A-Series Paper Sizes Guide

Understanding paper sizes for your print projects is simpler than you might think! The most common system is the A-series, defined by the ISO 216 international standard and widely adopted worldwide.

The idea is straightforward: each size is either a fold or an expansion of the next. For example, fold an A0 sheet in half and you get an A1. Fold an A1 and you’ll have an A2, and so on. Every sheet in the series keeps the same proportions because they all share a consistent aspect ratio based on the square root of two. This clever ratio ensures that folding the shorter side of a larger sheet always produces the next smaller size, with matching proportions.

Within this system, there are even larger formats than A0, such as 2A0 and 4A0, along with other series of standard sizes. Of them all, A4 is the most widely used – the go-to choice for everyday documents and general printing needs. Choosing the right size depends on your project, but A4 remains the most practical and familiar option.

If you want a quick visual guide, grab a sheet of A4 from your printer. Place two side by side to see the size of an A3, or fold one in half to make an A5. It’s simply a system of doubling or halving, making it easy to understand and apply. And if you’re still unsure which paper size best suits your project, contact your nearest Kwik Kopy centre so our friendly team can guide you.

Selecting the right paper size isn’t just about fitting words and images on a page; it’s about making sure your message works for the setting and the audience. If you want to grab attention from a distance, larger formats like A1 or A2 are the way to go. They’re perfect for posters, event signage, or technical plans where visibility and detail really matter. Just keep in mind that the bigger the sheet, the higher the printing cost, so it’s worth matching the size to the impact you need.

For everyday business communication, A4 is the most effective and budget-friendly choice. It’s the standard size for reports, brochures, and stationery, making it simple to print, distribute, and file. If you’re creating notepads or invitations, A5 offers a neat, compact option that still feels polished. For quick, high-volume promotions, smaller sizes like A6 or A7 are ideal for flyers, postcards, or business cards.

The smartest approach is to start with your purpose:

• Do you need maximum visibility? Choose a larger format.
• Do you need professional, everyday use? Stick with A4.
• Do you need handy, portable materials? A5 and smaller sizes work best.

By matching the paper size to the job, you’ll ensure your materials look professional, are easy to use, and deliver the right impact without unnecessary costs.

Ready to get started? Request a quote or explore our printing services for more info.

Need something bigger? See our large format printing solutions.