# International standard paper sizes

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International standard for paper sizes, including A4

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Visualization with paper sizes in formats A0 to A8, exhibited at the science museum CosmoCaixa Barcelona

**ISO 216** is an [international standard](/source/International_Organization_for_Standardization) for [paper sizes](/source/Paper_size), used around the world except in North America, the Philippines and parts of Latin America. The standard defines the "**A**", "**B**" and "**C**" series of paper sizes, which includes the **A4**, the most commonly available paper size worldwide. Two supplementary standards, [ISO 217](/source/ISO_217) and [ISO 269](/source/ISO_269), define related paper sizes.

All ISO 216, ISO 217 and ISO 269 paper sizes (except some envelopes) have the same [aspect ratio](/source/Aspect_ratio), [√2:1](/source/Square_root_of_2#Paper_size), within rounding error. This ratio has the unique property that when cut or folded in half widthways, the halves also have the same aspect ratio. Each ISO paper size is one half of the area of the next larger size in the same series.[1]

## Dimensions of A, B and C series

ISO paper sizes in millimetres and in inches Size A series formats B series formats C series formats name mm inches name mm inches name mm inches −2 4A0 1682 × 2378 66.2 × 93.6 −1 2A0 1189 × 1682 46.8 × 66.2 2B0 1414 × 2000 55.7 × 78.7 2C0 1297 × 1834 51.1 × 72.2 0 A0 0841 × 1189 33.1 × 46.8 B0 1000 × 1414 39.4 × 55.7 C0 0917 × 1297 36.1 × 51.1 1 A1 0594 × 0841 23.4 × 33.1 B1 0707 × 1000 27.8 × 39.4 C1 0648 × 0917 25.5 × 36.1 2 A2 0420 × 0594 16.5 × 23.4 B2 0500 × 0707 19.7 × 27.8 C2 0458 × 0648 18.0 × 25.5 3 A3 0297 × 0420 11.7 × 16.5 B3 0353 × 0500 13.9 × 19.7 C3 0324 × 0458 12.8 × 18.0 4 A4 0210 × 0297 08.3 × 11.7 B4 0250 × 0353 09.8 × 13.9 C4 0229 × 0324 09.0 × 12.8 5 A5 0148 × 0210 05.8 × 08.3 B5 0176 × 0250 06.9 × 09.8 C5 0162 × 0229 06.4 × 09.0 6 A6 0105 × 0148 04.1 × 05.8 B6 0125 × 0176 04.9 × 06.9 C6 0114 × 0162 04.5 × 06.4 7 A7 0074 × 0105 02.9 × 04.1 B7 0088 × 0125 03.5 × 04.9 C7 0081 × 0114 03.2 × 04.5 8 A8 0052 × 0074 02.0 × 02.9 B8 0062 × 0088 02.4 × 03.5 C8 0057 × 0081 02.2 × 03.2 9 A9 0037 × 0052 01.5 × 02.0 B9 0044 × 0062 01.7 × 02.4 C9 0040 × 0057 01.6 × 02.2 10 A10 0026 × 0037 01.0 × 01.5 B10 0031 × 0044 01.2 × 01.7 C10 0028 × 0040 01.1 × 01.6

Comparison of ISO 216 paper sizes between A4 and A3 and Swedish extension [SIS 014711](/source/SIS_014711) sizes

## History

"Lichtenberg ratio" redirects here. For

            2

    {\textstyle {\sqrt {2}}}

, see [Square root of 2](/source/Square_root_of_2).

The oldest known mention of the advantages of basing a paper size on an [aspect ratio](/source/Aspect_ratio) of 2 {\textstyle {\sqrt {2}}} is found in a letter written on 25 October 1786 by the German scientist [Georg Christoph Lichtenberg](/source/Georg_Christoph_Lichtenberg) to [Johann Beckmann](/source/Johann_Beckmann), both at the [University of Göttingen](/source/University_of_G%C3%B6ttingen).[2] Early variants of the formats that would become ISO paper sizes A2, A3, B3, B4, and B5 then evolved in France, where they were listed in a 1798 French law on taxation of publications ([French](/source/French_language): *Loi sur le timbre (Nº 2136)*) that was based in part on page sizes.[3]

