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.
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).
Paper size is extremely important when printing international patterns. And A4 paper is the standard in every nearly other country besides the US. Yes, just like with the Imperial system and Farenheit scale, we Americans are the odd ducks in the pond on this issue. What is A4 Paper? So you’ve never heard of A4 paper?
A1, A2, A3, A4) measurement is determined by halving the dimensions of the preceding one. For example the most commonly used paper size is A4 (297mm x 210mm) and the next paper size is A5 (210mm x 148.5mm) which is equal to half of the A4 dimensions. The main uses of A, B and C paper sizes is their application to a particular print project.
A4 size paper is one-half of A3 size paper and one-quarter the size of A2 paper. A4 paper size has an allowance of plus or minus 1.5 millimeters or 0.06 inches on each side, and standard paper sizes are rounded to the nearest millimeter. Letter size paper is 17.6 millimeters shorter than A4 paper, and legal size is 58.6 millimeters longer.
In countries other than North America, A4 paper has historically been considered the international standard for letter size, as referenced in ISO 216, in which the International Organization for Standardization specifies all paper dimensions used globally.
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.
While you go about your day, happily printing away on Letter paper, almost everyone else will be printing the same material on A4. As you can see in the picture up the top, these two paper sizes actually have different dimensions. There is rhyme to the reason most countries have accepted the ISO 216 series of paper sizes (A4