RuledSheet

A0 paper size

A0 is 841 × 1189 mm (33.11 × 46.81 in). Its area is one square metre, and every other A size is A0 halved again and again.

A0
Millimetres841 × 1189 mm
Centimetres84.1 × 118.9 cm
Inches33.11 × 46.81 in
PDF points (1/72 in)2383.94 × 3370.39 pt
Pixels at 72 dpi2384 × 3370 px
Pixels at 150 dpi4967 × 7022 px
Pixels at 300 dpi9933 × 14043 px
A0A1Tabloid
Drawn to the same scale.
A0 next to its neighbours
SizemminchesDifference from A0
A0841 × 118933.11 × 46.81—
A1594 × 84123.39 × 33.11Half the area
Tabloid / Ledger (11 × 17)279.4 × 431.811 × 17-561.6 mm wide, -757.2 mm tall

What A0 is used for

  • Scientific and conference posters
  • Engineering and architectural drawings
  • Large wall maps

Larger than A0

2A0 (1189 × 1682 mm) and 4A0 (1682 × 2378 mm) exist for very large prints, but they are rarely used.

Questions

How big is A0 in pixels?

9933 × 14043 px at 300 dpi. Posters are usually printed at 150 dpi or less: 4967 × 7022 px.

Why is A0 841 × 1189 mm?

Those sides have the ratio 1 : √2 and multiply to one square metre (rounded to whole millimetres).