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PixelMeasures

Reference library

Arch B Paper Size

Arch B measures 304.8 x 457.2 mm, 30.48 x 45.72 cm, or 12 x 18 in. See pixel dimensions by DPI, aspect ratio, bleed setup, comparisons, and related tools.

Last checked: 2026-05-01

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Last checked: 2026-05-01 Source: ASME Y14.1 drawing sheet size and format Found a spec change? Send correction.

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.

Methodology Editorial policy

Quick answer

Copy-ready answer

Arch B is 304.8 x 457.2 mm, 30.48 x 45.72 cm, or 12 x 18 in. At 300 DPI, Arch B is 3600 x 5400 px.

304.8 x 457.2 mm

Dimensions and specs

Millimeters 304.8 x 457.2 mm
Centimeters 30.48 x 45.72 cm
Inches 12 x 18 in
300 DPI pixels 3600 x 5400 px
Aspect ratio 1:1.5
Standard family Architectural

Pixels

Pixel dimensions by DPI

DPI / PPIWidthHeightUse
72 DPI 864 px 1296 px Screen or draft reference density
96 DPI 1152 px 1728 px Screen or draft reference density
150 DPI 1800 px 2700 px Screen or draft reference density
300 DPI 3600 px 5400 px Common high-quality print setup
600 DPI 7200 px 10800 px High-resolution archival or print workflow

Formula

How to calculate this size

Pixel formulapixels = millimeters / 25.4 x PPI

304.8 mm x 300 PPI = 3,600 px wide.

Trim result3,600 x 5,400 px

Use this when the artwork stops at the finished edge.

Bleed result3,671 x 5,471 px

Add 3 mm per side before calculating pixels when artwork reaches the edge.

Common mistakes

Avoid these arch b paper size problems

Mixing screen pixels with print quality

A paper size needs a PPI target before pixels mean anything for print.

Forgetting orientation

Portrait and landscape use the same dimensions, but width and height swap in the export.

Adding bleed to a paper reference

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 B Paper Size

Open a curated comparison or send both sizes into the compare tool with a fragment URL.

compare tool Arch B vs Arch A
Arch B Paper Size
304.8 x 457.2 mm
Arch A
228.6 x 304.8 mm
100% larger than Arch A Paper Size. 0.0833 decimal ratio difference compare tool Arch B vs Arch C
Arch B Paper Size
304.8 x 457.2 mm
Arch C
457.2 x 609.6 mm
50% smaller than Arch C Paper Size. 0.0833 decimal ratio difference compare tool Arch B vs A4
Arch B Paper Size
304.8 x 457.2 mm
A4
210 x 297 mm
123.4% larger than A4 Paper Size in Pixels, Millimeters, Centimeters and Inches. 0.0404 decimal ratio difference compare tool Arch B vs US Letter
Arch B Paper Size
304.8 x 457.2 mm
US Letter
215.9 x 279.4 mm
131% larger than US Letter Paper Size. 0.1061 decimal ratio difference
Arch B belongs to the Architectural family. Use this reference for print setup, document layout, template sizing, pixel conversion, and comparisons with nearby paper sizes. Pixel dimensions are calculated from the physical size and selected DPI.

Workflow

Use Arch B Paper Size in a finished file

Confirm the physical size

Copy the millimeter, centimeter, or inch dimensions for the selected paper standard.

Choose PPI

Use 300 PPI for most sharp print exports, or match the printer requirement.

Calculate pixels

Multiply inches by PPI, then add bleed only when artwork reaches the trimmed edge.

Related

Related pages and tools

same series Arch A paper size same series Arch C paper size common alternative A4 paper size common alternative US Letter paper size comparison Arch B vs Arch A comparison Arch B vs Arch C tool DPI calculator tool Print bleed calculator tool Compare sizes tool

Same branch

Nearby pages

A4 Paper Size in Pixels, Millimeters, Centimeters and Inches A5 Paper Size Legal Paper Size US Letter Paper Size A0 Paper Size A1 Paper Size A10 Paper Size A2 Paper Size

FAQ

Common questions

What is the exact Arch B size?

Arch B measures 304.8 x 457.2 mm, 30.48 x 45.72 cm, or approximately 12 x 18 in.

What is Arch B in pixels at 300 DPI?

Arch B at 300 DPI is 3600 x 5400 px when rounded to the nearest whole pixel.

What aspect ratio is Arch B?

Arch B has an aspect ratio of about 1:1.5 based on its 304.8 x 457.2 mm physical dimensions.

Should I add bleed to a Arch B design?

For print work, a common starting point is 3 mm bleed on each side, making the document 310.8 x 463.2 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.

Last checked: 2026-05-01