A5 Paper Size, Dimensions and Format (A series)


148 x 210




Aspect ratio 1:1.42
Perimeter (P) 716 mm
Diagonal (d) 256.91 mm
Area (A) 31,080 mm²


The A5 format measures 148 x 210 mm or 5.8 x 8.3 inches. An A5 paper fromat has an aspect ratio of 1:1.42. The Area of the A5 paper size is 31,080 mm² or 48.14 in² with a perimeter of 716 mm or 28.20 in. An A5 format has a diagonal length of 256.91 mm or 10.13 in. The A5 size belongs to the A series. In the A series there are a total of 19 paper sizes.

What size is the A5 Paper?

A5 paper is 148 mm x 210 mm in size. In terms of its diagonal measurement, an A5 sheet measures 256.91 mm (10.13 inches) in length. You'll find A5s in the A series of paper sizes. The A-series includes 19 unique paper sizes. 1:1.42 is the aspect ratio of an A5 sheet of paper. The perimeter of an A5 sheet of paper is 716 millimeters (28.20 inches), and its area is 31,080 millimeters squared (inches squared).

Maybe those measurements don't paint a clear picture of some frequently asked questions in a user's mind. For example you may want to know is A4 or A5 bigger or what is the difference between A5 and A6?

A4 is two times bigger than A5, this makes A5 paper format equal to a half of an A4 paper. On the other hand, if you cut an A5 paper in half it will create two A6 sheets of paper. That is how ISO standard works, so yeah A4 is bigger than A5 (2 times bigger to be precise), A5 is bigger than A6 and so it goes.

Maybe you have been asking yourselves what is the right envelope for such paper size. Well, a paper of an A5 size will fit into a C5 envelope. However, if you fold it in half, it will fit into a C6 envelope size.

A5 is part of the A series and is defined by the ISO 216 international paper size standard.

If you are interested in its B series sisters click here.

A5 paper in other units:

  • 14.8 x 21 cm
  • 0.1 x 0.2 m
  • 420 x 595 pt
  • 35 x 49.6 pc
  • 1748 x 2480 px


What is A5 Paper used for?

The versatility of A5 paper is one of the main factors contributing to its widespread adoption. Although legal size paper is not the norm in the United States, A5 is widely available for use in formal environments in several other countries.

However, if you regularly work with international clients, it may be advantageous to become familiar with A5 printer paper. Flyers, pamphlets, and other simple promotional materials benefit greatly when printed on A5 paper.

Promotional mailers, which have grown in popularity in recent years, can also fall under this category. Flyers for concerts and art shows are popular items for young artists to promote on A5 printer paper. Cards, office supplies, and other small-format documents are common uses for A5 paper. This is because A5 paper is a special and compact size. Many arts and crafts use A5 paper. See our explanation of printer paper size for more information on paper types.

You may think A5 is rather small, even though it is true there is a lot that this paper size can do for you and your business. It is widely used for booklets, flyer printing, brochures and even daily planners, notepads and pocket books. You probably use it everyday in your school or work life as A5 is a normal notebook size.

It has the perfect measurements to fit eye-catching designs and it can convey any crucial information that you want to reach your audience. The A5 paper stock can be used as a commercial flyer or placed flawlessly into an envelope for mail-out campaigns.

What makes this paper format great especially for commercial booklets is that given its dimensions it can fit very easily into a reader's hands or and it can deliver a perfect advertisement for your business around the clock.


Is the A5 Paper Size bigger than the A4 paper?

The dimensions of an A5 sheet of paper are more compact than those of an A4 sheet. This is because the length and width of an A5 size sheet are smaller than those of an A4 sheet of paper, and those few extra inches make all the difference in the world.


Is A5 Paper Size the same as 8.5 x 11?

The short answer is no. 8.5 x 11 has a self explanatory size of 8.5 x 11 in, whereas A5 has a size in inches of 5.8 x 8.3. However 8.5 x 11 which is one of the most commonly used paper formats in the US is just slightly smaller than A4, which compared to 8.5 x 11 is 8.27 x 11.69 in. If you want a put a name on the 8.5 x 11 inch size paper, those are: Letter, P4 Paper, Ansi A (Letter), and Carta.

Frequently Asked Questions

The size of an A5 paper is 148 x 210 mm

The size of an A5 paper in inches is 5.8 x 8.3 in

The half size of an A5 paper is 74 x 105 mm or 2.9 x 4.15 in

The aspect ratio of an A5 is 1:1.42

The area of an A5 paper is 31,080 mm or 48.14 in

The perimeter of an A5 paper is 716 mm or 28.20 in

The diagonal measurement of A5 paper is 256.91 mm or 10.13 in

Other A Paper Sizes →

There are a total of 19 A Paper Sizes.