British/US Imperial Paper Sizes

 

Folio meant cut in half, quarto cut in quarters, sixmo cut in sixths and octavo cut in eights. For example:

Imperial = 30" x 22"
Imperial folio = 15" x 22"
Imperial quarto = 15" x 11"
Imperial octavo = 7.5" x 11"
You can also have Double (twice the size), Quad (four times the size) or Double Quad (eight times the size).

Foolscap was so called because it used to have a watermark showing a fool's head and cap. The most common paper sizes in offices were Foolscap (this was Foolscap folio 13.5 x 8.5 in) and Quarto, which was shorter than Foolscap but slightly wider.

Cut Cards Sizes Width x Height (Inches) Width x Height (Millimeters)
Thirds 1½ x 3 38.1 x 76.2
Ex-Thirds 1¾ x 3 44.45 x 76.2
Towns 2 x 3 50.8 x 76.2
Small 2 ⅜ x 3⅝ 60.325 x 92.075
Large 3 x 4½ 76.2 x 114.3
Court 3½ x 4½ 88.9 x 114.3
Double Small 3⅝ x 4¾ 92.075 x 120.65
Postcard 3½ x 5½ 88.9 x 139.7
Double Large 4½ x 6 114.3 x 152.4
Cabinet (Photo) 4¼ x 6½ 107.95 x 165.1
Quad Small 4¾ x 7¼ 120.65 x 184.15
Quad Large 6 x 9 152.4 x 228.6
Writing Papers Sizes    
Pott 12½ x 15 317.5 x 381
Double Pott 15 x 25 381 x 365
Foolscap 13¼ x 16½ 336.55 x 419.1
Double Foolscap 16½ x 26½ 419.1 x 673.1
Foolscap and Third 13¼ x 22 419.1 x 558.8
Foolscap and Half 13¼ x 24¾ 419.1 x 628.65
Pinched Post 14½ x 18½ 368.3 x 469.9
Post 15¼ x 19 387.35 x 482.6
Double Post 19 x 30½ 482.6 x 774.7
Large Post 16½ x 20¾ 419.1 x 527.05
Double Large Post 20¾ x 33 527.05 x 838.2
Copy 16¼ x 20 412.75 x 508
Medium 18 x 22½ 457.2 x 571.5
Cut Writing Papers Sizes    
Albert 6 x 4 152.4 x 101.6
Duke 7 x 5½ 177.8 x 139.7
Duchess 6 x 4½ 152.4 x 114.3
Foolscap Folio 13 x 8 330.2 x 203.2
Foolscap 4to 8 x 6½ 203.2 x 165.1
Large Post 4to 10 x 8 254 x 203.2
Large Post 8vo 8 x 5 203.2 x 127
Small Post 4to 9 x 7 228.6 x 177.8
Small Post 8vo 7 x 4½ 177.8 x 114.3
Book and Drawing Papers Sizes    
Foolscap 14 x 18¾ 355.6 x 476.25
Demy 15½ x 20 393.7 x 508
Medium 17½ x 22½ 444.5 x 571.5
Royal 19 x 24 482.6 x 609.6
Super Royal 19¼ x 27 488.95 x 685.8
Imperial 22 x 30¼ 558.8 x 768.35
Elephant 23 x 28 584.2 x 711.2
Double Elephant 26½ x 40 673.1 x 863.6
Atlas 26¼ x 34 666.75 x 863.6
Columbier 23½ x 35 596.9 x 889
Antiquarian 31 x 53 787.4 x 1346.2
Printing Papers Sizes    
Crown 16¼ x 21 412.75 x 533.4
Demy 17¾ x 22½ 450.85 x 571.5
Medium 18¼ x 23 463.55 x 584.2
Royal 20 x 25 508 x 635
Super Royal 21 x 27 533.4 x 685.8
Double Pott 15 x 25 381 x 635
Double Foolscap 17 x 27 431.8 x 685.8
Double Crown 20 x 30 508 x 762
Double Demy 22½ x 35½ 571.5 x 901.7
Cartridge Papers Sizes    
Foolscap 14 x 18¾ 355.6 x 476.25
Demy 17¾ x 22½ 450.85 x 571.5
Royal 19 x 24 482.6 x 609.6
Super Royal 19¼ x 27½ 488.95 x 698.5
Imperial 21 x 26 533.4 x 660.4
Elephant 23 x 28 584.2 x 711.2
Board    
Royal 20 x 25 508 x 635
Postal 22½ x 28½ 571.5 x 723.9
Imperial 22 x 30 558.8 x 762
Large Imperial 22 x 32 558.8 x 812.8
Index 25½ x 30½ 647.7 x 774.7

 

Paper Sizes in the United States

19th century

An article in the March 1854 issue of Scientific American listed the following sizes:

Paper Sizes Width x Height (Inches) Width x Height (Millimeters)
Foolscap 14 x 17 355.6 x 431.8
Crown 15 x 20 381 x 508
Folio Post 16 x 21 406.4 x 533.4
Demy 17 x 22 431.8 x 558.8
Medium 19 x 24 482.6 x 609.6
Royal 20 x 25 508 x 635
Super Royal 22 x 27 558.8 x 685.8
Imperial 22 x 32 558.8 x 812.8
Medium and Half 24 x 28½ 609.6 x 723.9
Royal and Half 25 x 29 635 x 736.6
Double Medium 24 x 38 609.6 x 965.2
Double Medium Super Royal 27 x 42 685.8 x 1066.8
Double Medium Imperial 32 x 44 812.8 x 1117.6

 

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