B4 (International paper size: B), paper size
There is also a much less common B series. The area of B series sheets is the geometric mean of successive A series sheets. So, B1 is between A0 and A1 in size, with an area of 0.71 m² (). As a result, B0 has one side 1-metre long, and other sizes in the B series have one side that is a half, quarter or eighth of a metre. While less common in office use, it is used for a variety of special situations. Many posters use B-series paper or a close approximation, such as 50 cm×70 cm; B5 is a relatively common choice for books. The B series is also used for envelopes and passports.
International paper size: A
International paper size: B
International paper size: C
North American paper sizes
-
×1.46
-
×1.15
-
×0.73
-
×0.73
-
×1.46
-
×0.73
-
×0.73
-
×0.37
-
×0.18
-
×0.09
-
×0.12
-
×2.92
-
×1.71
-
×1.27
-
×0.55
-
×0.46
-
×0.46
-
×0.35
-
×0.33
-
×0.32
-
×0.27
-
×0.21
-
×0.17
-
×0.09
Japanese paper sizes
Inch based paper sizes
-
×0.04
-
×0.08
-
×0.11
-
×0.13
-
×0.15
-
×0.17
-
×0.21
-
×0.2
-
×0.23
-
×0.25
-
×0.3
-
×0.24
-
×0.27
-
×0.32
-
×0.43
-
×0.5
-
×0.6
-
×0.62
-
×0.63
-
×0.73