## ISO – A Series Paper Sizes for Drawing

ISO 216 standard system has defined the A – series which consists of a logical set of paper sizes. The largest size A0 measures one square meter (1 m2). Height to width ratio of all pages is the square root of two (i.e. 1.4142: 1) remains constant for all sizes. This means you get the A1 size by folding an A0 paper in two along its shortest side. Then fold the A1 size in two to get an A2 size paper, and so on as shown in figure…

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### ISO Sizes A series

#### Size in Inches

A0 841 mm x 1189 mm 84.1 cm x 118.9 cm 0.841 m x 1.189 m 33 in x 46.81 in
A1 594 mm x 841 mm 59.4 cm x 84.1 cm 0.594 m x 0.841 m 23.39 in x 33 in
A2 420 mm x 594 mm 42.0 cm x 59.4 cm 0.42 m x 0.594 m 16.54 in x 23.36 in
A3 297 mm x 420 mm 29.7 cm x 42.0 cm 0.297 m x 0.42 m 11.69 in x 16.54 in
A4 210 mm x 297 mm 21.0 cm x 29.7 cm 0.21 m x 0.297 8.27 in x 11.69 in
A5 148 mm x 210 mm 14.8 cm x 21. 0 cm 0.148 m x 0.21 m 5.83 in x 8.27 in
A6 105 mm x 148 mm 10.5 cm x 14.8 cm 0.105 m x 0.148 m 4.13 in x 5.83 in
A7 74 mm x 105 mm 7.4 cm x 10.5 cm 0.074 m x 0.105 m 2.91 in x 4.13 in
A8 52 mm x 74 mm 5.2 cm x 7.4 cm 0.052 m x 0.074 m 2.05 in x 2.91 in
A9 37 mm x 52 mm 3.7 cm x 5.2 cm 0.037 m x 0.052 m 1.46 in x 2.05 in
A10 26 mm x 37 mm 2.6 cm x 3.7 cm 0.026 m x 0.037 m 1.02 in x 1.46 in

Other standard series of ISO are B series & C series.