Comparison of A4 (shaded grey) and C4 sizes with some similar paper and photographic paper sizes

Searching for a standard system of paper formats on a scientific basis at [the Bridge](/source/Die_Br%C3%BCcke_(institute)) association ([German](/source/German_language): *Die Brücke*), as a replacement for the vast variety of other paper formats that had been used before, in order to make paper stocking and document reproduction cheaper and more efficient, in 1911 [Wilhelm Ostwald](/source/Wilhelm_Ostwald) proposed, over a hundred years after the 1798 French law,[3] a global standard – a [world format](/source/Die_Br%C3%BCcke_(institute)#Weltformat_-_World_Standard) (*Weltformat*) – for paper sizes based on the ratio 2 {\textstyle {\sqrt {2}}} , referring to the argument advanced by Lichtenberg's 1786 letter, but linking this to the [metric system](/source/Metric_system) using 1 [centimetre](/source/Centimetre) (0.39 in) as the width of the base format. [Walter Porstmann](https://en.wikipedia.org/w/index.php?title=Walter_Porstmann&action=edit&redlink=1) [[de](https://de.wikipedia.org/wiki/Walter_Porstmann)] argued in a long article published in 1918, that a firm basis for the system of paper formats, which deal with surfaces, ought not be the length but the area; that is, linking the system of paper formats to the metric system using the square metre rather than the centimetre, constrained by x y = 2 {\textstyle {\tfrac {x}{y}}={\sqrt {2}}} and area a = x × y = 1 {\textstyle a=x\times y=1} square metre, where x {\textstyle x} is the length of the longer side and y {\textstyle y} is the length of the shorter side, for the second equation both in metres. Porstmann also argued that formats for *containers* of paper, such as envelopes, should be 10% larger than the paper format itself.

In 1921, after a long discussion and another intervention by Porstmann, the Standardisation Committee of German Industry (*Normenausschuß der deutschen Industrie*, or NADI in short), which is the [German Institute for Standardisation](/source/Deutsches_Institut_f%C3%BCr_Normung) (*Deutsches Institut für Normung*, or DIN in short) today, published German standard *DI Norm 476* the specification of four series of paper formats with ratio 2 {\textstyle {\sqrt {2}}} , with series A as the always preferred formats and basis for the other series. All measures are in millimetres. The measurements of A0 are rounded to the nearest millimetre, and other sizes are derived by dividing or multiplying from A0 and then rounding down to a whole number of millimetres. A0 has a surface area of 1 square metre (11 sq ft) up to a [rounding error](/source/Rounding_error), with a width of 841 millimetres (33.1 in) and height of 1,189 millimetres (46.8 in), so an actual area of 0.999949 square metres (10.76336 sq ft); A4 is recommended as standard paper size for business, administrative and government correspondence; and A6 for postcards. Series B is based on B0 with width of 1 metre (3 ft 3 in), C0 is 917 by 1,297 millimetres (36.1 in × 51.1 in), and D0 771 by 1,090 millimetres (30.4 in × 42.9 in). Series C is the basis for envelope formats.

The DIN paper-format concept was soon introduced as a national standard in many other countries, for example, Belgium (1924), Netherlands (1925), Norway (1926), Switzerland (1929), Sweden (1930), Soviet Union (1934), Hungary (1938), Italy (1939), Finland (1942), Uruguay (1942), Argentina (1943), Brazil (1943), Spain (1947), Austria (1948), Romania (1949), Japan (1951), Denmark (1953), Czechoslovakia (1953), Israel (1954), Portugal (1954), Yugoslavia (1956), India (1957), Poland (1957), United Kingdom (1959), Venezuela (1962), New Zealand (1963), Iceland (1964), Mexico (1965), South Africa (1966), France (1967), Peru (1967), Turkey (1967), Chile (1968), Greece (1970), Zimbabwe (1970), Singapore (1970), Bangladesh (1972), Thailand (1973), Barbados (1973), Australia (1974), Ecuador (1974), Colombia (1975) and Kuwait (1975).

