C9 Paper Size, Dimensions and Format (C series)

C9 in millimetres

40 x 57 mm




Aspect ratio 1:1.43
Area (A) 2,280 mm²
Perimeter (P) 194 mm
Diagonal (d) 69.63 mm


The C9 format measures 40 x 57 mm or inches. An C9 paper fromat has an aspect ratio of 1:1.43. The Area of the C9 paper size is 2,280 mm² or 3.52 in² with a perimeter of 194 mm or 7.60 in. An C9 format has a diagonal length of 69.63 mm or 2.72 in. The C9 size belongs to the C series. In the C series there are a total of 11 paper sizes.

Other C Paper Sizes

There are a total of 11 C Paper Sizes.