Compare C9 Dimensions
Compare C9 size (C Envelope Paper Sizes) side-by-side with other international formats and reference objects.
Paper Sizing Converters
C9
40 mm × 57 mm
40 mm
Letter
216 mm × 279 mm
216 mm
Credit Card
86 mm
Aspect Ratio
1 : 1.43
Primary format (C9). Comparison aspect ratio is 1 : 1.29.
Digital Output Pixels
472 px × 673 px
300 DPI