It finally became both an international standard ([ISO](/source/ISO) 216) as well as the official [United Nations](/source/United_Nations) document format in 1975, and it is today used in almost all countries in the world, with the exception of several countries in the Americas.

In 1977, a large German car manufacturer performed a study of the paper formats found in their incoming mail and concluded that out of 148 examined countries, 88 already used the A series formats.[4]

## Advantages

An A4 paper sheet folded into two A5 size pages

The main advantage of this system is its scaling. [Rectangular](/source/Rectangle) paper with an aspect ratio of 2 {\textstyle {\sqrt {2}}} has the unique property that, when cut in two across the midpoints of the longer sides, each half has the same 2 {\textstyle {\sqrt {2}}} aspect ratio as the whole sheet before it was divided. Equivalently, if one lays two same-sized sheets of paper with an aspect ratio of 2 {\textstyle {\sqrt {2}}} side by side along their longer side, they form a larger rectangle with the aspect ratio of 2 {\textstyle {\sqrt {2}}} and double the area of each individual sheet.

The ISO system of paper sizes exploits these properties of the 2 {\textstyle {\sqrt {2}}} aspect ratio. In each series of sizes (for example, series A), the largest size is numbered 0 (so in this case A0), and each successive size (A1, A2, etc.) has half the area of the preceding sheet and can be cut by halving the length of the preceding size sheet. The new measurement is rounded down to the nearest millimetre. A folded [brochure](/source/Brochure) can be made by using a sheet of the next larger size (for example, an A4 sheet is folded in half to make a brochure with size A5 pages). An office [photocopier](/source/Photocopier) or printer can be designed to reduce a page from A4 to A5 or to enlarge a page from A4 to A3. Similarly, two sheets of A4 can be scaled down to fit one A4 sheet without excess empty paper.

This system also simplifies calculating the weight of paper. Under [ISO 536](https://en.wikipedia.org/w/index.php?title=ISO_536&action=edit&redlink=1), paper's [grammage](/source/Grammage) is defined as a sheet's mass in [grams](/source/Gram) (g) per area in [square metres](/source/Square_metre) (unit symbol g/m2; the nonstandard abbreviation "gsm" is also used).[5] One can derive the weight of other sizes by [arithmetic division](/source/Division_(mathematics)). A standard A4 sheet made from 80 g/m2 paper weighs 5 grams (0.18 oz), as it is 1⁄16 (four halvings, ignoring rounding) of an A0 page. Thus the weight, and the associated [postage rate](/source/Mail#postage), can be approximated easily by counting the number of sheets used.

ISO 216 and its related standards were first published between 1975 and 1995:

- ISO 216:2007, defining the A and B series of paper sizes

- ISO 269:1985, defining the C series for envelopes

- ISO 217:2013, defining the RA and SRA series of raw ("untrimmed") paper sizes

## Properties

### A series

Paper in the A series format has an [aspect ratio](/source/Aspect_ratio) of √2 (≈ 1.414, when rounded). A0 is defined so that it has an area of 1 m2 (about 11 ft2) before rounding to the nearest 1 millimetre (0.039 in). Successive paper sizes in the series (A1, A2, A3, etc.) are defined by halving the area of the (unrounded) preceding paper size and rounding down, so that the long side of A(*n* + 1) is the same length as the short side of A*n*. Hence, each next size is nearly exactly half the area of the prior size. So two A2 pages (in [landscape orientation](/source/Landscape_orientation)) fit together over an A1 page (in [portrait orientation](/source/Portrait_orientation)), an A3 page is half an A2 page, A4 is half an A3 and so on.

The most used of this series is the **A4 paper** size, which is 210 mm × 297 mm (8.27 in × 11.7 in) and thus almost exactly 1⁄16 square metre (0.0625 m2; 96.8752 sq in) in area. For comparison, the [letter](/source/Letter_(paper_size)) 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, i.e. 148 mm × 210 mm (5.8 in × 8.3 in).[6][7]

The geometric rationale for using the [square root of 2](/source/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.

