Book Sizes

Fold Symbol

Name

Outside height (inches)

64mo

sexagesimo-quarto

2 x 3

48mo

quadragesimo-octavo

2.5 x 4

32mo 

tricesimo-secondo

3.5 x 5.5

18mo

octodecimo

4 x 6.5

16mo 

sextodecimo

5 x 7.5

12mo

duodecimo

5 x 7.375

12mo (large) 

duodecimo

5.5 x 7.5

8vo

crown octavo

6 x 9

8vo

octavo

6 x 9

8vo 

medium octavo

6.125 x 9.25

8vo

royal octavo

6.5 x 10

8vo

super octavo

7 x 11

8vo 

imperial octavo

8.25 x 11.5

4to

quarto

9.5 x 12

fo.

folio 

12 x 19

fo.

elephant folio

23" to 25"

fo.

atlas folio 

25" to 50"

fo.

double elephant folio

50"+