The format size stipulated by the state is an international standard series, which has been incorporated into the national industry standard GB/T 1999 and implemented nationwide.

At present, the format specifications of books and periodicals are mainly series specifications, as follows:

a3(8k)420mm×297mm；

a4( 16k)297mm×2 10mm；

a5(32k)2 10mm× 148mm；

a6(64k) 144mm× 105mm；

Note: The size of A3(8k) has not been determined, generally it is 420mm×297mm.

Extended data:

A4 paper is defined by ISO 2 16, and its specification is 21* 29.7 cm (210 mm× 297 mm). Most countries in the world use this international standard for paper size. This standard was first incorporated into DIN (DIN 476) by Weimar * * and China in 1922. Although some formats were developed in France at the same time, they were later forgotten. O 2 16 defines three groups of paper sizes: A, B and C. Group C paper size is mainly used for envelopes.

Paper: Paper ZH ǐ is a thin sheet made of plant fiber, which is used for writing pictures, printing books and newspapers, packaging, etc. Paper: the general term for paper. Paper is counted by sheets, so it is called. Paper is generally divided into relief printing paper, newsprint, offset printing paper, coated paper, book cover paper, bible paper, copy paper, paperboard and so on.

References:

Laws and regulations-Book Layout and Layout Size approved by the National Bureau of Standards and Baidu Encyclopedia-Layout Size