C9
Dimensions: 40 × 57 mm (1.57 × 2.24 in)
C9 measures 40 × 57 mm (1.57 × 2.24 in) and belongs to the C Envelope Paper Sizes standard. It is commonly used for mailing a9 documents, folded if needed.
What size is C9 paper?
An C9 piece of paper measures 40 × 57 mm or 1.57 × 2.24 inches. It is part of the C Envelope Paper Sizes standard.
| Units | Width × Height |
|---|---|
| Metric millimeters (mm) | 40 × 57 mm |
| Metric centimeters (cm) | 4.00 × 5.70 cm |
| Metric meters (m) | 0.040 × 0.057 m |
| Imperial inches (in) | 1.57 × 2.24 in |
| Typographic points (1/72 inch) (pt) | 113.39 × 161.57 pt |
| Typographic picas (1/6 inch) (pc) | 9.45 × 13.46 pc |
| Pixels at 300 DPI (px) | 472 × 673 px |
C9 is part of the c envelope paper sizes standard. The C series envelope sizes are defined in ISO 269. C envelopes are designed to hold A series paper: a C4 envelope holds an A4 sheet, a C5 holds A5 or a folded A4, etc.
Quick facts
- Size (mm)40 × 57 mm
- Size (inches)1.57 × 2.24 in
- Aspect ratio1 : 1.43
- StandardC Envelope Paper Sizes
- Common useDocuments, letters, forms
Compare C9 with other sizes
Typical uses for C9
C9 measures 40 × 57 mm (1.57 × 2.24 in) and is used for the following tasks.
- Mailing A9 documents, folded if needed
- Statements, invoices and letters
- Cards and invitations
- Direct-mail inserts
Printer tip
Load envelopes one at a time or in the dedicated envelope slot, set the flap side correctly, and choose the exact envelope size in the driver.
C9 at common DPI
Pixel dimensions for C9 at popular resolutions. Rounded to whole pixels; physical sheet remains 40 × 57 mm.
| DPI | Width (px) | Height (px) |
|---|---|---|
| 72 | 113 | 162 |
| 96 | 151 | 215 |
| 150 | 236 | 337 |
| 300 | 472 | 673 |
| 600 | 945 | 1,346 |
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40 × 57 mm (1.57 × 2.24 in)