A Paper Sizes – A0, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10

International paper sizes

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International Paper Sizes

A Paper Sizes – A0, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10. In most of the world an international system of paper sizes is used. The normal size of paper is called A4. It is measured in metric units. It is 210 millimetres wide and 297 millimetres long. This is about the size of US letter, but it is a little narrower, and a little longer. The Deutsches Institut für Normung chose this standard in 1922 and other countries soon followed.

The other common size of paper in Europe is called B5. It is 176 millimetres wide by 250 millimetres long. This is about the same as executive size in the United States. It is sometimes used for writing personal letters to people.

There are also many other paper sizes used for writing notes, for big posters, for books, and for other things.

In the international paper size system, the sizes are based on mathematical formulas. A0 is the biggest at 1 square metre. A1 is half as big as A0. A2 is half as big as A1, and so on. The sizes with “B” and “C” in their name are in between the “A” sizes.

Dimensions Of A Paper Sizes

A0

841 x 1189 mm

33.1 x 46.8 in

A1

594 x 841 mm

23.4 x 33.1 in

A2

420 x 594 mm

16.5 x 23.4 in

A3

297 x 420 mm

11.7 x 16.5 in

A4

210 x 297 mm

8.3 x 11.7 in

A5

148 x 210 mm

5.8 x 8.3 in

A6

105 x 148 mm

4.1 x 5.8 in

A7

74 x 105 mm

2.9 x 4.1 in

A9

52 x 74 mm

2.0 x 2.9 in

A10

26 x 37 mm

1.0 x 1.5 in

A Paper Sizes – A0, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10
A Paper Sizes - Source Wikipedia

A Series Format

Paper in the A series format (A Paper Sizes) has an aspect ratio of √2 (≈ 1.414, when rounded). A0 is defined so that it has an area of 1 m2 before rounding to the nearest millimetre. Successive paper sizes in the series (A1, A2, A3, etc.) are defined by halving the area of the preceding paper size and rounding down, so that the long side of A(n + 1) is the same length as the short side of An. Hence, each next size is nearly exactly half of the prior size. So, an A1 page can fit 2 A2 pages inside the same area.

The most used of this series is the size A4, which is 210 mm × 297 mm (8.27 in × 11.7 in) and thus almost exactly 0.0625 square metres (96.9 sq in) in area. For comparison, the letter paper size commonly used in North America (8 1⁄2 in × 11 in, 216 mm × 279 mm) is about 6 mm (0.24 in) wider and 18 mm (0.71 in) shorter than A4. Then, the size of A5 paper is half of A4, as 148 mm × 210 mm (5.8 in × 8.3 in).

The geometric rationale for using the square root of 2 is to maintain the aspect ratio of each subsequent rectangle after cutting or folding an A-series sheet in half, perpendicular to the larger side. Given a rectangle with a longer side, x, and a shorter side, y, ensuring that its aspect ratio, x/y , will be the same as that of a rectangle half its size, y/x/2, which means that x/y = y/x/2, which reduces to x/y = √2; in other words, an aspect ratio of 1:√2.

Paper Sizes in United States and Canada

In the United States and Canada the normal size of paper is called letter size, or sometimes US letter. It is 8 1⁄2 inches wide and 11 inches long (216 × 279 mm).

The other common size of paper in the US is called legal, or sometimes US legal. It is also 8 1⁄2 inches wide, but it is 14 inches long. It is similar to the size called foolscap in Britain.

Another size is called executive. It is 7 1⁄4 inches wide by 10 1⁄2 inches long. It is not very common. It is sometimes used for writing personal letters to people.

There is also a size called tabloid. It is 11 inches wide, and 17 inches long. That is the same size as two pieces of letter size put next to each other.

There are also many other paper sizes used for writing notes, for big posters, for books, and for other things.

Source Wikipedia
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