Imperial Paper Sizes

Imperial Size in cm, inches

Before the United Kingdom adopted the ISO 216 standard, British Imperial paper sizes were used. The Imperial paper sizes were used to define large sheets of paper, and the naming convention was derived from the sheet name, and how many times it was folded. For example 'Royal' paper is 508mm x 635mm, and when it is folded three times, it makes 8 sheets and goes by the name 'Royal Octavo' which is 253 mm x 158 mm. This is a name given to modern hardbound books.

Size	Millimeters	Inches
Antiquarian size	787 x 1346 mm	31 x 53 in
Atlas size	660 x 864 mm	26 x 34 in
Brief size	343 x 406 mm	13.5 x 16 in
Broadsheet size	457 x 610 mm	18 x 24 in
Cartridge size	533 x 660 mm	21 x 26 in
Columbier size	597 x 876 mm	23.5 x 34.5 in
Copy Draught size	406 x 508 mm	16 x 20 in
Crown size	381 x 508 mm	15 x 20 in
Demy size	445 x 572 mm	17.5 x 22.5 in
Double Demy size	572 x 902 mm	22.5 x 35.5 in
Quad Demy size	889 x 1143 mm	35 x 45 in
Elephant size	584 x 711 mm	23 x 28 in
Double Elephant size	678 x 1016 mm	26.7 x 40 in
Emperor size	1219 x 1829 mm	48 x 72 in
Foolscap size	343 x 432 mm	13.5 x 17 in
Small Foolscap size	337 x 419 mm	13.3 x 16.5 in
Grand Eagle size	730 x 1067 mm	28.7 x 42 in
Imperial size	559 x 762 mm	22 x 30 in
Medium size	470 x 584 mm	18.5 x 23 in
Monarch size	184 x 267 mm	7.2 x 10.5 in
Post size	394 x 489 mm	15.5 x 19.2 in
Sheet, Half Post size	495 x 597 mm	19.5 x 23.5 in
Pinched Post size	375 x 470 mm	14.8 x 18.5 in
Large Post size	394 x 508 mm	15.5 x 20 in
Double Large Post size	533 x 838 mm	21 x 33 in
Double Post size	483 x 762 mm	19 x 30 in
Pott size	318 x 381 mm	12.5 x 15 in
Princess size	546 x 711 mm	21.5 x 28 in
Quarto size	229 x 279 mm	9 x 11 in
Royal size	508 x 635 mm	20 x 25 in
Super Royal size	483 x 686 mm	19 x 27 in