A9 Paper Size Guide.

A9 paper size in inches, cm, mm.

The A9 paper size is 3.7 cm x 5.2 cm, 37 mm x 52 mm and 1.5 in x 2.0 in. Its printing area is 12.53 cm², 0.002 m² or 4.92 in². As you can see below it is one of the smallest paper sizes in the ‘A’ range, with just A10 being smaller.

If you want to design and print a label or sticker using the A9 paper size, knowing about the A9 pixel format is important. In graphic design and reprography, resolution is essential. Resolutions for A9 paper size are: 

• 300 dpi represents 437 x 614 pixels/inches

• 200 dpi represents 291 x 409 pixels/inches

• A low resolution 72 dpi represents 105 x 147 pixels/inches

In addition, the A9 paper size - as with all formats in the A range - maintains its proportions between width and length. The width of the A9 format is equal to the length of the A10 format and the length of the A9 format is equal to the width of the A8 format.

It was in 1786 that the German scientist Lichtenberg described the proportion between width and length of the A formats. Then, in 1922, Porstmann and the German Institute for Standardisation defined the DIN 476 standard which developed into the current standard, known as ISO 216.

• A9 = ¼ of A7

• A9 = ½ of A8

• A9 = 2 x A10

The A9 paper size is one of the smallest printable formats in the A series and, despite its small size, can be a great asset in a communications strategy.

Printing with A9 paper size.

If you need to print A9 size labels or stickers, it’s important to prepare your file in prepress to ensure that it has a resolution of 37 x 52 mm at 300 ppi (pixels per inch). In addition, you should make sure to leave a 3 mm bleed margin that allows you to get the rendering right.

Creating impactful designs on a small A9 format.

The A9 paper size has low production costs are quite low compared to larger print sizes, meaning you get more for your money. For example, it can be used for coupons that will be distributed to your customers or to design labels in line with your branding.

Even on a small format, the possibilities are endless. A layout and DTP software like InDesign is ideal for designing graphic elements that match your visual identity. The A9 paper dimensions may not allow you to include a lot of information on a label, a coupon or a sticker. However, with a well thought out design, these elements can play a crucial role in your communication strategy and help build brand awareness.

Frequently asked questions.

How big is an A9 piece of paper?

An A9 piece of paper is 3.7 cm x 5.2 cm - half the size of an A8 piece of paper and twice the size of an A10. The aspect ratio √2 applies to A paper sizes, so length = width x √2 for all sizes in the A series. 

What is A9 paper size used for?

Due to its small size, A9 paper is used for things like small stickers and labels and promotional materials like coupons. It’s a useful size because it fits easily into a wallet, pocket or envelope.

Learn more about paper sizes and graphic design.

• Paper sizes
• A10 format
• A0 format
• A1 format