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A4

In the A-series paper size, the ratio between length and width is 2 : 1.

 


Explanation

When a sheet of A4 paper is cut into two equal pieces (i.e. the surface halved), two sheets of A5 paper with exactly the same ratio in terms of dimensions are created.

2
1

So it must apply

 


Note

If you turn a corner of a sheet of A4 paper, you get a diagonal with length 2. So that is exactly the length of the sheet.

 
2
1

 


Other sizes

An A4 paper measures 297 mm by 210 mm. In the United States, the US letter format 279.4 mm by 215.8 mm is often used, which is 6 mm wider and 18 mm shorter.


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