International standards ISO 216 and ISO 269 specify 3 different paper sizes
A Series
This is the most common and well known series of paper sizes, the largest of which is the A0 which has an area of one square metre. The series is defined in the following diagram were A1 is half the size of A0, A2 is half the size of A1 and so on.
A0
841 × 1189
A1
594 × 841
A2
420 × 594
A3
297 × 420
A4
210 × 297
A5
148 × 210
A6
105 × 148
A7
74 × 105
A8
52 × 74
A9
37 × 52
A10
26 × 37
(note all sizes are in mm)
B Series
B0
1000 × 1414
B1
707 × 1000
B2
500 × 707
B3
353 × 500
B4
250 × 353
B5
176 × 250
B6
125 × 176
B7
88 × 125
B8
62 × 88
B9
44 × 62
B10
31 × 44
This series is secondary to the A series. The sizes are geometric means between sizes in the A series. For example, the width of A1 is 594 mm, of A2, 420 mm. The width of B2 is set at = 499.47, which is rounded to 500 mm.
(note all sizes are in mm)
C Series
C0
917 × 1297
C1
648 × 917
C2
458 × 648
C3
324 × 458
C4
229 × 324
C5
162 × 229
C6
114 × 162
C7/6
81 × 162
C7
81 × 114
C8
57 × 81
C9
40 × 57
C10
28 × 40
DL
110 × 220
The C series formats are geometric means between the B series format with the same number and the A series format with the same number, e.g. C2 is the geometric mean between B2 and A2. The C series formats are used mainly for envelopes. An A4 page will fit into a C4 envelope. If you fold the A4 page so that it is A5 in size, it will fit in a C5 envelope and so on.
(note all sizes are in mm)
applicability
Prior to the adoption of ISO 216, many different paper formats were used internationally. These formats did not fit into a coherent system and were defined in terms of non-metric units. The ISO 216 formats are organized around the ratio 1:√2; two sheets next to each other together have the same ratio, sideways. This simplifies copying two A4 sheets in reduced size on one, and copying an A4 sheet in magnified size on an A3 sheet or copying half an A4 sheet in magnified size on an A4 sheet. The principal countries not generally using the ISO paper sizes are the United States of America and Canada, which use the Letter, Legal, and Executive system. (Canada uses a P-series of sizes, which are the American paper sizes rounded to metric dimensions.)
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