Paper Sizes Explained
Choosing the right paper size is an important part of planning any print project. The size you choose can affect everything from design and postage costs to how your printed materials are used.
The good news is that most business printing uses just a handful of standard paper sizes, and once you know the basics they’re easy to recognise.
What are standard paper sizes?
Most printed materials use internationally recognised paper sizes, making it easy to design, print and handle documents consistently.
The most common sizes belong to the A Series, although DL is also widely used for envelopes and flyers.
The most common paper sizes
| Paper Size | Size Relationship | Common Uses |
|---|---|---|
| A3 | Twice the size of A4 | Posters, presentations and folded brochures. |
| A4 | Standard document size | Letters, brochures, forms and reports. |
| A5 | Half the size of A4 | Leaflets, booklets, menus and promotional literature. |
| A6 | Half the size of A5 | Postcards, invitations and small promotional leaflets. |
| DL | One-third of an A4 sheet (when folded) | Compliment slips, folded letters and flyers for DL envelopes. |
If you’re unsure which size is right for your project, think about how it will be used. A letter is usually A4, a leaflet is often A5, while postcards and promotional cards are commonly A6.
Which paper size should I choose?
The right paper size depends on what you’re producing.
For example:
- A4 is ideal for letters and everyday business documents
- A5 is popular for leaflets and event information
- A6 works well for postcards and smaller promotions
- DL is often chosen for mailings because it fits standard DL envelopes
- A3 provides extra space for posters or larger designs
If you’re planning a mailing, it’s also worth remembering that the size of your printed item can affect postage options and mailing costs.
Summary
Choosing the right paper size helps ensure your printed materials are practical, cost-effective and fit their intended purpose. Most business printing uses a handful of standard sizes, making it easy to select the best option for your project.