Base the size on the finished document, printer capacity, trimming plan, and edge that will eventually be bound. Standard letter sheets suit many reports and manuals, while half-letter, legal, A4, or ledger formats may be needed for compact guides, extended forms, or larger visual material. Allow for tabs, foldouts, and covers that may extend beyond the interior sheets. The available unpunched paper sizes make it easier to identify dimensions that fit the production equipment and final format. Before ordering in volume, print and trim a complete sample. Then punch and bind it with the intended supplies. This reveals whether margins, orientation, sheet edges, and cover dimensions work together without hiding text or leaving the document uneven.