Reference library

B1 Paper Size

B1 measures 707 x 1000 mm, 70.7 x 100 cm, or 27.83 x 39.37 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

B1 is 707 x 1000 mm, 70.7 x 100 cm, or 27.83 x 39.37 in. At 300 DPI, B1 is 8350 x 11811 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

B1 is 707 x 1000 mm, 70.7 x 100 cm, or 27.83 x 39.37 in. At 300 DPI, B1 is 8350 x 11811 px.

707 x 1000 mm

Dimensions and specs

Millimeters	707 x 1000 mm
Centimeters	70.7 x 100 cm
Inches	27.83 x 39.37 in
300 DPI pixels	8350 x 11811 px
Aspect ratio	1:1.4144
Standard family	ISO B Series

Pixels

Pixel dimensions by DPI

DPI / PPI	Width	Height	Use
72 DPI	2004 px	2835 px	Screen or draft reference density
96 DPI	2672 px	3780 px	Screen or draft reference density
150 DPI	4175 px	5906 px	Screen or draft reference density
300 DPI	8350 px	11811 px	Common high-quality print setup
600 DPI	16701 px	23622 px	High-resolution archival or print workflow

Formula

How to calculate this size

Pixel formulapixels = millimeters / 25.4 x PPI

707 mm x 300 PPI = 8,350 px wide.

Trim result8,350 x 11,811 px

Use this when the artwork stops at the finished edge.

Bleed result8,421 x 11,882 px

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

Common mistakes

Avoid these b1 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 B1 Paper Size

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

compare tool B1 vs B0

B1 Paper Size: 707 x 1000 mm
B0: 1000 x 1414 mm

50% smaller than B0 Paper Size. nearly identical aspect ratio compare tool B1 vs B2

B1 Paper Size: 707 x 1000 mm
B2: 500 x 707 mm

100% larger than B2 Paper Size. nearly identical aspect ratio compare tool B1 vs A4

B1 Paper Size: 707 x 1000 mm
A4: 210 x 297 mm

1033.6% larger than A4 Paper Size in Pixels, Millimeters, Centimeters and Inches. nearly identical aspect ratio compare tool B1 vs US Letter

B1 Paper Size: 707 x 1000 mm
US Letter: 215.9 x 279.4 mm

1072% larger than US Letter Paper Size. 0.0657 decimal ratio difference

B1 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 B1 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 B0 paper size same series B2 paper size common alternative A4 paper size common alternative US Letter paper size comparison B1 vs B0 comparison B1 vs B2 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 B1 size?

B1 measures 707 x 1000 mm, 70.7 x 100 cm, or approximately 27.83 x 39.37 in.

What is B1 in pixels at 300 DPI?

B1 at 300 DPI is 8350 x 11811 px when rounded to the nearest whole pixel.

What aspect ratio is B1?

B1 has an aspect ratio of about 1:1.4144 based on its 707 x 1000 mm physical dimensions.

Should I add bleed to a B1 design?

For print work, a common starting point is 3 mm bleed on each side, making the document 713 x 1006 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