Compare C4 Dimensions
Compare C4 size (C Envelope Paper Sizes) side-by-side with other international formats and reference objects.
Paper Sizing Converters
C4
229 mm × 324 mm
229 mm
Letter
216 mm × 279 mm
216 mm
Credit Card
86 mm
Aspect Ratio
1 : 1.41 (√2)
Primary format (C4). Comparison aspect ratio is 1 : 1.29.
Digital Output Pixels
2705 px × 3827 px
300 DPI