A Series is based on AO (841×1189), which is equivalent of a square meter in area, and each smaller size A1, A2, etc., is equal to half of
the predeing larger size.
Size
|
Millimeters
|
Inches
|
|
2A
|
1189*1682
|
46.81*66.22
|
|
20
|
841*1189
|
33.11*46.81
|
|
A1
|
594*841
|
23.39*33.11
|
|
A2
|
420*594
|
16.54*23.39
|
|
A3
|
297*420
|
11.69*16.54
|
|
A4
|
210*297
|
8.27*11.69
|
|
A5
|
148*210
|
5.83*8.27
|
|
A6
|
105*148
|
4.13*5.83
|
|
A7
|
74*105
|
2.91*4.13
|
|
A8
|
52*74
|
2.05*2.91
|
|
A9
|
37*52
|
1.46*2.05
|
|
A10
|
26*37
|
1.02*1.46
|
|
C series is for envelopes or folders suitable for enclosing stationery in the A sizes
Size
|
Millimeters
|
Inches
|
C3
|
324*458
|
12.76*18.03
|
C4
|
229*324
|
9.02*12.76
|
C5
|
162*229
|
6.38*9.02
|
C6
|
114*162
|
4.49*6.38
|
C7
|
81*114
|
3.19*4.49
|
DL
|
110*220
|
4.33*8.66
|