A' size -- size in millimeters -- approx inches

2A0 -- 1,189 x 1,682 mm -- 46.8 x 66.2 in

A0 -- 841 x 1,189 mm -- 33.1 x 46.8 in

A1 -- 594 x 841 mm -- 23.4 x 33.1 in

A2 -- 420 x 594 mm -- 16.5 x 23.4 in

A3 -- 297 x 420 mm -- 11.7 x 16.5 in

A4 -- 210 x 297 mm -- 8.3 x 11.7 in

A5 -- 148 x 210 mm -- 5.8 x 8.3 in

A6 -- 105 x 148 mm -- 4.1 x 5.8 in

A7 -- 74 x 105 mm -- 2.9 x 4.1 in