A4 paper is the most commonly requested ISO (International Standards Organization) size by American Asian, and other worldwide businesses. It measures 8.27 x 11.69 inches (210 x 297 mm) and is slightly larger than the close equivalent to U.S. letter size, which measures 8.5 x 11 inches

. A4 paper is widely used for various purposes, such as printing letters, documents, federal forms, faxes, and magazine pages

. The dimensions of A4 paper in different units are as follows:

• In inches: 8.27 x 11.69 in.
• In centimeters: 210 x 297 mm.
• In millimeters: 210 x 297 mm

A4 paper is part of the A-series paper sizes, which are defined by the ISO 216 standard and used in various industries for the creation of magazines, posters, menus, flyers, calendars, notepads, and reports