A woman removing a ream of paper from packaging

Printer paper sizes

Printing is something we may be guilty of taking for granted from time to time. But now and then we’ll need to print something very specific, that isn’t your standard A4, one-pager Word doc.

This usually involves using different sized paper, which always brings up questions such as ‘is A3 bigger than A4?’.

With paper sizes operating on a reverse scale, with the largest dimensions being the smallest number, you can see why this could get confusing.

To help you out with these on-going questions, we’ll run through some common paper sizes, what they look like, and how they’re used.

How many different sizes are there?

Paper not only comes in different sizes but classes as well. Below outlines the A-class, which is the one most of us use day-to-day. A-class paper is defined as paper with the correct ratios, meaning it can be folded in half perfectly to create the next smallest size.

Diagram of A-class paper sizes in a grid to illustrate that when each size is folded in half, it creates the next smallest size

Read on to discover the sizes and uses for these paper sizes, and their compatible printers.


Despite having the lowest number, this is the largest of them all, with A0 paper size being 841 x 1189 mm. In other words, they’re over a metre in height, which is the same as 16 pieces of A4 paper. Typically, these would be used for making large signs and posters.


Similar to A0 paper, these sheets of paper would be used for creating signs, window displays and posters. However, they aren’t as big as A0, with A1 paper size coming in at 594 x 841 mm.


Scaling down from the above, A2 paper size is 420 x 594 mm. The kinds of things this size of paper would be used for are notices, posters, art prints and window displays. It’s slightly larger overall than a British broadsheet newspaper.


A form of paper you’ll have encountered at work or school, A3 paper size stands at 297 x 420 mm, a similar size but slightly different in proportions to a tabloid newspaper. One of the more popular paper sizes around, this tends to be for posters, plans, charts and presentations. While not a go-to paper size for home use, many business smart inkjet printers offer A3 print capability, with some even offering this from an A4 size machine!


The most common and recognised sheet of paper, A4 paper size is 210 x 297 mm. Used throughout the UK, this is used for everyday printing for everything from Word documents to stationery letterheads. These are the universal home printing format, and all laser and inkjet printers – along with some mobile printers – should have A4 capability.


Another set of dimensions you’ll be used to seeing, A5 paper size is 148.5 x 210 mm, and has many common uses. From flyers and invitations, to booklets, planners and diaries, it makes for a handy and portable size. While several mobile printers offer A5 printing facilities, many standard home printers offer A5 prints, as it is half the size of A4, allowing two A5 prints to be printed on one sheet of A4.


Standard A6 paper size is 105 x 148.5 mm, which makes it too small for long blocks of text, but it still has plenty of uses. Some mobile printers offer the capability to print this size, which is most regularly used for flyers, postcards, leaflets and save the dates.

Paper size chart

While we’ve talked you through A0 to A6, the A-Class actually runs all the way to a tiny A10 size. Below, you’ll find a paper size chart detailing all the sizes in the A-class, including the ones not mentioned above, in cm, mm and inches.

 Paper  mm  cm  inches
 A0  841 x 1189 mm  84.1 x 118.9 cm  33.1 x 46.8 inches
 A1  594 x 841 mm  59.4 x 84.1 cm  23.4 x 33.1 inches
 A2  420 x 594 mm  42 x 59.4 cm  16.5 x 23.4 inches
 A3  297 x 420 mm  29.7 x 42 cm  11.7 x 16.5 inches
 A4  210 x 297 mm  21 x 29.7 cm  8.3 x 11.7 inches
 A5  148.5 x 210 mm  14.85 x 21cm  5.8 x 8.3 inches
 A6  105 x 148.5 mm  10.5 x 14.85 cm  4.1 x 5.8 inches
 A7  74 x 105 mm  7.4 x 10.5 cm  2.9 x 4.1 inches
 A8  52 x 74 mm  5.2 x 7.4 cm  2.0 x 2.9 inches
 A9  37 x 52 mm  3.7 x 5.2 cm  1.5 x 2.0 inches
 A10  26 x 37 mm  2.6 x 3.7 cm  1.0 x 1.5 inches


As you can see, there’s more to paper sizing than you might have thought – and this is just one class of many! But for common and convenient sizes like A3, A4 and A5, you can rely on a Brother printer to deliver high-quality and reliable printing page after page.

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