Reference library
No. 10 Envelope Size
No. 10 measures 104.775 x 241.3 mm, 10.478 x 24.13 cm, or 4.13 x 9.5 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
No. 10 is 104.775 x 241.3 mm, 10.478 x 24.13 cm, or 4.13 x 9.5 in. At 300 DPI, No. 10 is 1238 x 2850 px.
Dimensions and specs
| Millimeters | 104.775 x 241.3 mm | |
|---|---|---|
| Centimeters | 10.478 x 24.13 cm | |
| Inches | 4.13 x 9.5 in | |
| 300 DPI pixels | 1238 x 2850 px | |
| Aspect ratio | 1:2.303 | |
| Standard family | Envelope |
Pixels
Pixel dimensions by DPI
| DPI / PPI | Width | Height | Use |
|---|---|---|---|
| 72 DPI | 297 px | 684 px | Screen or draft reference density |
| 96 DPI | 396 px | 912 px | Screen or draft reference density |
| 150 DPI | 619 px | 1425 px | Screen or draft reference density |
| 300 DPI | 1238 px | 2850 px | Common high-quality print setup |
| 600 DPI | 2475 px | 5700 px | High-resolution archival or print workflow |
Formula
How to calculate this size
104.78 mm x 300 PPI = 1,238 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 no. 10 envelope 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 No. 10 Envelope Size
Open a curated comparison or send both sizes into the compare tool with a fragment URL.
- No. 10 Envelope Size
- 104.775 x 241.3 mm
- Monarch
- 98.4 x 190.5 mm
- No. 10 Envelope Size
- 104.775 x 241.3 mm
- A4
- 210 x 297 mm
- No. 10 Envelope Size
- 104.775 x 241.3 mm
- US Letter
- 215.9 x 279.4 mm
Workflow
Use No. 10 Envelope 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 No. 10 size?
No. 10 measures 104.775 x 241.3 mm, 10.478 x 24.13 cm, or approximately 4.13 x 9.5 in.
What is No. 10 in pixels at 300 DPI?
No. 10 at 300 DPI is 1238 x 2850 px when rounded to the nearest whole pixel.
What aspect ratio is No. 10?
No. 10 has an aspect ratio of about 1:2.303 based on its 104.775 x 241.3 mm physical dimensions.
Should I add bleed to a No. 10 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
Common envelope sizes physical dimensions. Pixel values are calculated from millimeters / 25.4 x DPI and rounded to whole pixels.
-
ISO 269:1985
Used for ISO C envelope dimensions and DL envelope references.
-
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