Royal Octavo Book Size

Octavo(8vo / 8º / In-8) is a technical term describing the format of a book, which refers to the size of leaves produced from folding a full sheet of paper on which multiple pages of text were printed to form the individual sections (or gatherings) of a book.

According to royal octavo book format, the width of the book is 17cm (6 12 inches) and the height is 25cm (10 inches), as shown in the picture on the right.

Format/name Royal Octavo
Width 17cm (6 12 inches)
Height 25cm (10 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, Royal Octavo book size is about 2 times the width and 4.6 times the height of the credit card.

17cm book width and height 25cm

United States(US) Book Sizes

Format/Name Leaves Pages Approximate cover size (width × height)
inch × inch cm × cm mm × mm
folio(2º/ fo) 2 4 12 × 19 30 × 48 300 × 480
quarto(4º/ 4to) 4 8 9 12× 12 24 × 30 240 × 300
Imperial octavo(8º/ 8vo) 8 16 8 14×  11 12 21 × 29 210 × 290
Super octavo(8º/ 8vo) 7 × 11 18 × 28 180 × 280
Royal octavo(8º/ 8vo) 6 12× 10 17 × 25 170 × 250
Medium octavo(8º/ 8vo) 6 12×  9 14 17 × 23 170 × 230
octavo(8º/ 8vo) 6 × 9 15 × 23 150 × 230
Crown octavo(8º/ 8vo) 5 38× 8 14 × 20 140 × 200
duodecimo(12º/ 12mo / twelvemo) 12 24 5 ×  7 38 13 × 19 130 × 190
sextodecimo(16º/ 16mo / sixteenmo) 16 32 4 ×  6 34 10 × 17 100 × 170
octodecimo(18º/ 18mo / eighteenmo) 18 36 4 ×  6 12 10 × 17 100 × 170
trigesimo-secundo(32º/ 32mo / thirty-twomo) 32 64 3 12×  5 12 8.9 × 14 89 × 140
quadragesimo-octavo(48º/ 48mo / forty-eightmo) 48 96 2 12× 4 6.3 × 10 63 × 100
sexagesimo-quarto(64º/ 64mo / sixty-fourmo) 64 128 2 × 3 5.1 × 7.6 51 × 76

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