C1
Dimensions: 648 × 917 mm (25.51 × 36.1 in)
C1 measures 648 × 917 mm (25.51 × 36.10 in) and belongs to the C Envelope Paper Sizes standard. It is commonly used for mailing a1 documents, folded if needed.
What size is C1 paper?
An C1 piece of paper measures 648 × 917 mm or 25.51 × 36.10 inches. It is part of the C Envelope Paper Sizes standard.
| Units | Width × Height |
|---|---|
| Metric millimeters (mm) | 648 × 917 mm |
| Metric centimeters (cm) | 64.80 × 91.70 cm |
| Metric meters (m) | 0.648 × 0.917 m |
| Imperial inches (in) | 25.51 × 36.10 in |
| Typographic points (1/72 inch) (pt) | 1836.85 × 2599.37 pt |
| Typographic picas (1/6 inch) (pc) | 153.07 × 216.61 pc |
| Pixels at 300 DPI (px) | 7,654 × 10,831 px |
C1 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)648 × 917 mm
- Size (inches)25.51 × 36.10 in
- Aspect ratio1 : 1.42
- StandardC Envelope Paper Sizes
- Common useDocuments, letters, forms
Compare C1 with other sizes
Typical uses for C1
C1 measures 648 × 917 mm (25.51 × 36.10 in) and is used for the following tasks.
- Mailing A1 documents, folded if needed
- Statements, invoices and letters
- Cards and invitations
- Direct-mail inserts
Printer tip
C1 needs a wide-format plotter or a commercial print service. Check the maximum roll width and supported media before sending the job.
C1 at common DPI
Pixel dimensions for C1 at popular resolutions. Rounded to whole pixels; physical sheet remains 648 × 917 mm.
| DPI | Width (px) | Height (px) |
|---|---|---|
| 72 | 1,837 | 2,599 |
| 96 | 2,449 | 3,466 |
| 150 | 3,827 | 5,415 |
| 300 | 7,654 | 10,831 |
| 600 | 15,307 | 21,661 |
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648 × 917 mm (25.51 × 36.1 in)