Books Paper Sizes

Folio 304.8 × 482.6 mm Quarto 241.3 × 304.8 mm Imperial Octavo 209.55 × 292.1 mm Super Octavo 177.8 × 279.4 mm Royal Octavo 165.1 × 254 mm Medium Octavo 165.1 × 234.95 mm Octavo 152.4 × 228.6 mm Crown Octavo 136.525 × 203.2 mm 12mo 127 × 187.325 mm 16mo 101.6 × 171.45 mm 18mo 101.6 × 165.1 mm 32mo 88.9 × 139.7 mm 48mo 63.5 × 101.6 mm 64mo 50.8 × 76.2 mm A Format 110 × 178 mm B Format 129 × 198 mm C Format 135 × 216 mm

Further Information

There are a series of common terms to describe the sizes of modern books. These range from folio, which is the largest, to quarto, and octavo, which are respectively smaller. Book sizes are usually measured by the height and width of a leaf, or the height and width of its cover. The size and proportions of a book depends on the size of the original sheet of paper that was used to produce the book. The most common book sizes today are octavo and quarto. However, many books are still produced in larger and smaller sizes. There are some other terms for book sizes. These include elephant folio (up to 23 inches tall), atlas folio (25 inches tall), and a double elephant folio (50 inches tall). The B-format, such as the Penguin Classics, are 129mm by 198mm, which are a common paperback size in the UK.

Format	Width × Height (mm)	Width × Height (in)
Folio	304.8 × 482.6 mm	12 × 19 in
Quarto	241.3 × 304.8 mm	9.5 × 12 in
Imperial Octavo	209.55 × 292.1 mm	8.3 × 11.5 in
Super Octavo	177.8 × 279.4 mm	7 × 11 in
Royal Octavo	165.1 × 254 mm	6.5 × 10 in
Medium Octavo	165.1 × 234.95 mm	6.5 × 9.3 in
Octavo	152.4 × 228.6 mm	6 × 9 in
Crown Octavo	136.525 × 203.2 mm	5.4 × 8 in
12mo	127 × 187.325 mm	5 × 7.4 in
16mo	101.6 × 171.45 mm	4 × 6.8 in
18mo	101.6 × 165.1 mm	4 × 6.5 in
32mo	88.9 × 139.7 mm	3.5 × 5.5 in
48mo	63.5 × 101.6 mm	2.5 × 4 in
64mo	50.8 × 76.2 mm	2 × 3 in
A Format	110 × 178 mm	4.3 × 7 in
B Format	129 × 198 mm	5.1 × 7.8 in
C Format	135 × 216 mm	5.3 × 8.5 in