What size is a C1 envelope?
C1 measures 648 × 917 mm, or 25.51 × 36.10 inches.
C1 dimensions
Portrait
648 × 917 mm
- Millimetres
- 648 × 917 mm
- Centimetres
- 64.8 × 91.7 cm
- Inches
- 25.51 × 36.10 in
- Points
- 1837 × 2599 pt
- Picas
- 153.1 × 216.6 pc
- Pixels · 72 PPI
- 1837 × 2599 px at 72 PPI
- Pixels · 150 PPI
- 3827 × 5415 px at 150 PPI
- Pixels · 300 PPI
- 7654 × 10831 px at 300 PPI
How C1 fits
A C1 envelope is proportioned to contain an unfolded A1 sheet.
The diagram is illustrative; the written dimensions above are authoritative.
Common uses
- Mailing A1 documents
- Enclosures and presentation packs
Questions about C1
What is C1 in pixels at 300 DPI?
For image setup, C1 is 7654 × 10831 pixels at 300 PPI. DPI describes printer dots; PPI is the technically correct measure for an image file.
Which paper size fits a C1 envelope?
A C1 envelope holds an unfolded A1 sheet.
Can a C1 envelope be used landscape?
Yes. Rotate the envelope to 917 × 648 mm.
What is C1 commonly used for?
Common uses include mailing a1 documents and enclosures and presentation packs.