The size of A2 paper is 594mm × 420mm。 A2 paper refers to the paper of international general standard A2 specification, and its size is 594mm × 420mm, twice that of A3 paper.

The Chinese name of A2 paper is big four. A2 paper is to fold the paper of type a basic size twice, so the area of an A2 paper is one second of the power of 2 of the area of the basic paper, that is, 1 / 4 (4 open).

In national standards, drawings from small to large can generally be divided into A5, A4, A3, A2, A1 and A0, of which A0 is the largest. Generally, there are few drawings smaller than A3 (unless some special industries).

The specification of paper refers to that after the paper is made, it is trimmed and cut into a certain size. In the past, the size of paper was expressed by the number of "open" (such as 8 open or 16 open). China has adopted international standards, which stipulate A0, A1, A2, B1 and B2. And other marks to indicate the format specification of the paper. The standard stipulates that the proportional relationship between the width (expressed in x) and the length (expressed in Y) of the paper is X: y = 1: n.

Other paper sizes:

1. A0 is 1189mm * 841mm.

2. A1 is 841mm * 594mm.

3. A3 is 420mm * 297mm.

4. A4 is 294mm * 210mm.