Paper A0 is the largest paper in the A series. The size of A0 is exactly 1 square meter.

A0 paper dimensions

A0 paper size in millimeters is 841 x 1189 mm.

84.1 x 118.9 centimeters.

A0 paper size in inches is 33.1 x 46.8 in.

You would think that A0 was smallest and A10 biggest but that is not how it is. A0 is the largest paper and if you fold it along the longest side you will have the measurements of A1. Fold the A1 and you will get A2 and so on….