9by13

9by13 is a numeric designation referring to rectangular dimensions of 9 by 13 units. The term is most commonly encountered in two contexts: culinary bakeware and visual media formats.

In cooking, 9by13 typically denotes a 9-inch by 13-inch baking pan, a standard size for home ovens. These pans are produced in a variety of materials—aluminum, stainless steel, glass, ceramic and silicone—and in several depths. They are widely used for preparing casseroles, lasagnas, brownies and sheet cakes because the size provides a practical balance between capacity and oven fit. Material choice affects heat conduction and release, with metal offering quicker, more even browning and glass or ceramic retaining heat longer.

In photography and print, 9by13 can indicate a rectangular print or negative size, often expressed in centimeters (9 cm by 13 cm) or other units depending on region and medium. As a proportion, the 9:13 ratio describes a specific aspect ratio that can be applied to prints, crops and layouts in graphic design. It appears less frequently than more standard aspect ratios but is used when particular framing or printing constraints call for those dimensions.

Beyond these uses, "9by13" may be employed informally to describe any object, format or specification defined by a 9-by-13 measurement. Context typically clarifies the units and intended application.