Size Name | Times Sheet Folded | Leaves to Sheet | Pages to Sheet | Size of Page in Inches |
---|---|---|---|---|

royal folio | 1 | 2 | 4 | 20 x 12½ |

royal quarto | 2 | 4 | 8 | 12½ x 10 |

royal octavo | 3 | 8 | 16 | 10 x 6¼ |

royal sixteenmo | 4 | 16 | 32 | 6¼ x 5 |

royal thirty-twomo | 5 | 32 | 64 | 5 x 3 1/8 |

royal sixty-fourmo | 6 | 64 | 128 | 3 1/8 x 2½ |

medium folio | 1 | 2 | 4 | 18 x 11½ |

medium quarto | 2 | 4 | 8 | 11½ x 9 |

medium octavo | 3 | 8 | 16 | 9 x 5¾ |

medium sixteenmo | 4 | 16 | 32 | 5¾ x 4½ |

medium thirty-twomo | 5 | 32 | 64 | 4½ x 2 7/8 |

medium sixty-fourmo | 6 | 64 | 128 | 2 7/8 x 2¼ |

crown folio | 1 | 2 | 4 | 15 x 10 |

crown quarto | 2 | 4 | 8 | 10 x 7½ |

crown octavo | 3 | 8 | 16 | 7½ x 5 |

crown sixteenmo | 4 | 16 | 32 | 5 x 3¾ |

crown thirty-twomo | 5 | 32 | 64 | 3¾ x 2½ |

crown sixty-fourmo | 6 | 64 | 128 | 2½ x 1 7/8 |

Scale of the American Library Association

Size Name | Symbol | Outside Height* | Appx Size in Inches* |
---|---|---|---|

folio | F | over 30 cm | 12 x 19 |

quarto | Q | 25-30 cm | 9½ x 12 |

octavo | O | 20-25 cm | 6 x 9 |

imperial octavo | O | - | 8¼ x 11½ |

super octavo | O | - | 7 x 11 |

royal octavo | O | - | 6½ x 10 |

medium octavo | O | - | 6 1/8 x 9¼ |

crown octavo | O | - | 5 3/8 x 8 |

duodecimo | D | 17.5-20 cm | 5 x 7 3/8 |

duodecimo (large) | D | 17.5-20 cm | 5½ x 7½ |

sextodecimo | S | 15-17.5 cm | 4 x 6¾ |

octodecimo | T | 12.5-15 cm | 4 x 6½ |

trigesimo-segundo | Tt | 10-12.5 cm | 3½ x 5½ |

quadrasegisimo-octavo | Fe | 7.5-10 cm | 2½ x 4 |

sexagesimo-quarto | Sf | less than 7.5 cm | 2 x 3 |

*Approximate Size refers to the front cover's rectangular dimensions

Size Names and Their Equivalents

Old | Modern - Preferred by Printers | Abbr. | Symbol |
---|---|---|---|

folio | folio |
fo or f | - |

quarto | quarto | 4to | 4° |

sexto | sixmo | 6to or 6mo | 6° |

octavo | octavo | 8vo | 8° |

duodecimo | twelvemo | 12mo | 12° |

sextodecimo | sixteenmo | 16mo | 16° |

octodecimo | eighteenmo | 18mo | 18° |

vincesimo-quarto vigesimo-quarto | twenty-fourmo | 24mo | 24° |

trigesimo-segundo | thirty-twomo | 32mo | 32° |

quadragesimo-octavo | forty-eightmo | 48mo | 48° |

sexagesimo-quarto | sixty-fourmo | 64mo | 64° |

Double Elephant Folio up to 50" tall.

Atlas Folio up to 25" tall.

Elephant Folio 23" tall.

Folio up to 15" tall.

4to up to 12" tall. aka Quarto.

8vo up to 9½" tall. aka Octavo.

12mo up to 7½" tall. aka Duodecimo.

16mo up to 6½" tall. aka Sextodecimo

24mo up to 5½" tall. aka Trigesimo-secundo

32mo up to 5" tall. aka Trigesimo-secundo

48mo up to 4" tall.

64mo up to 3" tall.

(from *Collin's AUTHORS & PRINTERS DICTIONARY, OXFORD, 9th ed. 1946*:

64mo, 3½" x 2¼ "

Trigesimo-secundo, 32mo 4½" x 3"

Vigesimo-quarto, 24mo, 5" x 3½"

Vigesimo, 20mo, 5" x 3"

Sexto-decimo, 16mo, 6to, 9" x 7½"

Duo-decimo, 12mo, 7½" x 4½"

Crown 8vo 7½" x 5"

Crown 4to 10"x7½"

Demy 8vo 8¾" x 5½"

Demy 4to 11" x 8¾"

Foolscap 8vo 6¾" x 4¼ "

Foolscap 4to 8½" x 6¾"

Imperial 8vo 11" x 7½"

Imperial 4to 15" x 11

Medium 8vo 9½" x 6

Medium 4to 12" x 9½"

Post 8vo 8" x 5"

Post 4to 10" x 8"

Pott 8vo 6¼ " x4

Pott 4to 8" x 6¼ "

Royal 8vo 10" x 6¼ "

Royal 4to 12½" x 10

Super Royal 8vo 10¼ " x 6¾"

Super Royal 4to 13½" x 10¼ "

**FOLIOS**

Atlas 26" x 17"

Crown or post 15" x 10"

Demy 17½" 11¼ "

Elephant 23" x 14"

Foolscap 13½" x 8½"

Imperial 22" x 15"

Medium 18" x 11½"

Royal 20" x 12½"

