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See also: ISO paper sizes, history and rationale; A series of ISO paper sizes; B series of ISO paper sizes (envelopes); RA series of ISO paper sizes; Japanese paper sizes.
The C Series are envelope sizes designed to fit A series sheets of paper. See also envelope sizes in Europe.
| Size | Dimensions in mm |
Fits |
|---|---|---|
| C0 | 917 by 1297 | |
| C1 | 648 by 917 | |
| C2 | 458 by 648 | |
| C3 | 324 by 458 | |
| C4 | 229 by 324 | an A4 sheet, not folded |
| C5 | 162 by 229 | an A4 sheet folded in half; an A5 sheet, not folded |
| C6 | 114 by 162 | an A4 sheet folded in quarters; an A5 sheet folded in half; an A6 sheet, not folded |
| C7 | 81 by 114 | |
| C8 | 57 by 81 | |
| C9 | 40 by 57 | |
| C10 | 28 by 40 |
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Last revised: 28 July 2005.