C3
Dimensions: 324 × 458 mm (12.76 × 18.03 in)
C3 measures 324 × 458 mm (12.76 × 18.03 in) and belongs to the C Envelope Paper Sizes standard. It is commonly used for mailing a3 documents without folding.
What size is C3 paper?
An C3 piece of paper measures 324 × 458 mm or 12.76 × 18.03 inches. It is part of the C Envelope Paper Sizes standard.
| Units | Width × Height |
|---|---|
| Metric millimeters (mm) | 324 × 458 mm |
| Metric centimeters (cm) | 32.40 × 45.80 cm |
| Metric meters (m) | 0.324 × 0.458 m |
| Imperial inches (in) | 12.76 × 18.03 in |
| Typographic points (1/72 inch) (pt) | 918.43 × 1298.27 pt |
| Typographic picas (1/6 inch) (pc) | 76.54 × 108.19 pc |
| Pixels at 300 DPI (px) | 3,827 × 5,409 px |
C3 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)324 × 458 mm
- Size (inches)12.76 × 18.03 in
- Aspect ratio1 : 1.41
- StandardC Envelope Paper Sizes
- Common useDocuments, letters, forms
Compare C3 with other sizes
Typical uses for C3
C3 measures 324 × 458 mm (12.76 × 18.03 in) and is used for the following tasks.
- Mailing A3 documents without folding
- Posting drawings and proofs flat
- Packaging catalogues and portfolios
- Archive storage of large sheets
Printer tip
Most desktop printers cannot feed C3. Use a wide-format device or a print shop, and confirm the driver offers this exact size rather than a scaled substitute.
C3 at common DPI
Pixel dimensions for C3 at popular resolutions. Rounded to whole pixels; physical sheet remains 324 × 458 mm.
| DPI | Width (px) | Height (px) |
|---|---|---|
| 72 | 918 | 1,298 |
| 96 | 1,225 | 1,731 |
| 150 | 1,913 | 2,705 |
| 300 | 3,827 | 5,409 |
| 600 | 7,654 | 10,819 |
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324 × 458 mm (12.76 × 18.03 in)