**PRINTING PAPER SIZES:**

crown 20" x 15"

demy 22½" x 17½"

double crown 30" x 20"

double demy 35" x 22½"

doule foolscap 27" x 17"

double post 31½" x 19½"

double royal 40" x 25"

imperial 30 x 22"

medium 23½" x 18½"

post 19¼ " x 15½"

royal 25" x 20"

super-royal 27½" x 20½"

**WRITING PAPER SIZES:**

antiquarian 53" x 31"

atlas 34" x 26"

columbier 34½" x 23½"

copy or draft 20" x 16"

demy 20" x 15½"

double elephant 40" x 26¾"

elephant 28" x 23"

emperor 72" x 48"

foolscap 17" x 13½"

imperial 30" x 22"

medium 22" x 17½"

post, large 21" x 16½"

post, small 19" x 15¼ "

pott 15" x 12½"

royal 24" x 19"

super-royal 27" x 19"

**FOOLSCAP**

folio 13½" x 8½"

octavo 6¾" x 4¼ "

quarto 8"½" x 6¾"

The dimensions of books, as measured, in inches, centimeters, or millimeters, from head to tail and from spine to fore edges of the cover. The descriptions given to book sizes are based on a still currently used system that involves using the size of a leaf as a fraction of the folded sheet on which it was printed. With reference to the printing of books, an even number of leaves always results when a sheet is folded, i.e., 2, 4, 8, 16, etc., resulting in printed pages on each side of the leaf, i.e., 4, 8, 16, 32, etc. Except for the largest size, the FOLIO (1) , the name of the size indicates the fractional part of the sheet one leaf occupies, e.g., quarto (2 folds, 4 leaves, 8 pages),¼ of the sheet; octavo (3 folds, 8 leaves, 16 pages), 1/8 of the sheet, etc. In this system, since books are printed from different sizes of sheets (See: BOOK BASIS), the fractional designation by itself cannot denote an exact size; therefore it is a common practice to give the name of the sheet before the fractional name, e.g., royal octavo, which is an octavo 1/8 the size of a sheet 20 X 25 inches or, excluding the SQUARES, a book 10 x 6¼ inches (before trimming). Paper is cut to so many sizes, however, that the terms crown, royal, post, etc., unless qualified, are practically meaningless. (See: SIZES OF PAPER). Untrimmed sizes for three commonly used sheet sizes are given below. The customary trim of 1/8 inch at head and tail will reduce the height of the text block by¼ inch; however, the size of the bound book. assuming 1/8 inch squares will make the height of the book the same as the sizes given. It should be mentioned that not all sheet sizes given are folded to produce books of the very small size indicated. All folds, following the first, are right-angle folds.

The common book-trade designation of sizes was originally related to a sheet of handmade paper measuring 19 X 25 inches, which was the common size of the papermaking mold. When folded to 8 leaves, or 16 pages, and trimmed, each was 6½ X 9¼ inches, approximately, and was the standard dimension of an 8vo. When folded to make 16 leaves, or 32 pages, it was a 16 mo. With the present great variety of paper sizes, all dimensions are by necessity only approximate. (52, 69, 140, 156, 169)

Size (in inches) | Name | Times Folded | Leaves per Sheet | Pages per Sheet | Size of Untrimmed Page (leaf) |
---|---|---|---|---|---|

25 by 38 | folio | 1 | 2 | 4 | 25 by 19 |

25 by 38 | quarto | 2 | 4 | 8 | 19 by 12½ |

25 by 38 | octavo | 3 | 8 | 16 | 12½ by 9½ |

25 by 38 | sixteenmo | 4 | 16 | 32 | 9½ by 6¼ |

25 by 38 | thirty-twomo | 5 | 32 | 64 | 6¼ by 4¾ |

25 by 38 | sixty-fourmo | 6 | 64 | 18 | 4¾ by 3 1/8 |

20 by 25 | folio | 2 | 4 | 20 by 12½ | |

20 by 25 | quarto | 2 | 4 | 8 | 12½ by 10 |

20 by 25 | Octavo | 3 | 8 | 16 | 10 by 6¼ |

20 by 25 | sixteenmo | 4 | 16 | 32 | 6¼ by 5 |

20 by 25 | thirty-twomo | s | 32 | 64 | 2½ by 3 1/8 |

20 by 25 | sixty-fourmo | 6 | 64 | 128 | 3 1/8 by 2½ |

18 by 23 | folio | 2 | 4 | 18 by 11½ | |

18 by 23 | quarto | 2 | 4 | 8 | 11½ by 9 |

18 by 23 | octavo | 3 | 8 | 16 | 9 by 5¾ |

18 by 23 | sixteenmo | 4 | 16 | 32 | 5¾ by 4½ |

18 by 23 | thirty-twomo | 5 | 32 | 64 | 4½ by 2 7/8 |

18 by 23 | sixty-fourmo | 6 | 64 | 128 | 2 7/8 by 2¼ |

Size Name | Octavo Size | Quarto Size |
---|---|---|

pott | 6¼ by 4 | 8 by 6¼ |

foolscap | 6¾ by 4¼ | 8¼ by 6¾ |

crown | 7½ by 5 | 1O by 7½ |

large crown | 8 by 5¼ | 10½ by 8 |

large post | 8¼ by 5¼ | 10¼ by 8¼ |

demy | 8¾ by 5 5/8 | 11¼ by 8¾ |

post | 8 by 5 | 10 by 8 |

small demy | 8½ by 5 5/8 | 11¼ by 8½ |

medium | 9 by 5¾ | 11½ by 9 |

small royal | 9¼ by 6 1/8 | 12¼ by 9¼ |

royal | 10 by 6¼ | 12½ by 10 |

super royal | 10¼ by 6¾ | 13½ by 10¼ |

imperial | 11 by 7½ | 15 by 11 |