C series of ISO paper sizes

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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