Any A*n* paper can be defined as A*n* = *S* × *L*, where (measuring in metres)

A n = { S = ( 1 2 ) n + 1 / 2 L = ( 1 2 ) n − 1 / 2 {\displaystyle {\text{A}}_{n}={\begin{cases}S=\left({\sqrt {\frac {1}{2}}}\,\right)^{n+1/2}\\L=\left({\sqrt {\frac {1}{2}}}\,\right)^{n-1/2}\end{cases}}}

Therefore

A 0 = { S = ( 1 2 ) 0 + 1 / 2 ≈ 0.841 m L = ( 1 2 ) 0 − 1 / 2 ≈ 1.189 m {\displaystyle {\text{A}}_{0}={\begin{cases}S=\left({\sqrt {\frac {1}{2}}}\,\right)^{0+1/2}\approx 0.841\,{\text{m}}\\L=\left({\sqrt {\frac {1}{2}}}\,\right)^{0-1/2}\approx 1.189\,{\text{m}}\end{cases}}} A 1 = { S = ( 1 2 ) 1 + 1 / 2 ≈ 0.595 m L = ( 1 2 ) 1 − 1 / 2 ≈ 0.841 m {\displaystyle {\text{A}}_{1}={\begin{cases}S=\left({\sqrt {\frac {1}{2}}}\,\right)^{1+1/2}\approx 0.595\,{\text{m}}\\L=\left({\sqrt {\frac {1}{2}}}\,\right)^{1-1/2}\approx 0.841\,{\text{m}}\end{cases}}} A 2 = { S = ( 1 2 ) 2 + 1 / 2 ≈ 0.420 m L = ( 1 2 ) 2 − 1 / 2 ≈ 0.595 m {\displaystyle {\text{A}}_{2}={\begin{cases}S=\left({\sqrt {\frac {1}{2}}}\,\right)^{2+1/2}\approx 0.420\,{\text{m}}\\L=\left({\sqrt {\frac {1}{2}}}\,\right)^{2-1/2}\approx 0.595\,{\text{m}}\end{cases}}}

etc.

### B series

The B series is defined in the standard as follows: "A subsidiary series of sizes is obtained by placing the [geometrical means](/source/Geometric_mean) between adjacent sizes of the A series in sequence." The use of the geometric mean makes each step in size: B0, A0, B1, A1, B2 ... smaller than the previous one by the same factor. As with the A series, the lengths of the B series have the ratio √2, and folding one in half (and rounding down to the nearest millimetre) gives the next in the series. The shorter side of B0 is exactly 1 metre.

There is also an incompatible Japanese B series which the [JIS](/source/Japanese_Industrial_Standard) defines to have 1.5 times the area of the corresponding JIS A series (which is identical to the ISO A series).[8] Thus, the lengths of JIS B series paper are √1.5 ≈ 1.22 times those of A-series paper. By comparison, the lengths of ISO B series paper are 4√2 ≈ 1.19 times those of A-series paper (and √2 ≈ 1.41 times the area).

Any B*n* paper (according to the ISO standard) can be defined as B*n* = *S* × *L*, where (measuring in metres)

B n = { S = ( 1 2 ) n L = ( 1 2 ) n − 1 {\displaystyle {\text{B}}_{n}={\begin{cases}S=\left({\sqrt {\frac {1}{2}}}\,\right)^{n}\\L=\left({\sqrt {\frac {1}{2}}}\,\right)^{n-1}\end{cases}}}

Therefore

B 0 = { S = ( 1 2 ) 0 = 1 m L = ( 1 2 ) 0 − 1 ≈ 1.414 m {\displaystyle {\text{B}}_{0}={\begin{cases}S=\left({\sqrt {\frac {1}{2}}}\,\right)^{0}=1\,{\text{m}}\\L=\left({\sqrt {\frac {1}{2}}}\,\right)^{0-1}\approx 1.414\,{\text{m}}\end{cases}}} B 1 = { S = ( 1 2 ) 1 ≈ 0.707 m L = ( 1 2 ) 1 − 1 = 1 m {\displaystyle {\text{B}}_{1}={\begin{cases}S=\left({\sqrt {\frac {1}{2}}}\,\right)^{1}\approx 0.707\,{\text{m}}\\L=\left({\sqrt {\frac {1}{2}}}\right)^{1-1}=1\,{\text{m}}\end{cases}}} B 2 = { S = ( 1 2 ) 2 = 0.5 m L = ( 1 2 ) 2 − 1 ≈ 0.707 m {\displaystyle {\text{B}}_{2}={\begin{cases}S=\left({\sqrt {\frac {1}{2}}}\,\right)^{2}=0.5\,{\text{m}}\\L=\left({\sqrt {\frac {1}{2}}}\,\right)^{2-1}\approx 0.707\,{\text{m}}\end{cases}}}

etc.

