'B' Paper Sizes

 

ISO paper sizes (plus rounded inch values)

Format B series
Size mm × mm in × in
0 1000 × 1414 39.4 × 55.7
1 707 × 1000 27.8 × 39.4
2 500 × 707 19.7 × 27.8
3 353 × 500 13.9 × 19.7
4 250 × 353 9.8 × 13.9
5 176 × 250 6.9 × 9.8
6 125 × 176 4.9 × 6.9
7 88 × 125 3.5 × 4.9
8 62 × 88 2.4 × 3.5
9 44 × 62 1.7 × 2.4
10 31 × 44 1.2 × 1.7

 

There is also the 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 (√0.5). 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.

 

'B' Sizes click to open.