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 TomFolio.com

Abbreviation  Format Name  Description 
Folio  Folio  A book up to 15" tall 
4to  Quarto  A book up to 12" tall 
sm4to  Small Quarto  A book up to 10" tall 
8vo  Octavo  A book up to 9 3/4" tall 
sm8vo  Small Octavo  A book up to 8" tall 
12mo  Duodecimo  A book up to 7 3/4" tall 
16mo  Sextodecimo  A book up to 6 3/4" tall 
24mo  Vigesimoquarto  A book up to 5 3/4" tall 
32mo  Trigesimosegundo  A book up to 5" tall. 
48mo  Quadragesimooctavo  A book up to 4" tall 
64mo  Sexagesimoquarto  A book up to 3" tall 
Seldom Seen Large Animals  Elephant Folio  A book up to 23" tall 
Atlas Folio  A book up to 25" tall  
Double Elephant Folio  A book up to 50" tall 
FORMATS  TALL  OBLONG  SMALL  NARROW  SQUARE  EXTRA 
TALL FORMATS Folio, 8vo., 24mo., 32mo. 
Same shape, but proportionally a little taller  Same shape and dimensions, but bound along one of the shorter edges  Same shape, but proportionally a little shorter  Same height, but a little narrower  Not Applicable  Same shape, but proportionally more than just a little taller, shorter, etc. 
SQUARISH FORMATS 4to., 12mo., 16mo., 48mo., 64mo. 
Same shape, but proportionally a little taller  Same shape and dimensions, but bound along one of the shorter edges  Same shape, but proportionally a little shorter  Not Applicable  Just enough wider to make a square format.  Same shape, but proportionally more than just a little taller, shorter, etc. 