### C series

The C series formats are geometric means between the B series and A series formats with the same number (e.g. C2 is the geometric mean between B2 and A2). The width to height ratio of C series formats is √2 as in the A and B series. A, B, and C series of paper fit together as part of a [geometric progression](/source/Geometric_progression), with ratio of successive side lengths of 8√2, though there is no size half-way between B*n* and A(*n* − 1): A4, C4, B4, "D4", A3, ...; there is such a D-series in the [Swedish extensions](/source/Paper_size#Swedish_extensions) to the system. The lengths of ISO C series paper are therefore 8√2 ≈ 1.09 times those of A-series paper.

The C series formats are used mainly for [envelopes](/source/Envelope). An unfolded A4 page will fit into a C4 envelope. Due to same width to height ratio, if an A4 page is folded in half so that it is A5 in size, it will fit into a C5 envelope (which will be the same size as a C4 envelope folded in half).

Any C*n* paper can be defined as C*n* = *S* × *L*, where (measuring in metres)

C n = { S = ( 1 2 ) n + 1 / 4 L = ( 1 2 ) n − 3 / 4 {\displaystyle {\text{C}}_{n}={\begin{cases}S=\left({\sqrt {\frac {1}{2}}}\,\right)^{n+1/4}\\L=\left({\sqrt {\frac {1}{2}}}\,\right)^{n-3/4}\end{cases}}}

Therefore

C 0 = { S = ( 1 2 ) 0 + 1 / 4 ≈ 0.917 m L = ( 1 2 ) 0 − 3 / 4 ≈ 1.297 m {\displaystyle {\text{C}}_{0}={\begin{cases}S=\left({\sqrt {\frac {1}{2}}}\,\right)^{0+1/4}\approx 0.917\,{\text{m}}\\L=\left({\sqrt {\frac {1}{2}}}\,\right)^{0-3/4}\approx 1.297\,{\text{m}}\end{cases}}} C 1 = { S = ( 1 2 ) 1 + 1 / 4 ≈ 0.648 m L = ( 1 2 ) 1 − 3 / 4 ≈ 0.917 m {\displaystyle {\text{C}}_{1}={\begin{cases}S=\left({\sqrt {\frac {1}{2}}}\,\right)^{1+1/4}\approx 0.648\,{\text{m}}\\L=\left({\sqrt {\frac {1}{2}}}\,\right)^{1-3/4}\approx 0.917\,{\text{m}}\end{cases}}} C 2 = { S = ( 1 2 ) 2 + 1 / 4 ≈ 0.458 m L = ( 1 2 ) 2 − 3 / 4 ≈ 0.648 m {\displaystyle {\text{C}}_{2}={\begin{cases}S=\left({\sqrt {\frac {1}{2}}}\,\right)^{2+1/4}\approx 0.458\,{\text{m}}\\L=\left({\sqrt {\frac {1}{2}}}\,\right)^{2-3/4}\approx 0.648\,{\text{m}}\end{cases}}}

etc.

## Tolerances

The tolerances specified in the standard are:

- ±1.5 mm for dimensions up to 150 mm,

- ±2.0 mm for dimensions in the range 150 to 600 mm, and

- ±3.0 mm for dimensions above 600 mm.

These are related to comparison between series A, B and C.

## Application

The ISO 216 formats are organized around the ratio 1:√2; two sheets next to each other together have the same ratio, sideways.

In scaled photocopying, for example, two A4 sheets reduced to A5 size fit exactly onto one A4 sheet, and an A4 sheet in magnified size onto an A3 sheet; in each case, there is neither waste nor want.

