The A-series in plain numbers
- A4, 210 × 297 mm (standard paper)
- A3, double A4 (297 × 420 mm)
- A2, double A3 (420 × 594 mm)
- A1, double A2 (594 × 841 mm)
- A0, double A1 (841 × 1189 mm)
Every step up doubles the area. Anything smaller than A3 reads as a handout, not a poster.
A3, for indoor notice boards
A3 posters live on lift walls, cafe notice boards and classroom doors. Read from 1–2 metres. Good for detailed information: event schedules, menus, policy notices. Cheap to print and easy to replace when details change.
A2, the event and promotion size
A2 is the most common "poster" size in the UK. Read from 2–4 metres. Suitable for shop windows, bus-stop-style promotions and academic conference posters. Fits on most copy-shop printers with no special equipment.
A1, A0 and beyond
A1 and A0 are true large-format posters, read from 4+ metres. Ideal for exhibition stands, retail displays and film festival boards. Usually printed on roll-fed wide-format printers rather than sheet printers, expect a longer turnaround and slightly higher price per sheet.
In short
We handle A4 through A2 as standard and can arrange A1/A0 through a large-format partner. Ask about mounting or lamination at the same time, laminating an A2 poster doubles its life.
Published 15 April 2026 by the Copy Shop Putney team. Shop 395-A, Tildesley Rd, Putney Heath, London SW15 3BD.