Paper - The Graphic Design: Reference and Specification - page 64

C0
917 × 1297 mm 36 1 ⁄ 8 " × 51"

C1
648 × 917 mm 25 1 ⁄ 2 " × 36 1 ⁄ 8 "

C2
458 × 648 mm 18" × 25 1 ⁄ 2 "
C3
324 × 458 mm 12 3 ⁄ 8 " × 18"
C4
229 × 324 mm
19" × 12 3 ⁄ 4 "

The C series is used for folders, postcards, and envelopes suitable for stationery in the A sizes. (For more information on the
C series as it pertains to envelopes, see Chapter 8, Envelopes and Folders.)

ISO C Sheet Sizes and Inch Equivalents

ISO Size Size (millimeters) Size (inches) approx.

C0 917 × 1297 36 1 ⁄ 8 × 51

C1 648 × 917 25 1 ⁄ 2 × 36 1 ⁄ 8

C2 458 × 648 18 × 25

C3 324 × 458 12 3 ⁄ 4 × 18

C4 229 × 324 9 × 12 1 ⁄ 2

C5 162 × 229 6 3 ⁄ 8 × 9

C6 114 × 162 4 1 ⁄ 2 × 6 3 ⁄ 8

C7 81 × 114 3 1 ⁄ 4 × 4 1 ⁄ 2

C8 57 × 81 2 1 ⁄ 4 × 3 1 ⁄ 4