The Dimensions of A3 Printer Paper and its Uses

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Updated November 14, 2022

There are wide arrays of different top-performing printer paper sizes, so choosing the right one can be frustrating for some consumers. It’s especially frustrating if you don’t have the right size of paper or are confused by the range of paper sizes. In that case, we are here to help. Also, check out how to choose the best paper for a laser printer.


  • A3 printer paper is 11.7 x 16.5 inches or 297 x 420 millimeters as defined by the ISO 216 standards.
  • This paper size is rather large and may not fit all printers, so research ahead of time.
  • A3 paper is a great choice for printing out drawings, diagrams, charts, graphs, and related tables.

A Series Paper

A3 printer paper is one of the more popular sizes you are likely to encounter, though it can be helpful to understand exactly what designations A3 paper and all A Series paper are.

A Series of paper sizes have been defined by the ISO 216 standard and must feature the following requirements.

  • The length divided by the width is 1.4142.
  • The A0 size has an area of 1 square meter.
  • Each subsequent size A(n) is defined as A(n-1) cut in half parallel to its shorter sides.
  • Each size’s standard length and width are rounded to the nearest millimeter.

A3 paper can come in different thicknesses but tend to offer the same dimensions across the whole subcategory. A3 paper is 11.7 x 16.5 inches or 297 x 420 millimeters. Unless you know what port should your wireless printer be on, printing will be a nightmare for you as there will be no communication between the printer and your other gadgets. And if your printer is wireless, be sure to know what the WPS Pin on your printer is for when you are configuring your printer.

The Uses of A3 Printer Paper

You will likely run into A3 printer paper while performing a number of basic office and school-related tasks. It is one of the larger sizes of paper, but you can always check what size is A5 print if you need a smaller size. Here are just a few of the best uses of A3 paper.

Drawings and Diagrams

Due to the large size of A3 printer paper, it can often be used when reproducing drawings and diagrams. This makes A3 paper especially useful in various industries that require frequent diagrams, such as engineering, science, and related professions. As a warning, you will want to check your printer’s specifications before buying some A3 paper, as this size may not fit all printers out there. Do your research ahead of time and save yourself some headaches.


As a warning, you will want to check the specifications of your printer before buying some A3 paper as this size may not fit all printers out there.

Large Tables, Charts, and Graphs

A3 printer paper has proven particularly useful in creating large tables, charts, and graphics. Just as with diagrams and drawings, this is due to A3 paper’s relatively large size. A3 paper is a favorite size of statisticians everywhere.

Two A4 Pages as a Spread

One of the most unique aspects of A3 printer paper is that it can easily be used to print out two A4 pages as a spread. This can be useful in a number of professional or creative scenarios.


What’s the difference between an A3 and an A4 printer, copier, or MFP?

This designates the paper size that the printer or copier will excel with. As a warning, not all A4 printers or copiers will integrate with A3 paper and vice versa.

How many different sizes are there?

When it comes to paper sizes, the sky is the limit. There are dozens and dozens of different printer paper sizes to choose from, though not every size will work with every printer.

How do the paper sizes relate to one another?

There is the A Series, the B Series, and a whole lot of paper sizes that belong to no individual series. Different parts of the world tend to use different paper sizes when it comes to professional settings.

STAT: A3s are more likely to be able to print legal-sized documents and materials for making booklets, pamphlets, and such. (source)

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