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ISO 216 (DIN 476) “A”, “B” & ISO 269 “C” series paper sizes table

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  • Updated 2025-02-04 19:20 UTC

This is a list of common ISO 216 (DIN 476) “A” & “B” & ISO 269 “C” series of paper sizes. Did you know that if you multiply the length of the short side by the square root of 2, this calculates the length of the long side? For example, the short edge of a piece of ‘A4‘ is 210mm. Therefore the length of the long edge, to the nearest millimetre=210 x1.41421 = 297. It is this ‘magic number‘ of ‘root 2‘ which ensures the paper retains its aspect ratio every time, you cut it in two equal parts, across its longer edge. Invented by Germans, apparently…

Size Short-side Millimetres Long-side Millimetres Short-side Inches Long-side Inches
4A0 1682 2378 66.22 93.62
2A0 1189 1682 46.81 66.22
A0 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
 
B0 1000 1414 39.37 55.67
B1 707 1000 27.83 39.37
B2 500 707 19.69 27.83
B3 353 500 13.9 19.69
B4 250 353 9.84 13.9
B5 176 250 6.93 9.84
B6 125 176 4.92 6.93
B7 88 125 3.46 4.92
B8 62 88 2.44 3.46
B9 44 62 1.73 2.44
B10 31 44 1.22 1.73
 
C0 917 1297 36.1 51.06
C1 648 917 25.51 36.1
C2 458 648 18.03 25.51
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
C7/6 81 162 3.19 6.38
C8 57 81 2.24 3.19
DL 110 220 4.33 8.66

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