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Standard paper sizes for printing (ISO)

Here's a quick guide to the most used standard

The C series is used only for envelopes. The area of C series sheets is the geometric mean of the areas of the A and B series sheets of the same number. This means that C4 is slightly larger than A4, and B4 slightly larger than C4. Practically this means that a letter written on A4 paper it fits inside a C4 envelope, and a C4 envelope fits inside a B4 envelope.

  A (mm x mm) B (mm x mm) C (mm x mm)
0 841 x 1189 1000 x 1414 917 x 1297
1 594 x 841 707 x 1000 648 x 917
2 420 x 594 500 x 707 458 x 648
3 297 x 420 353 x 500 324 x 458
4 210 x 297 250 x 353 229 x 324
5 148 x 210 176 x 250 162 x 229
6 105 x 148 125 x 176 114 x 162
7 74 x 105 88 x 125 81 x 114
8 52 x 74 62 x 88 57 x 81
9 37 x 52 44 x 62 40 x 57
10 26 x 37 31 x 44 28 x 40

The ISO standard specifies the following tolerances:

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