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Although metric, based on the A4 paper size, and named to suggest that it is part of the official ISO 216 paper sizes, it is only a de facto standard. It is often referred to as (metric) "foolscap" or "folio" because of its similarity to the traditional foolscap folio size of 8 + 1 ⁄ 2 in × 13 + 1 ⁄ 2 in (216 mm × 343 mm).
Today, octavo and quarto are the most common book sizes, but many books are produced in larger and smaller sizes as well. Other terms for book size have developed, an elephant folio being up to 580 mm (23 in) tall, an atlas folio 640 mm (25 in), and a double elephant folio 1,300 mm (50 in) tall.
The term "folio" as applied to such books may refer simply to the size, i.e., books that are approximately 15 inches (38 cm) tall. At present, the term folio in the context of paper size is commonly used to refer to foolscap folio, which is print paper sized 8.5×13.5 in (216×343 mm), slightly larger (by 18.7%) than A4 paper.
Successive paper sizes in the series (A1, A2, A3, etc.) are defined by halving the area of the preceding paper size and rounding down, so that the long side of A(n + 1) is the same length as the short side of An. Hence, each next size is nearly exactly half the area of the prior size. So, an A1 page can fit two A2 pages inside the same area.
A folio volume is typically 15 in (38 cm) or more in height, the largest book of regular dimensions. A quarto volume (eight-page signature) is typically 9 by 12 in (23 by 30 cm), about the size of a modern magazine.
Octavo metrics compared to the folio and quarto. Octavo, a Latin word meaning "in eighth" or "for the eighth time", [1] (abbreviated 8vo, 8º, or In-8) is a technical term describing the format of a book, which refers to the size of leaves produced from folding a full sheet of paper on which multiple pages of text were printed to form the individual sections (or gatherings) of a book.
The Canadian standard CAN2 9.60-M76 and its successor CAN/CGSB 9.60-94 "Paper Sizes for Correspondence" specified paper sizes P1 through P6, which are the U.S. paper sizes rounded to the nearest 5 mm. [32] All custom Canadian paper size standards were withdrawn in 2012.
The actual size of a quarto book depends on the size of the full sheet of paper on which it was printed. A demy quarto (abbreviated demy 4to) is a chiefly British term referring to a book size of about 11.25 by 8.75 inches (286 by 222 mm), a medium quarto 9 by 11.5 inches (230 by 290 mm), a royal quarto 10 by 12.5 inches (250 by 320 mm), and a ...