A Series Paper Size

Book size cover

ISO 216 is an international standard is a universal standard all over the world except in North America (the United States and Canada) and parts of Latin America. All ISO 216 paper sizes (except some envelopes) have the same aspect ratio, √2:1. A series paper is the most commonly used paper series in the ISO 216 international paper standard, and the A4 format paper in the A series is the most commonly used paper size in the world.

Among the A series papers, A0-A10 are more common, and A11, A12, A13, 2A0, 4A0, A0+, A1+, A3+ papers are too large or too small, resulting in few usage scenarios, so they are not commonly used.

Each ISO paper size is half the area of the next larger size paper in the same series, as shown in the figure. The sizes of all A series format papers in cm, mm and inch are listed below .

A Series Paper Size

Format/name	Width × Height (mm)	Width × Height (cm)	Width × Height (in)
A0	841 × 1189 mm	84.1 × 118.9 cm	33.1 × 46.8 in
A1	594 × 841 mm	59.4 × 84.1 cm	23.4 × 33.1 in
A2	420 × 594 mm	42 × 59.4 cm	16.5 × 23.4 in
A3	297 × 420 mm	29.7 × 42 cm	11.7 × 16.5 in
A4	210 × 297 mm	21 × 29.7 cm	8.3 × 11.7 in
A5	148 × 210 mm	14.8 × 21 cm	5.8 × 8.3 in
A6	105 × 148 mm	10.5 × 14.8 cm	4.1 × 5.8 in
A7	74 × 105 mm	7.4 × 10.5 cm	2.9 × 4.1 in
A8	52 × 74 mm	5.2 × 7.4 cm	2 × 2.9 in
A9	37 × 52 mm	3.7 × 5.2 cm	1.5 × 2 in
A10	26 × 37 mm	2.6 × 3.7 cm	1 × 1.5 in
A11	18 × 26 mm	1.8 × 2.6 cm	0.7 × 1 in
A12	13 × 18 mm	1.3 × 1.8 cm	0.5 × 0.7 in
A13	9 × 13 mm	0.9 × 1.3 cm	0.4 × 0.5 in
2A0	1189 × 1682 mm	118.9 × 168.2 cm	46.8 × 66.2 in
4A0	1682 × 2378 mm	168.2 × 237.8 cm	66.2 × 93.6 in
A0+	914 × 1292 mm	91.4 × 129.2 cm	36 × 50.9 in
A1+	609 × 914 mm	60.9 × 91.4 cm	24 × 36 in
A3+	329 × 483 mm	32.9 × 48.3 cm	13 × 19 in