A1 Paper Size

A1 measures 594 × 841 mm (23.39 × 33.11 inches), making it exactly half the area of A0. Defined by ISO 216, A1 is widely used for architectural drawings, flip charts, and large posters that require visibility from a moderate distance.

What Size is A1 in Inches?

A1 is 23.39 × 33.11 inches (594 × 841 mm), exactly half of A0 and the most common size for academic and conference posters.

A1 in Pixels

Pixel dimensions depend on your target DPI (dots per inch). Higher DPI means more pixels and sharper print output. 300 DPI is the standard for commercial printing.

Use our free Inches to Pixels converter or Millimeters to Pixels converter to calculate pixel dimensions at any DPI.

A1 with Bleed

When preparing files for commercial printing, add bleed — extra design area beyond the trim edge that gets cut off during finishing. The standard bleed for ISO sizes is 3 mm per side.

Size Comparison

A1 is half of A0 and twice the size of A2. It is comparable in size to a large flip chart pad and significantly larger than US Tabloid (11 × 17 inches).

Common Uses

• Architectural and engineering drawings
• Flip charts for meetings and presentations
• Large posters and transit advertising
• Academic and conference poster presentations

Design Tips

• A1 still requires large-format printing — standard office printers cannot accommodate this size.
• At 300 DPI, the file is 7016 × 9933 pixels. For text-heavy academic posters, 150 DPI produces acceptable quality at typical viewing distances.
• A1 is a common size for conference and academic poster sessions. Check the event's size requirements before designing.
• Keep important content away from edges — allow at least 15-20 mm margins beyond the bleed area.