A0, A1, A2 or A3 Poster: Which Size Should You Choose?
Choosing the right poster size can make a difference to how clearly your message is seen and how well the poster fits its intended space. For businesses, events and organisations, common options include A0, A1, A2 and A3 posters.
The right choice depends on several factors, including viewing distance, available wall or display space, the amount of information in the design and where the poster will be placed. This poster size guide UK businesses can use explains the dimensions and practical uses of A0, A1, A2 and A3 posters.
A0, A1, A2 and A3 Poster Sizes
The A-series poster sizes follow a standard proportion, with each size becoming smaller as you move from A0 to A3.
| Poster Size | Dimensions | Typical Use |
|---|---|---|
| A0 | 841 × 1189 mm | Large displays, events and high-visibility areas |
| A1 | 594 × 841 mm | Events, retail displays and exhibitions |
| A2 | 420 × 594 mm | Indoor promotions, notices and displays |
| A3 | 297 × 420 mm | Smaller promotions, notices and information |
These are the dimensions currently listed on the corresponding iFix Prints product pages.
The dimensions alone, however, do not determine which size you should choose. Think about how far away people will be when they see the poster and how much physical space you have available.
What Is an A0 Poster?
An A0 poster measures 841 × 1189 mm. It is the largest of the four sizes covered in this guide.
A0 can be suitable when you need a large display area and want the poster to be visible in a spacious environment.
Typical applications include:
- Large event displays
- Exhibition spaces
- Storefront advertising
- Large venues
- Public notices
- High-traffic display areas
A0 gives a designer substantial space for imagery, headlines and supporting information. It can therefore be useful when the poster needs to make an impact from further away.
Before choosing A0, check the available display area. A large poster needs sufficient wall or display space and may not be practical for smaller locations.
What Is an A1 Poster?
An A1 poster measures 594 × 841 mm.
A1 sits between A0 and A2, making it a useful option when you want a noticeable display without using the physical space required by an A0 poster.
Common applications include:
- Retail displays
- Event promotions
- Office notice boards
- Cafes and restaurants
- Exhibitions
- Window displays
A1 can provide enough space for a strong headline, imagery and supporting information while remaining practical for many indoor display locations.
If your poster will be viewed from a moderate distance, consider whether the available space and design content suit A1 before moving to a larger or smaller format.
What Is an A2 Poster?
An A2 poster measures 420 × 594 mm.
A2 is smaller than A1 but still provides enough space for clear promotional or informational content.
iFix Prints lists A2 posters for uses including:
- In-store promotions
- Office notices
- Menu boards
- Reception areas
- Educational displays
- Point-of-sale use
A2 can be useful where wall space is more limited but you still need a poster that is easy to notice.
For example, a reception area may not have enough space for an A0 or A1 poster. An A2 design can provide a practical balance between display area and available space.
What Is an A3 Poster?
An A3 poster measures 297 × 420 mm.
It is the smallest of the four sizes in this guide and can be useful for more compact indoor displays.
Typical uses include:
- Office notices
- Retail promotions
- Menus and price lists
- Community boards
- Events and announcements
- Classroom displays
A3 is particularly useful when the poster will be placed on smaller notice boards, walls, counters or other areas where a larger format would be difficult to accommodate.
It can also work well when the viewing distance is relatively short.
How Do You Choose the Right Poster Size?
Instead of choosing a poster size simply because it is larger, consider these five factors.
1. Viewing Distance
Think about how far away your audience will normally be.
If people will view the poster from a distance, a larger format may provide more room for a large headline and prominent visual elements.
For close-range displays, a smaller size may provide enough space.
2. Available Display Space
Measure the wall, window, notice board or display area before ordering.
For example, an A0 poster measures 841 × 1189 mm, while an A3 poster measures 297 × 420 mm. The difference in physical size is significant, so the available area should be checked first.
3. Amount of Information
Consider how much information your design contains.
A poster with a short headline, image and simple call to action may not require a large format.
A poster containing several pieces of information may require more design space, although increasing the physical size should not be used as a reason to overcrowd the design.
