RuledSheet

B series paper sizes (B0 to B10)

B sizes sit between the A sizes: each B sheet is the geometric mean of the A size above and below it. B0 is 1000 × 1414 mm.

B series paper sizes (B0 to B10)
Sizemmcminchespx at 300 dpi
B01000 × 1414100 × 141.439.37 × 55.6711811 × 16701
B1707 × 100070.7 × 10027.83 × 39.378350 × 11811
B2500 × 70750 × 70.719.69 × 27.835906 × 8350
B3353 × 50035.3 × 5013.9 × 19.694169 × 5906
B4250 × 35325 × 35.39.84 × 13.92953 × 4169
B5176 × 25017.6 × 256.93 × 9.842079 × 2953
B6125 × 17612.5 × 17.64.92 × 6.931476 × 2079
B788 × 1258.8 × 12.53.46 × 4.921039 × 1476
B862 × 886.2 × 8.82.44 × 3.46732 × 1039
B944 × 624.4 × 6.21.73 × 2.44520 × 732
B1031 × 443.1 × 4.41.22 × 1.73366 × 520
B0B1B2B3B4B5
Drawn to the same scale.

What B series is used for

  • Posters (B1, B2)
  • Books and magazines
  • Passports: the ICAO passport booklet (ID-3) is B7, 88 × 125 mm

ISO B vs JIS B

Japan's JIS B series has the same proportions but 1.5 times the area of the ISO A size of the same number, so JIS B5 is 182 × 257 mm while ISO B5 is 176 × 250 mm. Notebooks and copiers labelled “B5” in Japan, China and Korea usually mean JIS B5.

Questions

Is B4 bigger than A4?

Yes. B4 is 250 × 353 mm, between A4 (210 × 297) and A3 (297 × 420).

What is C paper size?

C sizes are for envelopes: a C sheet is the geometric mean of the A and B sizes with the same number, so an A4 sheet fits a C4 envelope.