Table of Contents
When it comes to posters, there’s a myriad of dimensions and sizes to choose from depending on your specific needs. That’s why we’ve put together this comprehensive guide – designed to help you understand the most common poster sizes and dimensions in the UK.
What size is a poster?
In the UK, poster sizes are typically measured in millimetres (mm) or centimetres (cm). The A-series paper sizes – from A0 to A5 – are the most common format for posters. Each size halves as you go down the series, keeping the same aspect ratio.
For example:
- A0: 841 x 1189 mm
- A1: 594 x 841 mm
- A2: 420 x 594 mm
- A3: 297 x 420 mm
A5: 148 x 210 mm
These sizes are popular because they’re easy to scale and versatile for various uses.
Your choice of size depends on a few factors:
- Purpose – Is it promotional, decorative, or directional?
- Location – Will it be indoors, outdoors, or in a window?
- Viewing distance – The further away, the larger the poster should be.
Content – Do you have lots of text or mainly visuals?
Standard poster sizes UK
Here’s a quick overview of the most common poster dimensions in the UK and how they’re typically used:
A0 (841 x 1189 mm) – Ideal for big-impact displays and large promotional events.
A1 (594 x 841 mm) – Perfect for shop window displays and event promotions.
A2 (420 x 594 mm) – A popular choice for indoor advertising and art prints.
A3 (297 x 420 mm) – Often used for event announcements or smaller marketing materials.
A5 (148 x 210 mm) – Great for compact promotions and flyers in high-traffic areas.
What are common poster sizes in the UK?
- A1 and A2 are the most popular for business and event promotions.
- A0 is commonly used for large-scale advertising and presentations.
- A3 and A5 are ideal for smaller, indoor displays or more personal projects.
These sizes are so widespread because they fit standard printing equipment and frames, making them both practical and cost-effective.
How to choose the right size
Here are some handy tips to help you decide:
- Promotional posters: A1 or A2 – Big enough to catch attention, but still easy to display in shop windows or indoor venues.
- Decorative prints: A2 or A3 – Striking enough for artwork or photography, but not too overwhelming.
- Event signage: A0 or A1 – Perfect for grabbing attention at conferences, fairs, or large-scale events.
Small notices: A3 or A5 – Compact and practical for indoor announcements or handouts.
Remember to think about viewing distance – if your audience is far away, go bigger.
UK poster sizes chart
Here’s a simple table to help you compare the most common poster sizes in the UK:
| Size | Dimensions (mm) | Dimensions (inches) |
| A0 | 841 x 1189 | 33.1 x 46.8 |
| A1 | 594 x 841 | 23.4 x 33.1 |
| A2 | 420 x 594 | 16.5 x 23.4 |
| A3 | 297 x 420 | 11.7 x 16.5 |
| A5 | 148 x 210 | 5.8 x 8.3 |
Still unsure which size works best?
Explore our poster printing options and get inspired by real customer designs.