9x12

9x12 is a notation used to describe a rectangle with sides measuring 9 and 12 units, most commonly inches or centimeters. In arithmetic, it is read as nine by twelve or nine times twelve, and the product is 108. The phrase is often used to denote the dimensions of physical objects or spaces that have a rectangular shape, and it implies a 3:4 aspect ratio.

As a measurement, 9×12 inches is a widely used size for photographs, prints, and artwork intended for framing. The metric equivalent is approximately 22.86 by 30.48 centimeters. This size is popular because it fits standard mats and frames, and its 3:4 aspect ratio aligns with many common photographic crops and compositions.

Other uses of the term appear in product specifications, catalogs, and presentation materials where a rectangular dimension is needed. In these contexts, 9x12 may designate the size of prints, mounting boards, envelopes, or packaging. While not a universal official standard, the size is well recognized in photography, printing, and visual design as a practical and commonly encountered dimension.