The B series paper standards are also based around the 1:root 2 aspect ratio, butin order to provide sizes not covered by the A series, the length and width of size B(n) are defined as being the geometric mean of size A(n) and size A(n-1).
The C series sizes were introduced to define the sizes of envelopes suitable for the A series paper sizes. This is also based on the root 2 aspect ratio and the size ofa C(n) envelope is defined as the geometric mean of paper sizes A(n) and B(n). This leads to a C(n) envelope which nicely holds a sheet of A(n) paper unfolded.
The B series paper sizes were created in order to provide paper sizes that weren't coveredby the A series, but also use an aspect ratio of 1:root2. B sizes are defined as size B(n) being thegeometric mean of size A(n) and size A(n-1). The of 2 numbers being the square rootof the product of the two numbers.
To ensure accurate, economical printing when publications designed or typeset in one country are printed in a second country, it is necessary to know the standard paper sizes used in the second country. Because designers and publishers often do not have ready access to this information, EDS Inc., Editorial & Design Services, has published this concise guide, consisting of the four tables listed below. For additional sizes and complete inch-metric equivalents, see and . For office and business papers, see . See for additional information of interest to transnational publishers.
Feedback and experience suggest that ISO (International Organization for Standardization) paper sizes--based on the earlier DIN (Deutsche Industrie Norm) sizes--are commonly used everywhere in the world except Canada and the United States. For an admirable explanation and summary of ISO paper-size standards, see Markus Kuhn's Web page.
The ISO 216 paper sizes have some useful properties for reducing and enlarging in print or photocopyingsuch that the scale factor needed to convert from A3 to A4, at 71% is the same as the scale factor to convert between A4 and A5, A5 and A6 and so on. The following link covers .
"Until the size system we have today came in in the late 1960's it seems as though manufacturers had a free rein. I have found a reference to postal letters being no smaller than 4 x 2 3/4 ins, presumably they might otherwise get lost. The John Dickinson Lion Brand envelope catalogue for March 1961 suggests sizes of 3 1/8 x 5 3/8, 3 1/2 x 6 which seems to have been made in a large range of papers and colours, 4 1/4 x 5 3/8, 4 x 6, 4 x 9.
Window envelopes 3 1/2 x 6 and 3 3/4 x 6 1/2 also 4 x 9.
Business Banker envelopes were in a variety of sizes from 4 x 9 up to 8 x 9
and pocket envelopes from 9 x 4 up to 15 x 10."
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 varietyof useful applications, such as the enlarging and reducing of images without any cutoff or margins, or folding to make a booklet of the next size down.
The A series paper sizes are defined by the area of A0 being 1 square metre. The areas of other sizes are then: area of An is 1 divided by two to the power of n. More information on .
The United States use their own standard paper sizes, Letter, Legal and Ledger/Tabloidbeing some of the most common. There is an ANSI standard with sizes A-E and architectural paper sizes, the Arch series again with sizes A-E. Both of these series have been extendedfor expediency with the additions of ANSI B+ and Arch E1. See for more information.
The purpose of this site is to explain current international standard paper sizes, covered by the , and to provide size charts to allow a quick lookup of sizes.
Billboards and posters use a variety of sizes some of which are in the standardpaper sizes (ISO, ANSI and Arch) others of which are specific to the poster and billboard forms, this is expecially true of movie posters. Click the followinglinks for and sizes.
Before the introduction of ISO 216 many paper sizes were in use around the world. were common in countries which had been part of the British Empire, Japan had traditional paper sizes and a variety of sizes were used across European countries.
Japan has developed its own standards for paper sizes. While the JIS (Japan Industrial Standard) A series of sizes is identical to the ISO/DIN A series of sizes, the JIS B series is not identical to the ISO B series; and Japan has no series of envelope sizes comparable to the ISO/DIN C series.