B-format Book Size(UK)

United Kingdom books use a variety of size standards, the most commonly used is the B format size, the United Kingdom B format size (210x135mm 8.26×5.31 inches) is slightly larger than the US B format size (198x129mm 7.79×5.07 inches), in addition to these sizes, the United Kingdom will also use Some American book sizes such as octavo, quarto, etc.

According to B-format book format, the width of the book is 12.9cm (5 18 inches) and the height is 19.8cm (7 34 inches), as shown in the picture on the right.

Format/name B-format
Width 12.9cm (5 18 inches)
Height 19.8cm (7 34 inches)

Our commonly used credit card size is 85.6 mm x 53.98 mm (3.4 in x 2.1 in). Using the credit card size as a reference, B-format book size is about 1.5 times the width and 3.7 times the height of the credit card.

12.9cm book width and height 19.8cm

United Kingdom(UK) Book Sizes

Format/Name cm × cm mm × mm inch × inch Aspect ratio
A 11 × 17.8 110 × 178 4 38× 7 ϕ∶1
B 12.9 × 19.8 129 × 198 5 18×  7 34 1.535
C 13.5 × 21.6 135 × 216 5 38×  8 12 8∶5

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