Paper size series

ISO A series: Dimensions Chart

The international paper standard (ISO 216). Every A size has an aspect ratio of 1:√2, so cutting a sheet in half produces the next size with the same proportions. A0 has an area of exactly one square metre.

Sizes to scale

Size	Millimetres	Inches	Pixels @ 300 dpi	Typical use
A0	841 x 1189 mm	33.11 x 46.81 in	9,933 x 14,043	Engineering and architectural drawings, large posters.
A1	594 x 841 mm	23.39 x 33.11 in	7,016 x 9,933	Posters, flip charts, technical drawings.
A2	420 x 594 mm	16.54 x 23.39 in	4,961 x 7,016	Posters, art prints, drawing pads, large calendars.
A3	297 x 420 mm	11.69 x 16.54 in	3,508 x 4,961	Drawings, diagrams, menus, small posters, spreadsheets.
A4	210 x 297 mm	8.27 x 11.69 in	2,480 x 3,508	Letters, office documents, magazines, forms and catalogues — the standard sheet outside North America.
A5	148 x 210 mm	5.83 x 8.27 in	1,748 x 2,480	Notebooks, diaries, flyers, booklets and paperback books.
A6	105 x 148 mm	4.13 x 5.83 in	1,240 x 1,748	Postcards, pocket notebooks and Japanese bunko paperbacks.
A7	74 x 105 mm	2.91 x 4.13 in	874 x 1,240	Pocket notepads, labels, small flyers.
A8	52 x 74 mm	2.05 x 2.91 in	614 x 874	Playing cards (approximately), labels, tickets.
A9	37 x 52 mm	1.46 x 2.05 in	437 x 614	Tickets, small labels.
A10	26 x 37 mm	1.02 x 1.46 in	307 x 437	Stamps and tiny labels.
2A0	1189 x 1682 mm	46.81 x 66.22 in	14,043 x 19,866	Very large posters and plans (two A0 sheets).
4A0	1682 x 2378 mm	66.22 x 93.62 in	19,866 x 28,087	The largest A-format sheet, for giant posters.