4. Placement
Where will the poster be displayed?
A0 or A1 may suit larger exhibition or event spaces, while A2 or A3 may be more practical for offices, reception areas and smaller displays.
5. Design Priorities
Your design should remain readable at the intended viewing distance.
Avoid trying to fit too much small text into a poster. A clear headline, strong visual hierarchy and concise information can make the available space more effective.
A0 vs A1 vs A2 vs A3: Which Should You Choose?
There is no single poster size that is right for every situation.
Use this simple guide:
Consider A0 when:
- You have a large display area.
- The poster needs strong visibility.
- It will be displayed in a spacious venue.
- You need substantial design space.
Consider A1 when:
- You need a prominent poster.
- The display area is smaller than required for A0.
- You are promoting an event or exhibition.
- You need a balance between size and practicality.
Consider A2 when:
- The poster will be displayed indoors.
- Wall space is more limited.
- You need a medium-sized promotional or informational display.
- The audience will generally be relatively close.
Consider A3 when:
- Display space is compact.
- The poster will be viewed from a shorter distance.
- You need an office, retail or notice-board display.
- The design contains a focused amount of information.
What Else Should You Consider Before Poster Printing?
Size is only one part of the printing decision.
You should also consider:
- Paper or material
- Finish
- Colour requirements
- Artwork quality
- Image resolution
- Bleed and print margins
- Indoor or outdoor placement
- Quantity required
- Whether the design needs professional assistance
iFix Prints currently lists matte, gloss and satin finish options on its A0 and A1 poster pages, while the A2 and A3 pages also provide poster printing and customisation options.
If your artwork is not ready, check whether design assistance is available before sending the file to print.
Poster Size Guide UK: Quick Decision
If you need a simple starting point, use the following approach:
Large venue or high-visibility display → A0
Event, exhibition or prominent display → A1
Indoor promotion or medium display → A2
Notice board, office or compact display → A3
This is a starting point rather than a universal rule. The final choice should consider the actual display environment, viewing distance, design and available space.
Frequently Asked Questions
What are A0, A1, A2 and A3 poster sizes?
A0 is 841 × 1189 mm, A1 is 594 × 841 mm, A2 is 420 × 594 mm and A3 is 297 × 420 mm. Each size provides a different amount of physical display area, so the appropriate option depends on the placement, viewing distance and amount of content in your design.
Which poster size is best for an event?
The appropriate event poster size depends on the venue, display space and viewing distance. A0 or A1 can provide a larger display area for events and exhibitions, while A2 or A3 may be more practical for smaller indoor locations. Check the available display space before selecting the final size.
Is A1 bigger than A2?
Yes. An A1 poster measures 594 × 841 mm, while an A2 poster measures 420 × 594 mm. A1 therefore provides a larger physical display area. The choice between them should depend on where the poster will be displayed and how far away the audience is likely to view it.
What size poster is best for a notice board?
A2 or A3 can be practical options for many notice boards, particularly where available space is limited. A3 measures 297 × 420 mm and can suit compact information displays, while A2 measures 420 × 594 mm and provides more space for larger visuals and information.
What size poster is best for an exhibition?
A0 or A1 may be suitable for exhibition displays where you have sufficient space and need a prominent visual presentation. The final choice should take account of the exhibition stand, wall or display area, viewing distance and other graphics competing for attention.
Can I print a custom-size poster?
Yes. iFix Prints states on its poster product pages that custom poster sizes are available. If a standard A0, A1, A2 or A3 format does not fit your display area, a custom size may be an option.
Should I choose A0 or A1 for a large poster?
Both A0 and A1 provide substantial display areas, but A0 is physically larger. Consider the available wall or display space, expected viewing distance and amount of design content. If the display area cannot comfortably accommodate A0, A1 may be a more practical format.
Can posters be used outdoors?
Poster suitability for outdoor use depends on the material and finishing selected. iFix Prints states on its poster product pages that weather-resistant materials are available for outdoor posters. Confirm the appropriate material and finish for your intended environment before ordering.
