Reference library

A9 Paper Size

A9 measures 37 x 52 mm, 3.7 x 5.2 cm, or 1.46 x 2.05 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

A9 is 37 x 52 mm, 3.7 x 5.2 cm, or 1.46 x 2.05 in. At 300 DPI, A9 is 437 x 614 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

A9 is 37 x 52 mm, 3.7 x 5.2 cm, or 1.46 x 2.05 in. At 300 DPI, A9 is 437 x 614 px.

37 x 52 mm

Dimensions and specs

Millimeters	37 x 52 mm
Centimeters	3.7 x 5.2 cm
Inches	1.46 x 2.05 in
300 DPI pixels	437 x 614 px
Aspect ratio	1:1.4054
Standard family	ISO A Series

Pixels

Pixel dimensions by DPI

DPI / PPI	Width	Height	Use
72 DPI	105 px	147 px	Screen or draft reference density
96 DPI	140 px	197 px	Screen or draft reference density
150 DPI	219 px	307 px	Screen or draft reference density
300 DPI	437 px	614 px	Common high-quality print setup
600 DPI	874 px	1228 px	High-resolution archival or print workflow

Formula

How to calculate this size

Pixel formulapixels = millimeters / 25.4 x PPI

37 mm x 300 PPI = 437 px wide.

Trim result437 x 614 px

Use this when the artwork stops at the finished edge.

Bleed result508 x 685 px

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

Common mistakes

Avoid these a9 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 A9 Paper Size

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

compare tool A9 vs A8

A9 Paper Size: 37 x 52 mm
A8: 52 x 74 mm

50% smaller than A8 Paper Size. 0.0088 decimal ratio difference compare tool A9 vs A10

A9 Paper Size: 37 x 52 mm
A10: 26 x 37 mm

100% larger than A10 Paper Size. 0.0088 decimal ratio difference compare tool A9 vs A4

A9 Paper Size: 37 x 52 mm
A4: 210 x 297 mm

96.9% smaller than A4 Paper Size in Pixels, Millimeters, Centimeters and Inches. 0.0045 decimal ratio difference

A9 belongs to the ISO A 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 A9 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 A8 paper size same series A10 paper size common alternative A4 paper size common alternative US Letter paper size comparison A9 vs A8 comparison A9 vs A10 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 A9 size?

A9 measures 37 x 52 mm, 3.7 x 5.2 cm, or approximately 1.46 x 2.05 in.

What is A9 in pixels at 300 DPI?

A9 at 300 DPI is 437 x 614 px when rounded to the nearest whole pixel.

What aspect ratio is A9?

A9 has an aspect ratio of about 1:1.4054 based on its 37 x 52 mm physical dimensions.

Should I add bleed to a A9 design?

For print work, a common starting point is 3 mm bleed on each side, making the document 43 x 58 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