C9
40 mm
57 mm
What Size Is C9 Paper?
C9, part of the C Series under the C Envelope Paper Sizes group, measures 40 x 57 mm, which is 4.0 x 5.7 cm or approximately 1.57 x 2.24 inches. It follows the ISO 269 specification and has an area of approximately 22.8 cm².
C9 Paper Size Dimensions & Conversions
Paper Series
C Series
Standard
ISO 269
Width
40 mm
Height
57 mm
Area
22.8 cm²
Aspect Ratio
1:1.425
Previous Size
C8
Next Size
C10
C9 Dimensions in Different Units
| Unit | Width | Height |
|---|---|---|
| Millimeters | 40 mm | 57 mm |
| Centimeters | 4.0 cm | 5.7 cm |
| Inches | 1.57 in | 2.24 in |
| Feet | 0.13 ft | 0.19 ft |
| Meters | 0.04 m | 0.057 m |
| Points | 113 pt | 162 pt |
| Picas | 9.4 pc | 13.5 pc |
What Is C9 Paper Used For?
Mailing Documents
This C-series envelope size is designed to hold its matching A-series paper size without folding.
Design and Layout
Designers and print professionals use C9 when a layout calls for this specific format.
Reproduction and Scaling
C9 can be scaled up or down to produce related sizes in the same series.
Presentations and Displays
C9 is suitable for boards, handouts, or displays sized to this format.
Archiving and Filing
Printed materials in C9 are stored and filed using standard folders sized for this format.
Digital Reference
C9 dimensions are used as a page-size preset in design and publishing software.
Related C Series Sizes
Frequently Asked Questions
What is C9 size in inches?
C9 measures approximately 1.57 x 2.24 inches.
What is C9 size in centimeters?
C9 measures 4.0 x 5.7 cm.
What is C9 size in millimeters?
C9 measures 40 x 57 mm.
What is C9 size in pixels?
At 300 DPI, C9 is approximately 471 x 672 pixels.
Is C9 bigger than C10?
Yes. C9 is larger in area than C10 in the C Envelope Paper Sizes series.