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.
|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|
Copyright © 2000 Sizes, Inc. All rights reserved.
Last revised: 28 July 2005.