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B Format

129 x 198 mm
/
5.1 x 7.8 inch

With dimensions of approximately 5.1" x 7.8" (129mm x 198mm), the B Format has a surface area around 40 square inches or 258 square cm. Part of the ISO 216 standard paper sizes, B Formats are derived by halving the area of the next larger A size. Scaling down mathematically saves paper efficiently. Especially popular outside North America for trade paperbacks, B Format hits a versatile sweet spot between mass market books and larger formats. Originating from German efforts to standardize in the 1920s, B Formats align with the metric system. The 5.1" x 7.8" size can comfortably fit around 225-300 pages printed on both sides. With wide adoption globally but less so in the US, B Formats work well for paperback novels, handbooks, and other publications where compactness plus smooth readability are desired. Its success stems from striking an optimal balance between portable dimensions and legible text formatting. The ISO B Standards streamline consistent sizing between books, binders, boxes and more.

All Book Page Sizes
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Quarto
in
8.5 x 11
Octavo
in
6 x 9
Duodecimo
in
5 x 7.5
Sextodecimo
in
4.5 x 6.8
32mo
in
4 x 6
24mo
in
5 x 8
16mo
in
6.5 x 9.5
12mo
in
7.5 x 9.5
18mo
in
6.8 x 9.5
Imperial Octavo
in
6.8 x 10
Royal Octavo
in
7.5 x 10
Demy
in
8.5 x 11
Medium Octavo
in
7 x 10
Super Royal
in
9 x 12
Elephant Folio
in
14 x 20
Thumb Bible
in
1.5 x 2.5
Folio
in
12 x 19
A Format
mm
110 x 178
B Format
mm
129 x 198
C Format
mm
135 x 216
48mo
in
2.5 x 4
64mo
in
2 x 3
Crown Octavo
in
5.4 x 8
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