An A2 piece of paper measures 420 × 594 mm or 16.5 × 23.4 inches . Cutting it in half will create two A3 sheets of paper. An A2 piece of paper will fit into a C2 envelope. When folded in half, it will fit into a C3 envelope. A2 is part of the A series and is defined by the ISO 216 international paper size standard. Learn about the A2 size , a commonly used paper size for posters and calendars. Find out the exact numbers for A2 in different units, such as millimetres, centimetres, inches, pixels and more. A2 paper is part of the ISO 216 standard and is typically used for medium size posters, architectural drawings and diagrams. A2 is used everywhere except for North America and parts of Latin America. The size of A2 paper measures 420 x 594 millimeters. It is the third largest sized paper in the A Series and is exactly half the size of A1 paper. A2 size measures 16.54 x 23.39″ in inches, 420 x 594 in mm, and 42.0 x 59.4 in cm. A2 paper sheet is mostly used to make medium-sized posters, architectural drawings, and complex data charts.