International ISO Paper sizes and Dimensions of A Series Paper sizes

The international paper size standard, ISO216, is used throughout the world. The article below gives an explanation as to how these sizes are calculated and a size chart for looking up various A series paper measurements.

ISO Paper Sizes Standard Overview & Rationale

The ISO paper size A standard is based on each size being half of the size of the previous one, when folded parallel to the shorter lengths. This system allows for a variety of useful applications, such as the enlarging and reducing of images without any cut off or margins, or folding to make a booklet of the next size down.

The mathematics behind this useful feature is that the sheets have an aspect ratio (that's the ratio of the length to the width) of the square root of 2.

A Series Paper Sizes Formal Definition

The ISO 216 definiton of the A paper sizes is based on the following basis:

• The length divided by the width is 1.4142

• The A0 size has an area of 1 square metre.

• Each subsequent size A(n) is defined as A(n-1) cut in half parallel to its shorter sides.

• The standard length and width of each size is rounded to the nearest millimetre.

Note: The last item is there because the root 2 aspect ratio doesn't always give a whole number.

Dimensions Of A Series Paper Sizes

The dimensions of the A series paper sizes, as defined by ISO 216, are given in the table below in both millimetres and inches (cm measurements can be obtained by dividing mm value by 10). The A Series paper size chart gives a visual explanation of how the sizes relate to each other - for example A5 is half of A4 size paper and A2 is half of A1 size paper.

Table of Paper Sizes From 4A0 to A10

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

What are A1 paper size dimensions

 A1 Paper size as defined by the international ISO 216 standard is 841 x 594 mm or 33.1 x 23.4 in.

What are A2 paper size dimensions

 A2 Paper size as defined by the international ISO 216 standard is 594 x 420 mm or 23.4 x 16.5 in.

What are A3 paper size dimensions

 A3 Paper size as defined by the international ISO 216 standard is 420 x 297 mm or 16.5 x 11.7 in.

What are A4 paper size dimensions

 A4 Paper size as defined by the international ISO 216 standard is 297 x 210 mm or 11.7 x 8.3 in.

What are A5 paper size dimensions

 A5 Paper size as defined by the international ISO 216 standard is 210 x 148 mm or 8.3 x 5.8 in.

What are A6 paper size dimensions

 A6 Paper size as defined by the international ISO 216 standard is 148 x 105 mm or 5.8 x 4.1 in.

 

What are A7 paper size dimensions

A7 Paper size as defined by the international ISO 216 standard is 105 x 74 mm or 4.1 x. 2.9 in.

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