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A4 size paper: The standard size of typing paper adopted by the International Standards Organization. It measures 210 mm wide and 297 mm longl (about 8 1/4 x 11 3/4 inches). It is used in most countries of the world, except the US and some neighboring countries where letter-size paper (8 1/2 x 11 inch) is used. See also paper sizes.


Dimensions of the A series paper sizes 4A0, 2A0, A0, A1, A2, A3, A4, A5, A6, A7, A8, A9 and A10 in both inches and mm, cm measurements can be obtained from the mm values and feet from the inch values.


A4 paper is the standard paper size used worldwide, with the exception of countries in North America. The US, Canada, and Mexico have standardized 8.5 inch by 11 inch (about 21.5 cm by 27.9 cm) paper, typically referred to as "letter" size.


The most commonly used paper size in North America is letter size. This is 8.5 by 11 inches and is what one uses for everything from standard, school-size binders to writing business letters.Legal is less common, but it’s the same width, 8.5 inches, while being 14 inches long. As its name suggests, it’s largely used for legal documents and is the mainstay of law firms and other legal entities.


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).


Rounded to millimetres the A0 paper size is 841 by 1,189 millimetres (33.1 × 46.8 in). Successive paper sizes in the series A1, A2, A3, and so forth, are defined by halving the preceding paper size along the larger dimension. The most frequently used paper size is A4 (210 × 297 mm).


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.


The B series was brought into being to provide a wider range of paper sizes, where as the C series is used only for envelopes. The B paper sizes are a bit larger than their A series counterparts and are based on the geometric mean of two consecutive A series sheets. For example, B4 is between A3 and A4 in size, and B5 is between A4 and A5.


B Series Paper Sizes Definition. The B series paper sizes are defined in ISO 216 in the following way. The B series paper sizes were created in order to provide paper sizes that weren't covered by the A series, but also use an aspect ratio of 1:root2. B sizes are defined as size B(n) being the geometric mean of size A(n) and size A(n-1).


The Japanese have adopted the same range of paper sizes in their JIS P 0138-61 standard. By folding an A4 in two along its shortest side, you create an A5 document. Two A4 pages next to each other in a spread equals the A3 paper size. This way a range of paper sizes is created from A0 (which has a surface of one square meter) to A10.