A4 paper measures 210 by 297 millimeters or 8.27 by 11.69 inches. Its PostScript measurements round to 595 by 842 points. A4 is part of the ISO A or ISO 216 standard. Uses of A4 paper include magazine publishing, forms, catalogs and letters.
The ISO A or ISO 216 standard generally appears outside North America, in countries that use the metric measuring system. This paper standard, originally set in 1975, came from the German DIN 476 standard. The other primary paper size is letter size, which measures 216 by 279 millimeters or 8.5 by 11 inches, and it primarily sees use in North America.