The principal countries not generally using the ISO paper sizes are the United States and Canada, which use [North American paper sizes](/source/Paper_size#North_American_paper_sizes). Although many Latin American countries have also officially adopted the ISO 216 paper format, Mexico, Panama, Peru, Colombia, the Philippines, and Chile also use mostly U.S. paper sizes.

[Rectangular](/source/Rectangle) sheets of paper with the ratio 1:√2 are popular in [paper folding](/source/Paper_folding), such as [origami](/source/Mathematics_of_paper_folding), where they are sometimes called "A4 rectangles" or "silver rectangles".[9] In other contexts, the term "silver rectangle" can also refer to a rectangle in the proportion 1:(1 + √2), known as the [silver ratio](/source/Silver_ratio).

## Matching technical pen widths

Rotring Rapidographs in ISO nib sizes

An adjunct to the ISO paper sizes, particularly the A series, are the technical drawing line widths specified in [ISO 128](/source/ISO_128). For example, line type A ("Continuous – thick", used for "visible outlines") has a standard thickness of 0.7 mm on an A0-sized sheet, 0.5 mm on an A1 sheet, and 0.35 mm on A2, A3, or A4.[10]

The matching [technical pen](/source/Technical_pen) widths are 0.13, 0.18, 0.25, 0.35, 0.5, 0.7, 1.0, 1.40, and 2.0 mm, as specified in [ISO 9175-1](https://en.wikipedia.org/w/index.php?title=ISO_9175-1&action=edit&redlink=1). Colour codes are assigned to each size to facilitate easy recognition by the drafter. Like the paper sizes, these pen widths increase by a factor of √2, so that particular pens can be used on particular sizes of paper, and then the next smaller or larger size can be used to continue the drawing after it has been reduced or enlarged, respectively.[4][11]

- Line Width (mm) 0.10 0.13 0.18 0.25 0.35 0.50 0.70 1.0 1.4 2.0 Colour Maroon Violet Red White Yellow Brown Blue Orange Turquoise Gray

Micronorm logo

The earlier [DIN 6775](https://en.wikipedia.org/w/index.php?title=DIN_6775&action=edit&redlink=1) standard upon which ISO 9175-1 is based also specified a term and symbol for easy identification of pens and drawing templates compatible with the standard, called *Micronorm*, which may still be found on some technical drafting equipment.

## Overformats

DIN 476 provides for formats larger than A0, denoted by a prefix factor. In particular, it lists the formats 2A0 and 4A0, which are twice and four times the size of A0 respectively:

DIN 476 overformats (with rounded inch values) Name mm × mm inch × inch 4A0 1682 × 2378 66+5⁄24 × 93+5⁄8 2A0 1189 × 1682 46+19⁄24 × 66+5⁄24

While not formally defined, ISO 216:2007 notes them in the table of *Main series of trimmed sizes* (ISO A series) as well: "The rarely used sizes [2A0 and 4A0] which follow also belong to this series." 2A0 is also known by other unofficial names like "A00".[12]

## See also

- [ANSI/ASME Y14.1](/source/ANSI%2FASME_Y14.1)

- [International standard envelope sizes](/source/Envelope_sizes#International_standard_sizes)

- [Paper density](/source/Paper_density)

## References

1. **[^](#cite_ref-1)** ["International Paper Sizes & Formats"](https://www.papersizes.org). *Paper Sizes*. Retrieved 29 June 2020.

1. **[^](#cite_ref-Beck_2-0)** Lichtenberg, Georg Christoph (7 February 2006) [Written 25 October 1786]. ["Lichtenberg's letter to Johann Beckmann"](https://www.cl.cam.ac.uk/~mgk25/lichtenberg-letter.html) (in German and English). Translated by [Kuhn, Markus](/source/Markus_Kuhn_(computer_scientist)). [University of Cambridge](/source/University_of_Cambridge). Retrieved 10 May 2016. Published in Lichtenberg, Georg Christoph (1990). Joost, Ulrich; [Schöne, Albrecht](/source/Albrecht_Sch%C3%B6ne) (eds.). [*Briefwechsel*](https://books.google.com/books?id=iz8cwXux3B0C&pg=PA274) [*Correspondence*] (in German). Vol. III (1785–1792). Munich: Beck. pp. 274–75. [ISBN](/source/ISBN_(identifier)) [3-406-30958-5](https://en.wikipedia.org/wiki/Special:BookSources/3-406-30958-5). Retrieved 10 May 2016.

