What is the length and width of A4 paper?

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 Republic in 1922. Although some formats were developed in France at the same time, they were later forgotten. ф o 216defines three groups of paper sizes: a, b and c: Group C paper size is mainly used for envelopes.

Extended data:

1, folio is usually divided into three types according to size: large format, medium format and small format.

For 787× 1092 paper, 12 format is large format, 16 ~ 36 format is medium format, and 40 format is small format, but books with mainly characters are generally medium format. Folio shapes are rectangles with different proportions except 6 quarts, 12 quarts, 20 quarts, 24 quarts and 40 quarts, which are suitable for books with different properties and uses.

2. The specification of paper refers to that after paper is made, it is trimmed and cut into a certain size. How many "on" in the past (such as 8 on or 16 on, etc.). ) is used to indicate the size of the paper.

Nowadays, China has adopted international standards, and stipulated that A0, A 1, A2, B 1, B2 ... should use other marks to express paper format specifications. According to the standard, the proportional relationship between the width (represented by X) and the length (represented by Y) of paper is X: Y =1:N. ..

Baidu encyclopedia -A4 paper