C1
648 mm
917 mm
What Size Is C1 Paper?
C1, part of the C Series under the C Envelope Paper Sizes group, measures 648 x 917 mm, which is 64.8 x 91.7 cm or approximately 25.51 x 36.1 inches. It follows the ISO 269 specification and has an area of approximately 0.5942 m².
C1 Paper Size Dimensions & Conversions
Paper Series
C Series
Standard
ISO 269
Width
648 mm
Height
917 mm
Area
0.5942 m²
Aspect Ratio
1:1.415
Previous Size
C0
Next Size
C2
C1 Dimensions in Different Units
| Unit | Width | Height |
|---|---|---|
| Millimeters | 648 mm | 917 mm |
| Centimeters | 64.8 cm | 91.7 cm |
| Inches | 25.51 in | 36.1 in |
| Feet | 2.13 ft | 3.01 ft |
| Meters | 0.648 m | 0.917 m |
| Points | 1837 pt | 2599 pt |
| Picas | 153.1 pc | 216.6 pc |
What Is C1 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 C1 when a layout calls for this specific format.
Reproduction and Scaling
C1 can be scaled up or down to produce related sizes in the same series.
Presentations and Displays
C1 is suitable for boards, handouts, or displays sized to this format.
Archiving and Filing
Printed materials in C1 are stored and filed using standard folders sized for this format.
Digital Reference
C1 dimensions are used as a page-size preset in design and publishing software.
Related C Series Sizes
Frequently Asked Questions
What is C1 size in inches?
C1 measures approximately 25.51 x 36.1 inches.
What is C1 size in centimeters?
C1 measures 64.8 x 91.7 cm.
What is C1 size in millimeters?
C1 measures 648 x 917 mm.
What is C1 size in pixels?
At 300 DPI, C1 is approximately 7653 x 10830 pixels.
Is C1 bigger than C2?
Yes. C1 is larger in area than C2 in the C Envelope Paper Sizes series.