Here are the main sizes of paper according to the international ISO 216 standard:

А0 — is used for creating technical drawings and printing posters. Its size is 841×1,189 mm.
А1 — is used for creating technical drawings, printing geographical maps, posters, and large-format advertising materials. Its size is 594×841 mm.
А2 — is used for drawing, making flipcharts, printing photos, graphics, posters, and large wall calendars. Its size is 420×594 mm.
А3 — is used to print drawings, artwork replicas, posters, photos, magazines, certificates, leaflets, and much more. It is also a popular format for conference booklets and park guides. Its size is 297×420 mm.
А4 — is the classic format for printers. It is used for creating big notepads, printing documents, kids’ books, encyclopedias, magazines, and leaflets. Its size is 210×297 mm.
А5 — is a popular format for notepads, books, magazines, leaflets, and fliers. Its size is 148×210 mm.
А6 — is a format for postal and greeting cards as well as leaflets, pocket-sized books, and notepads. Its size is 105×148 mm.
А7 — is a small format that is used for printing mini-calendars, planners, leaflets, and greeting cards. Its size is 74×105 mm.
А8 — is used for printing business cards, loyalty cards, mini-greeting cards, stickers, and labels. Its size is 52×74 mm.

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