1. ^ [***a***](#cite_ref-B237_3-0) [***b***](#cite_ref-B237_3-1) ["Loi sur le timbre (Nº 2136)"](http://www.cl.cam.ac.uk/~mgk25/loi-timbre.html) [Stamp Act (No. 2136)]. *Bulletin des Lois de la République* (in French) (237). Paris: Republic of France: 1–2. 3 November 1798. [Archived](https://web.archive.org/web/20090426170239/http://www.cl.cam.ac.uk/~mgk25/loi-timbre.html) from the original on 26 April 2009. Retrieved 20 January 2024 – via Markus Kuhn.

1. ^ [***a***](#cite_ref-:0_4-0) [***b***](#cite_ref-:0_4-1) Kuhn, Markus. ["International standard paper sizes"](https://www.cl.cam.ac.uk/~mgk25/iso-paper.html). Retrieved 30 August 2017.

1. **[^](#cite_ref-ISO_536_5-0)** [International Organization for Standardization](/source/International_Organization_for_Standardization) (November 2019). ["ISO 536:2019(en): Paper and board — Determination of grammage"](https://www.iso.org/obp/ui/#iso:std:iso:536:ed-4:v1:en). *ISO Browsing Platform* (4 ed.). § 3.1 note 1. Retrieved 8 June 2021.

1. **[^](#cite_ref-6)** ["A Paper Sizes – A0, A1, A2, A3, A4, A5, A6, A7, A8, A9"](https://www.papersizes.org/a-paper-sizes.htm). *papersizes.org*. Retrieved 2 August 2018.

1. **[^](#cite_ref-7)** ["International Paper Sizes, Dimensions, Format & Standards"](https://papersize.co/). *PaperSize*. Retrieved 5 October 2018.

1. **[^](#cite_ref-8)** ["Japanese B Series Paper Size"](http://www.paper-sizes.com/uncommon-paper-sizes/japanese-b-series-paper-size). Retrieved 18 April 2010.

1. **[^](#cite_ref-Lister_9-0)** Lister, David. ["The A4 rectangle"](http://www.britishorigami.info/academic/lister/a4.php). *The Lister List*. England: British Origami Society. Retrieved 6 May 2009.

1. **[^](#cite_ref-10)** Bell, Steven. ["Pen Sizes and Line Types"](http://www.metrication.com/drafting/lines.html). *Metrication.com*. Retrieved 30 August 2017.

1. **[^](#cite_ref-11)** ["Technical drawing pen sizes"](https://www.designingbuildings.co.uk/wiki/Technical_drawing_pen_sizes). *Designing Buildings Wiki*. Retrieved 30 August 2017.

1. **[^](#cite_ref-12)** ["A00"](https://pixel2print.co.uk/print/posters-(new)/large-format-posters/a00/).

## External links

Wikimedia Commons has media related to [DIN EN ISO 216](https://commons.wikimedia.org/wiki/Category:DIN_EN_ISO_216).

- [International standard paper sizes](https://www.cl.cam.ac.uk/~mgk25/iso-paper.html): ISO 216 details and [rationale](/source/Design_rationale)

- [ISO 216 at iso.org](https://www.iso.org/standard/36631.html)

- [Articles by Wilhelm Ostwald referencing Lichtenberg's letter, and W. Porstmann specifying a metric system of norms for formats for lengths, surfaces (planes), and volumes, laying the ground for the DIN-Series, in German](https://www.cl.cam.ac.uk/~mgk25/volatile/DIN-A4-origins.pdf)

