C4
Dimensions: 229 × 324 mm (9.02 × 12.76 in)
C4 measures 229 × 324 mm (9.02 × 12.76 in) and belongs to the C Envelope Paper Sizes standard. It is commonly used for posting a4 letters and contracts flat.
What size is C4 paper?
An C4 piece of paper measures 229 × 324 mm or 9.02 × 12.76 inches. It is part of the C Envelope Paper Sizes standard.
| Units | Width × Height |
|---|---|
| Metric millimeters (mm) | 229 × 324 mm |
| Metric centimeters (cm) | 22.90 × 32.40 cm |
| Metric meters (m) | 0.229 × 0.324 m |
| Imperial inches (in) | 9.02 × 12.76 in |
| Typographic points (1/72 inch) (pt) | 649.13 × 918.43 pt |
| Typographic picas (1/6 inch) (pc) | 54.09 × 76.54 pc |
| Pixels at 300 DPI (px) | 2,705 × 3,827 px |
C4 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)229 × 324 mm
- Size (inches)9.02 × 12.76 in
- Aspect ratio1 : 1.41
- StandardC Envelope Paper Sizes
- Common useDocuments, letters, forms
Compare C4 with other sizes
Typical uses for C4
C4 measures 229 × 324 mm (9.02 × 12.76 in) and is used for the following tasks.
- Posting A4 letters and contracts flat
- Mailing certificates and portfolios
- Sending application packs without creasing
- Courier documents that must stay flat
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.
C4 at common DPI
Pixel dimensions for C4 at popular resolutions. Rounded to whole pixels; physical sheet remains 229 × 324 mm.
| DPI | Width (px) | Height (px) |
|---|---|---|
| 72 | 649 | 918 |
| 96 | 866 | 1,225 |
| 150 | 1,352 | 1,913 |
| 300 | 2,705 | 3,827 |
| 600 | 5,409 | 7,654 |
Last reviewed:
Share C4 Paper Size
229 × 324 mm (9.02 × 12.76 in)