C Envelope Paper Sizes List

FormatWidth × Height (mm)Width × Height (inches)
C0917 × 129736.1 × 51.1
C1648 × 91725.5 × 36.1
C2458 × 64818.0 × 25.5
C3324 × 45812.8 × 18.0
C4229 × 3249.0 × 12.8
C5162 × 2296.4 × 9.0
C6114 × 1624.5 × 6.4
C781 × 1143.2 × 4.5
C857 × 812.2 × 3.2
C940 × 571.6 × 2.2
C1028 × 401.1 × 1.6
C Envelope Size illustration.