- [Explanation of paper sizes](https://www.cl.cam.ac.uk/~mgk25/iso-paper.html)

v t e International Organization for Standardization (ISO) standards List of ISO standards – ISO romanizations – IEC standards 1–9999 1 2 3 4 6 7 9 16 17 31 -0 -1 -3 -4 -5 -6 -7 -8 -9 -10 -11 -12 -13 68-1 128 216 217 226 228 233 259 261 262 302 306 361 500 518 519 639 -1 -2 -3 -5 -6 646 657 668 690 704 732 764 838 843 860 898 965 999 1000 1004 1007 1073-1 1073-2 1155 1413 1538 1629 1745 1989 2014 2015 2022 2033 2047 2108 2145 2146 2240 2281 2533 2709 2711 2720 2788 2848 2852 2921 3029 3103 3166 -1 -2 -3 3297 3307 3601 3602 3864 3901 3950 3977 4031 4157 4165 4217 4909 5218 5426 5427 5428 5725 5775 5776 5800 5807 5964 6166 6344 6346 6373 6385 6425 6429 6438 6523 6709 6943 7001 7002 7010 7027 7064 7098 7185 7200 7498 -1 7637 7736 7810 7811 7812 7813 7816 7942 8000 8093 8178 8217 8373 8501-1 8571 8583 8601 8613 8632 8651 8652 8691 8805/8806 8807 8820-5 8859 -1 -2 -3 -4 -5 -6 -7 -8 -8-I -9 -10 -11 -12 -13 -14 -15 -16 8879 9000/9001 9036 9075 9126 9141 9227 9241 9293 9314 9362 9407 9496 9506 9529 9564 9592/9593 9594 9660 9797-1 9897 9899 9945 9984 9985 9995 10000–19999 10006 10007 10116 10118-3 10160 10161 10165 10179 10206 10218 10279 10303 -11 -21 -22 -28 -238 10383 10585 10589 10628 10646 10664 10746 10861 10957 10962 10967 11073 11170 11172 11179 11404 11544 11783 11784 11785 11801 11889 11898 11940 (-2) 11941 11941 (TR) 11992 12006 12052 12182 12207 12234-2 12620 13211 -1 -2 13216 13250 13399 13406-2 13450 13485 13490 13567 13568 13584 13616 13816 13818 14000 14031 14224 14289 14396 14443 14496 -2 -3 -6 -10 -11 -12 -14 -17 -20 14617 14644 14649 14651 14698 14764 14882 14971 15022 15118 15189 15288 15291 15398 15408 15444 -3 -9 15445 15438 15504 15511 15686 15693 15706 -2 15707 15897 15919 15924 15926 15926 WIP 15930 15938 16023 16262 16355-1 16485 16612-2 16750 16949 (TS) 17024 17025 17100 17203 17369 17442 17506 17799 18004 18014 18181 18245 18629 18760 18916 19005 19011 19092 -1 -2 19114 19115 19125 19136 19407 19439 19500 19501 19502 19503 19505 19506 19507 19508 19509 19510 19600 19650 19752 19757 19770 19775-1 19794-5 19831 20000–29999 20000 20022 20121 20400 20802 20830 21000 21001 21047 21122 21500 21778 21827 22000 22275 22300 22301 22395 22537 23000 23003 23008 23009 23090-3 23092 23094-1 23094-2 23270 23271 23360 23941 24517 24613 24617 24707 24728 25178 25964 26000 26262 26300 26324 27000 series 27000 27001 27002 27005 27006 27729 28000 29110 29148 29199-2 29500 30000+ 30170 31000 32000 37001 38500 39075 40230 40240 40250 40260 40314 40500 42010 45001 50001 55000 56000 80000 Category

v t e Deutsches Institut für Normung DIN standards DIN 1025 DIN 1451 DIN 1530 DIN 5008 DIN 5009 DIN 31635 DIN 41612 DIN 43700 DIN 4420 DIN 47100 DIN 62056 DIN 72552 DIN 91379 Engschrift ISO 216 Committees Municipal Services Standards Committee Connectors DIN connector Mini-DIN connector Multimedia extension connector Rails DIN rail

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Adapted from the Wikipedia article [International standard paper sizes](https://en.wikipedia.org/wiki/International_standard_paper_sizes) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/International_standard_paper_sizes?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.