B series of ISO paper sizes

See also: ISO paper sizes, history and rationale, A series of ISO paper sizes, C series of ISO paper sizes (envelopes), RA series of ISO paper sizes, Japanese paper sizes.

This series is secondary to the A series, “for use only in exceptional circumstances.” The sizes are geometric means between sizes in the A series. For example, the width of A1 is 594 mm, of A2, 420 mm. The width of B2 is set at the square root of the product of 594 and 420 =  499.47, which is rounded to 500 mm.

B0 1,000 mm × 1,414 mm
B1 707 mm × 1,000 mm
B2 500 mm × 707 mm
B3 353 mm × 500 mm
B4 250 mm × 353 mm
B5 176 mm × 250 mm
B6 125 mm × 176 mm
B7 88 mm × 125 mm
B8 62 mm × 88 mm
B9 44 mm × 62 mm
B10 31 mm × 44 mm

Unless other tolerances are specified, a tolerance of 

Japan has a different series of B sizes.

International Organization for Standardization.
ISO 216:1975
Writing paper and certain classes of printed matter--Trimmed sizes--A and B series.

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