Reference library
C0 Envelope Paper Size
C0 measures 917 x 1297 mm, 91.7 x 129.7 cm, or 36.1 x 51.06 in. See pixel dimensions by DPI, aspect ratio, bleed setup, comparisons, and related tools.
Last checked: 2026-05-01
How we calculate this
Methodology and source handling
We convert physical sizes to inches, multiply by the selected DPI/PPI value, and round to whole pixels.
Quick answer
Copy-ready answer
C0 is 917 x 1297 mm, 91.7 x 129.7 cm, or 36.1 x 51.06 in. At 300 DPI, C0 is 10831 x 15319 px.
Dimensions and specs
| Millimeters | 917 x 1297 mm | |
|---|---|---|
| Centimeters | 91.7 x 129.7 cm | |
| Inches | 36.1 x 51.06 in | |
| 300 DPI pixels | 10831 x 15319 px | |
| Aspect ratio | 1:1.4144 | |
| Standard family | ISO C Envelope Series |
Pixels
Pixel dimensions by DPI
| DPI / PPI | Width | Height | Use |
|---|---|---|---|
| 72 DPI | 2599 px | 3677 px | Screen or draft reference density |
| 96 DPI | 3466 px | 4902 px | Screen or draft reference density |
| 150 DPI | 5415 px | 7659 px | Screen or draft reference density |
| 300 DPI | 10831 px | 15319 px | Common high-quality print setup |
| 600 DPI | 21661 px | 30638 px | High-resolution archival or print workflow |
Formula
How to calculate this size
917 mm x 300 PPI = 10,831 px wide.
Use this when the artwork stops at the finished edge.
Add 0 mm per side before calculating pixels when artwork reaches the edge.
Common mistakes
Avoid these c0 envelope paper size problems
A paper size needs a PPI target before pixels mean anything for print.
Portrait and landscape use the same dimensions, but width and height swap in the export.
Paper pages show trim size first; add bleed only when the design prints to the edge.
Calculator
Calculate pixels and bleed
Enter any DPI to calculate the pixel dimensions for this physical size.
Compare
Compare C0 Envelope Paper Size
Open a curated comparison or send both sizes into the compare tool with a fragment URL.
- C0 Envelope Paper Size
- 917 x 1297 mm
- C1
- 648 x 917 mm
- C0 Envelope Paper Size
- 917 x 1297 mm
- A4
- 210 x 297 mm
- C0 Envelope Paper Size
- 917 x 1297 mm
- US Letter
- 215.9 x 279.4 mm
Workflow
Use C0 Envelope Paper Size in a finished file
Copy the millimeter, centimeter, or inch dimensions for the selected paper standard.
Use 300 PPI for most sharp print exports, or match the printer requirement.
Multiply inches by PPI, then add bleed only when artwork reaches the trimmed edge.
Related
Related pages and tools
Same branch
Nearby pages
FAQ
Common questions
What is the exact C0 size?
C0 measures 917 x 1297 mm, 91.7 x 129.7 cm, or approximately 36.1 x 51.06 in.
What is C0 in pixels at 300 DPI?
C0 at 300 DPI is 10831 x 15319 px when rounded to the nearest whole pixel.
What aspect ratio is C0?
C0 has an aspect ratio of about 1:1.4144 based on its 917 x 1297 mm physical dimensions.
Should I add bleed to a C0 design?
Envelope print workflows vary by provider and production method. Confirm bleed, flap, and safe-area requirements with the printer or envelope template before output.
References
Sources and references
ISO 269 physical dimensions. Pixel values are calculated from millimeters / 25.4 x DPI and rounded to whole pixels.
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ISO 269:1985
Used for ISO C envelope dimensions and DL envelope references.
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HP paper size reference
Used as a reputable printer reference for North American office, ANSI, and envelope dimensions.
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W3C CSS Values and Units Module
Used for CSS unit definitions, absolute unit relationships, and CSS px behavior.
Last checked: 2026-05-01