All sizes are approximate.4to, Qto. . . . . . quarto size (9" x 12" or 22.9cm x 30.5cm)
8vo, Oct. . . . . . octavo size (6" x 9" or 15.2cm x 22.9cm)
12mo . . . . . duodecimo size (5" x 7 .5" or 12.7cm x 19.1cm)
16mo . . . . . sextodecimo (4.25" x 6.75" or 10.8cm x 17.2cm)
24mo . . . . . twentyfourmo (3.5" x 6" or 8.9cm x 15.2cm)
32mo . . . . . thirtytwomo (3.25" x 5" or 8.3cm x 12.7cm)
64mo . . . . . sixtyfourmo (2" x 3" or 5.1cm x 7.6cm)
Atlas folio . . . . 16" x 25" or 40.6cm x 63.5cm
Elephant folio . . . 14" x 25" or 35.6cm x 63.5cm
Folio (Fo., Fol.) . 12" x 15" or 30.5cm x 38.1cm