What size is a C9 envelope?
C9 measures 40 × 57 mm, or 1.57 × 2.24 inches.
C9 dimensions
Portrait
40 × 57 mm
- Millimetres
- 40 × 57 mm
- Centimetres
- 4 × 5.7 cm
- Inches
- 1.57 × 2.24 in
- Points
- 113 × 162 pt
- Picas
- 9.4 × 13.5 pc
- Pixels · 72 PPI
- 113 × 162 px at 72 PPI
- Pixels · 150 PPI
- 236 × 337 px at 150 PPI
- Pixels · 300 PPI
- 472 × 673 px at 300 PPI
How C9 fits
A C9 envelope is proportioned to contain an unfolded A9 sheet.
The diagram is illustrative; the written dimensions above are authoritative.
Common uses
- Mailing A9 documents
- Enclosures and presentation packs
Questions about C9
What is C9 in pixels at 300 DPI?
For image setup, C9 is 472 × 673 pixels at 300 PPI. DPI describes printer dots; PPI is the technically correct measure for an image file.
Which paper size fits a C9 envelope?
A C9 envelope holds an unfolded A9 sheet.
Can a C9 envelope be used landscape?
Yes. Rotate the envelope to 57 × 40 mm.
What is C9 commonly used for?
Common uses include mailing a9 documents and enclosures and presentation packs.