Reference library
Arch A Paper Size
Arch A measures 228.6 x 304.8 mm, 22.86 x 30.48 cm, or 9 x 12 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
Arch A is 228.6 x 304.8 mm, 22.86 x 30.48 cm, or 9 x 12 in. At 300 DPI, Arch A is 2700 x 3600 px.
Dimensions and specs
| Millimeters | 228.6 x 304.8 mm | |
|---|---|---|
| Centimeters | 22.86 x 30.48 cm | |
| Inches | 9 x 12 in | |
| 300 DPI pixels | 2700 x 3600 px | |
| Aspect ratio | 1:1.3333 | |
| Standard family | Architectural |
Pixels
Pixel dimensions by DPI
| DPI / PPI | Width | Height | Use |
|---|---|---|---|
| 72 DPI | 648 px | 864 px | Screen or draft reference density |
| 96 DPI | 864 px | 1152 px | Screen or draft reference density |
| 150 DPI | 1350 px | 1800 px | Screen or draft reference density |
| 300 DPI | 2700 px | 3600 px | Common high-quality print setup |
| 600 DPI | 5400 px | 7200 px | High-resolution archival or print workflow |
Formula
How to calculate this size
228.6 mm x 300 PPI = 2,700 px wide.
Use this when the artwork stops at the finished edge.
Add 3 mm per side before calculating pixels when artwork reaches the edge.
Common mistakes
Avoid these arch a 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 Arch A Paper Size
Open a curated comparison or send both sizes into the compare tool with a fragment URL.
- Arch A Paper Size
- 228.6 x 304.8 mm
- Arch B
- 304.8 x 457.2 mm
- Arch A Paper Size
- 228.6 x 304.8 mm
- A4
- 210 x 297 mm
- Arch A Paper Size
- 228.6 x 304.8 mm
- US Letter
- 215.9 x 279.4 mm
Workflow
Use Arch A 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 Arch A size?
Arch A measures 228.6 x 304.8 mm, 22.86 x 30.48 cm, or approximately 9 x 12 in.
What is Arch A in pixels at 300 DPI?
Arch A at 300 DPI is 2700 x 3600 px when rounded to the nearest whole pixel.
What aspect ratio is Arch A?
Arch A has an aspect ratio of about 1:1.3333 based on its 228.6 x 304.8 mm physical dimensions.
Should I add bleed to a Arch A design?
For print work, a common starting point is 3 mm bleed on each side, making the document 234.6 x 310.8 mm before trimming. Confirm final bleed with your printer.
References
Sources and references
North American architectural drawing sizes physical dimensions. Pixel values are calculated from millimeters / 25.4 x DPI and rounded to whole pixels.
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ASME Y14.1 drawing sheet size and format
Used for ANSI and architectural drawing sheet size families.
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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