian
French Raw Transitional

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