Poster Size Guide: How to Choose the Right Wall Art for Your Space

Choosing wall art is the enjoyable part. Choosing the correct size can feel a little more complicated.

A poster that looks perfectly proportioned online may appear too small above a large sofa, while an oversized print can overwhelm a narrow hallway. Before choosing a design, it helps to begin with the space you are decorating.

This guide explains how to measure your wall, understand common poster sizes and select artwork that feels balanced within your home.

Start with the wall

Before thinking about specific poster dimensions, take a step back and look at the wall as a whole.

Consider:

• The total width and height of the wall
• Any furniture positioned beneath it
• The amount of empty space surrounding the artwork
• Whether you want one statement piece or several smaller prints
• Whether the poster will be framed or unframed

Use a tape measure to record the available wall space. You can then mark out possible poster sizes using masking tape or paper. This gives you a much clearer idea of how the finished artwork will look before ordering.

Consider the furniture beneath it

When hanging artwork above a sofa, bed, desk or sideboard, the furniture should help determine the size of the poster.

As a general visual guide, your artwork or complete gallery wall should cover approximately two-thirds of the width of the furniture beneath it.

For example, a wide sofa will normally suit:

• One large A1 or A0 poster
• Two coordinating A2 posters
• Three A3 posters arranged as a set
• A mixed gallery wall covering a similar overall width

Smaller furniture, such as a bedside table or narrow console, may suit an A4 or A3 print instead.

The artwork should feel connected to the furniture rather than appearing to float separately above it.

A poster sizes explained

The A-size system is widely used throughout the UK and Europe. Each size keeps the same proportions, meaning an artwork can be enlarged or reduced without changing its overall shape.

A5 – 14.8 × 21 cm

Approximately 5.8 × 8.3 inches

A5 is a compact poster size that works well on shelves, bedside tables, desks and smaller sections of a gallery wall.

A4 – 21 × 29.7 cm

Approximately 8.3 × 11.7 inches

A4 is similar to a standard sheet of printer paper. It is ideal for smaller walls, home offices, shelves and gallery-wall arrangements.

A3 – 29.7 × 42 cm

Approximately 11.7 × 16.5 inches

A3 provides more impact while remaining easy to style. It works well above a desk, beside a bed or as part of a two or three-piece arrangement.

A2 – 42 × 59.4 cm

Approximately 16.5 × 23.4 inches

A2 is a versatile medium-to-large poster size. It is suitable for bedrooms, living rooms, dining spaces and feature walls.

A1 – 59.4 × 84.1 cm

Approximately 23.4 × 33.1 inches

A1 creates a strong focal point without completely dominating the room. It works particularly well above sofas, beds, fireplaces and larger pieces of furniture.

A0 – 84.1 × 118.9 cm

Approximately 33.1 × 46.8 inches

A0 is designed to make a statement. It is best suited to large open walls, spacious living rooms, dining rooms and commercial interiors.

What is an aspect ratio?

An aspect ratio describes the relationship between the width and height of an image.

For example, a poster with a 2:3 ratio could be printed at 12 × 18 inches, 16 × 24 inches or 20 × 30 inches. Although the dimensions change, the proportions remain the same.

Understanding aspect ratios is especially useful when choosing frames or ordering custom-sized artwork.

Common poster aspect ratios

A sizes

A5, A4, A3, A2, A1 and A0 all share the same A-series proportions.

2:3 ratio

Common sizes include:

12 × 18 inches
16 × 24 inches
20 × 30 inches
24 × 36 inches

3:4 ratio

Common sizes include:

6 × 8 inches
12 × 16 inches
18 × 24 inches
24 × 32 inches
30 × 40 inches

4:5 ratio

Common sizes include:

8 × 10 inches
16 × 20 inches

5:7 ratio

Common sizes include:

5 × 7 inches
20 × 28 inches

Some dimensions, including 11 × 14, 11 × 17 and 28 × 40 inches, use their own proportions. Choosing the correct ratio prevents important parts of a design from being cropped when it is resized.

Choosing a poster size for each room

Living room

Living rooms generally have larger walls and furniture, so smaller prints can easily become lost.

For the wall above a sofa, consider:

• A1 or A0 for one statement poster
• Two A2 posters displayed side by side
• Three A3 prints for a coordinated collection
• A gallery wall combining A3, A4 and A5 artwork

Bedroom

Artwork above a bed should feel calming and proportionate to the width of the headboard.

Popular options include:

• One centred A1 poster
• Two matching A2 posters
• Three A3 prints positioned evenly
• Smaller A4 prints above bedside tables

Home office

A4 and A3 posters are ideal for home offices because they add personality without overwhelming the workspace.

An A2 poster can also create a stronger focal point above a desk.

Hallway

Hallways usually benefit from vertical arrangements.

Try:

• A row of matching A4 or A3 posters
• One tall A2 or A1 print
• A gallery wall following the direction of the hallway
• Small framed prints displayed at consistent intervals

Dining room

A2, A1 and A0 posters work particularly well in dining spaces. A large landscape-style piece or a set of coordinating prints can help visually anchor the dining table.

One large poster or a gallery wall?

Both options can transform a room, but they create different effects.

Choose one large poster when:

• You want a clean and minimal appearance
• The artwork is intended to be the main focal point
• You have a large uninterrupted wall
• You prefer simple styling

Choose a gallery wall when:

• You want to combine different designs or themes
• You have several smaller pieces of artwork
• You enjoy a more layered and personal look
• You want the option to expand the collection over time

Before installing a gallery wall, arrange the frames on the floor and photograph the layout. You can then recreate the arrangement on the wall with more confidence.

Remember to include the frame

The finished dimensions will be larger once your poster is framed.

A frame with a mount can add several centimetres around every side of the artwork. This can make a smaller poster feel more substantial and create additional breathing room around the design.

Always check:

• The exact frame dimensions
• Whether the frame includes a mount
• The size of the visible opening
• Whether the listed measurement refers to the print or the complete frame

Small variations between frame manufacturers are normal, so check the product measurements before ordering.

How high should wall art be hung?

As a starting point, position the centre of the artwork at approximately eye level.

When hanging a poster above furniture, leave enough space for the artwork to feel connected to the furniture without sitting directly on top of it. A gap of approximately 15 to 25 cm often works well, although the best position will depend on the height of the room and furniture.

For a group of posters, treat the entire arrangement as one piece and centre the full display rather than each individual frame.

A quick poster-size checklist

Before ordering your wall art, ask yourself:

• Have I measured the wall?
• Is there furniture beneath the artwork?
• Do I want one statement print or a collection?
• Will the artwork be framed?
• Have I checked the frame’s exact dimensions?
• Does the design use the correct aspect ratio?
• Have I tested the size using masking tape or paper?

Taking a few minutes to plan the layout can make a significant difference to the finished result.

Find the perfect print for your wall

At PostersByRhea, our collection includes modern wall art inspired by travel, automotive culture and minimalist design. With a variety of sizes and framed or unframed options available, you can find artwork that fits both your space and your personal style.

Explore the PostersByRhea collection and start creating a wall you will enjoy looking at every day.