Reference library

B3 Paper Size

B3 measures 353 x 500 mm, 35.3 x 50 cm, or 13.9 x 19.69 in. See pixel dimensions by DPI, aspect ratio, bleed setup, comparisons, and related tools.

Last checked: 2026-05-01

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At a glance

B3 is 353 x 500 mm, 35.3 x 50 cm, or 13.9 x 19.69 in. At 300 DPI, B3 is 4169 x 5906 px.

Last checked: 2026-05-01 Source: ISO 216:2007 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

B3 is 353 x 500 mm, 35.3 x 50 cm, or 13.9 x 19.69 in. At 300 DPI, B3 is 4169 x 5906 px.

353 x 500 mm

Dimensions and specs

Millimeters	353 x 500 mm
Centimeters	35.3 x 50 cm
Inches	13.9 x 19.69 in
300 DPI pixels	4169 x 5906 px
Aspect ratio	1:1.4164
Standard family	ISO B Series

Pixels

Pixel dimensions by DPI

DPI / PPI	Width	Height	Use
72 DPI	1001 px	1417 px	Screen or draft reference density
96 DPI	1334 px	1890 px	Screen or draft reference density
150 DPI	2085 px	2953 px	Screen or draft reference density
300 DPI	4169 px	5906 px	Common high-quality print setup
600 DPI	8339 px	11811 px	High-resolution archival or print workflow

Formula

How to calculate this size

Pixel formulapixels = millimeters / 25.4 x PPI

353 mm x 300 PPI = 4,169 px wide.

Trim result4,169 x 5,906 px

Use this when the artwork stops at the finished edge.

Bleed result4,240 x 5,976 px

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

Common mistakes

Avoid these b3 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 B3 Paper Size

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

compare tool B3 vs B2

B3 Paper Size: 353 x 500 mm
B2: 500 x 707 mm

50.1% smaller than B2 Paper Size. 0.0012 decimal ratio difference compare tool B3 vs B4

B3 Paper Size: 353 x 500 mm
B4: 250 x 353 mm

100% larger than B4 Paper Size. 0.0022 decimal ratio difference compare tool B3 vs A4

B3 Paper Size: 353 x 500 mm
A4: 210 x 297 mm

183% larger than A4 Paper Size in Pixels, Millimeters, Centimeters and Inches. 0.0011 decimal ratio difference compare tool B3 vs US Letter

B3 Paper Size: 353 x 500 mm
US Letter: 215.9 x 279.4 mm

192.6% larger than US Letter Paper Size. 0.0667 decimal ratio difference

B3 belongs to the ISO B Series 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 B3 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 pages and tools

same series B2 paper size same series B4 paper size common alternative A4 paper size common alternative US Letter paper size comparison B3 vs B2 comparison B3 vs B4 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 B3 size?

B3 measures 353 x 500 mm, 35.3 x 50 cm, or approximately 13.9 x 19.69 in.

What is B3 in pixels at 300 DPI?

B3 at 300 DPI is 4169 x 5906 px when rounded to the nearest whole pixel.

What aspect ratio is B3?

B3 has an aspect ratio of about 1:1.4164 based on its 353 x 500 mm physical dimensions.

Should I add bleed to a B3 design?

For print work, a common starting point is 3 mm bleed on each side, making the document 359 x 506 mm before trimming. Confirm final bleed with your printer.

References

Sources and references

ISO 216 physical dimensions. Pixel values are calculated from millimeters / 25.4 x DPI and rounded to whole pixels.

ISO 216:2007
Used for ISO A and B series physical paper dimensions.
W3C CSS Values and Units Module
Used for CSS unit definitions, absolute unit relationships, and CSS px behavior.

Last checked: 2026-05-01