A3 vs A4 vs A5 Posters: Which Size Is Right for Your Wall?

Buying posters online is easy — picturing their size on your wall is not. Here is the simple version.

The sizes in numbers

• A5: 14.8 × 21 cm (5.8 × 8.3 in) — about the size of a notebook.
• A4: 21 × 29.7 cm (8.3 × 11.7 in) — a printer sheet. Our most popular size.
• A3: 29.7 × 42 cm (11.7 × 16.5 in) — exactly two A4s side by side.
• 12 × 18 inch: 30.5 × 45.7 cm — a tall statement size for selected designs.

Which size for which wall?

Single poster above a bed or sofa: A3. Anything smaller looks lost on a big wall.

Study desk or hostel wall: a 3 × 3 grid of A4 posters. It fits most walls between a window and a cupboard.

Collage or budget makeover: A5. Sixteen A5s cover more area than you think and cost less than a single framed print.

Narrow wall beside a door: three or four A4s stacked vertically.

A quick trick before you order

Cut newspaper to the size you are considering and tape it to the wall for a day. If you keep noticing it — it is the right size.

Full table, scale drawing and sticking tips: poster size guide. Ready to choose? Browse wall posters or save with a build-your-own 12 A4 pack.