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Paper size

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There have been many standard sizes of paper at different times.

The international standard is ISO 216, which defines amongst other, A4. ISO paper sizes are all based on a single aspect ratio of the square root of two, 1:1.4142. The largest standard size, A0, has an area of 1 m. A1 is formed by cutting a piece of A0 in half, which retains the aspect ratio. This particular measurement system was chosen in order to allow folding of one standard size into another, which cannot be accomplished with traditional paper sizes.

The ISO B series is a scaling of the A series, B1 is half way between A0 and A1 in size. The C series is half way between the A and B series of the same number, for instance, C0 is half way between A0 and B0. This way C0 is slightly larger than A0, and B0 slightly larger than C0. This was intended to allow one to fit inside an envelope of the other. For instance, a letter written on A4 paper, the standard for this role, fits inside a C4 envelope. A C4 envelope can fit inside a B4 envelope.

International Paper Sizes

NameSize (mm)
A0841 1189 B01000 1414 C0917 1297
A1594 841 B1707 1000 C1648 917 D1545 779
A2420 594 B2500 707 C2458 648 D2385 545
A3297 420 B3353 500 C3324 458 D3272 385 E3400 560
A4210 297 B4250 353 C4229 324 D4192 272 E4280 400
A5148 210 B5176 250 C5162 229 D5136 192 E5200 280
A6105 148 B6125 176 C6114 162 D6 96 136 E6140 200
A774 105 B788 125 C781 114 D768 96
A852 74 B862 88 C857 88
A937 52 B944 62 C940 57
A1026 37 B1031 44 C1028 40

US Paper Sizes

NameSize (inches)Size (mm)
Quarto10 8254.0 203.2
Foolscap13 8330.2 203.2
Letter8.5 11215.9 279.4
Legal8.5 14215.9 355.6
Ledger / Tabloid11 17279.4 431.8
Executive7.25 10.5184.15 266.7
Post15.5 19.25393.7 488.95
Crown15 20381.0 508.0
Large post16.5 21419.1 533.4
Demy17.5 22.5444.5 571.5
Medium18 23457.2 584.2
Royal20 25508.0 635.0
Elephant23 28584.2 711.2
Double Demy23.5 35596.9 889.0
Quad Demy35 45889.0 1143.0
A8.5 11215.9 279.4
B11 17279.4 431.8
C17 22431.8 558.8
D22 34558.8 863.6
E34 44863.6 1117.6



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