What size is a C3 envelope?
C3 measures 324 × 458 mm, or 12.76 × 18.03 inches.
C3 dimensions
Portrait
324 × 458 mm
- Millimetres
- 324 × 458 mm
- Centimetres
- 32.4 × 45.8 cm
- Inches
- 12.76 × 18.03 in
- Points
- 918 × 1298 pt
- Picas
- 76.5 × 108.2 pc
- Pixels · 72 PPI
- 918 × 1298 px at 72 PPI
- Pixels · 150 PPI
- 1913 × 2705 px at 150 PPI
- Pixels · 300 PPI
- 3827 × 5409 px at 300 PPI
How C3 fits
A C3 envelope is proportioned to contain an unfolded A3 sheet.
The diagram is illustrative; the written dimensions above are authoritative.
Common uses
- Mailing A3 documents
- Enclosures and presentation packs
Questions about C3
What is C3 in pixels at 300 DPI?
For image setup, C3 is 3827 × 5409 pixels at 300 PPI. DPI describes printer dots; PPI is the technically correct measure for an image file.
Which paper size fits a C3 envelope?
A C3 envelope holds an unfolded A3 sheet.
Can a C3 envelope be used landscape?
Yes. Rotate the envelope to 458 × 324 mm.
What is C3 commonly used for?
Common uses include mailing a3 documents and enclosures and presentation packs.