A8, A9, A10 Paper Size

Honestly, we don’t have many chances using A8, A9, or A10 paper size in daily work, but as you are here, you might have encountered this question – what exactly do these names mean, and what are the dimensions of them?

Ok, let’s cut to the chase.

A8 A9 A10 Size Chart – in inches, cm, mm

Size Name Width x Height in inches Width x Height in cm Width x Height in mm
A8 Size
2.05 x 2.91″ 5.2 x 7.4 cm 52 x 74 mm
A9 Size
1.46 x 2.05″ 3.7 x 5.2 cm 37 x 52 mm
A10 Size
1.02 x 1.46″ 2.6 x 3.7 cm 26 x 37 mm

A8 A9 A10 Size Chart – in pixels

Size # 72 dpi/ppi
(screen resolution)
96 dpi/ppi
(screen resolution)
150 dpi/ppi
(screen resolution)
300 dpi/ppi
(print resolution)
A8 147 x 210 px 197 x 280 px 307 x 437 px 614 x 874 px
A9 105 x 147 px 140 x 197 px 219 x 307 px 437 x 614 px
A10 74 x 105 px 98 x 140 px 154 x 219 px 307 x 437 px

* PPI (pixels per inch) = DPI (dots per inch) = Resolution

Definition & Regions

They all are parts of the ISO 216 standard A paper sizes, which was defined basing on the German DIN 476 standard from 1922, and as the smallest ones in the whole series.

ISO paper sizes are used in most of the non-American countries in the world, as shown in below picture, in which you can see that there are two different main paper size systems. One of the systems is the ISO standard, and another is US paper size standard, which is applied in US, Canada, Mexico, and some former American colonial areas.

As you can see from the chart below, as the two most accepted in the world, ISO paper sizes and US paper sizes are respectively used in the world indifferent regions.

World Regional Distribution of ISO Paper Sizes and American Paper Sizes
World Regional Distribution of ISO Paper Sizes and American Paper Sizes

Parts of ISO A Series Sizes, and as The Smallest Ones

These sizes are not even shown on most of the ISO A size charts you could find on the internet. Here is the ISO A paper size chart, in which we have added and marked the A8, A9, and A10 size for your reference. But as the A10 is too small to mark, we painted it in dark brown.

A8 A9 A10 in A paper sizes
A8 A9 A10 in A paper sizes

So although the sizes are small, they still follow the basic ratio of ISO paper sizes, 1.414:1, as all the other sizes included in the A series. In order from largest to smallest, A0 is the largest, then A1, A2, A3, A4, A5, A6, A7, and finally A8, A9, A10. They all share the same ratio, which is 1.414:1, or the √2:1

Detailed Information


If take the three smallest out, you will see below layouts. (The layout here has close dimensions as the physical sizes, for your better reference)

A8 A9 A10 Paper Size in inches, cm, mm
A8 A9 A10 Paper Size in inches, cm, mm (Close to physical sizes)

A8 Size – Dimensions & Uses

From the chart you can see that A8 paper size is the relatively bigger among the three, and it has dimensions of 5.2 x 7.4 in cm, or 52 x 74 in mm, and is approximately 2.05 x 2.91 in inches.

Uses: As mentioned, being one of the smallest paper sizes in the A-series, it is commonly used for creating small items like business cards, tickets, or notes. With compact size, A8 paper is convenient to carry and can easily fit into wallets or pockets. It is commonly used in countries like Japan, where small-sized paper is popular.

A9 Size – Dimensions & Uses

A9 paper size is made by folding an A8 size with the same ratio, it measures 3.7 x 5.2 in cm, or 37 x 52 in mm, or around 1.46 x 2.05 in inches, in dimensions.

Uses: It is often used for creating small promotional materials, such as miniature flyers, badges, or stickers. A9 size is also commonly used in Japan for printing transportation passes, such as train tickets or bus cards. Its compactness makes it suitable for portable items.

A10 Size – Dimensions & Uses

A10 paper size, as the smallest one in ISO A paper series sizes, is only half of A9 and measures 2.6 x 3.7 in cm, or 26 x 37 in mm, or approximately 1.02 x 1.46 in inches.

Uses: It is the tiniest paper size in the A-series, and it is often used for creating even small items like labels, stickers, or business card inserts. A10 paper size is commonly found in Japan too, where it is used for small-scale printing needs. Its miniature size allows for intricate designs on small objects.

Advantages – Portable, Cost-saving

These small paper sizes include portability and the ability to create tiny items with ease, and are excellent for situations where space is limited or for creating small memorabilia. They are also suitable for customization or for adding a personal touch to objects.

Disadvantages – Limitations Due to Small Size

But these sizes may not be universally recognized or readily available in all countries, making it challenging to find compatible equipment or standardized templates. The small surface area may also limit the amount of content that can be printed or written.

Equivalents in the US Paper Size

These tiny paper sizes do not have direct or common equivalents in the US paper size system. But they can still be used for specific applications that require small-scale printing, regardless of the lack of direct US equivalents.

Main Facts

A8 Dimensions:
in inches: 2.05 x 2.91″
in mm: 52 x 74 mm
in cm: 5.2 x 7.4 cm

in pixels
72ppi: 147 x 210 px
96ppi: 197 x 280 px
150ppi: 307 x 437 px
300ppi: 614 x 874 px

A9 Dimensions:
in inches: 1.46 x 2.05″
in mm: 37 x 52 mm
in cm: 3.7 x 5.2 cm

in pixels
72ppi: 105 x 147 px
96ppi: 140 x 197 px
150ppi: 219 x 307 px
300ppi: 437 x 614 px

A10 Dimensions:
in inches: 1.02 x 1.46″
in mm: 26 x 37 mm
in cm: 2.6 x 3.7 cm

in pixels
72ppi: 74 x 105 px
96ppi: 98 x 140 px
150ppi: 154 x 219 px
300ppi: 307 x 437 px

Country of use: European and Asian countries, mainly Japan.

Other name: DIN A8, A9, A10 Size

Uses: Used for creating Small items like business cards, tickets, stickers, etc.

Advantages: Portable, and cost-saving.

Disadvantages: Too small to fit for larger printings or detailed contents.

Ratio: Follows the ratio of ISO216 size standard, length to width: 1.414:1, or √2:1