30×50

30×50 is a two-dimensional measurement commonly read as “30 by 50,” used to indicate the length and width of an object, space, or image. The meaning depends on the units attached to the numbers, and without units the expression conveys only a geometric size or a multiplication result.

If the dimensions are in centimeters, 30×50 cm describes an area of 1500 square centimeters (1500 cm²). In meters, the same dimensions are 0.3 m by 0.5 m, giving an area of 0.15 square meters (0.15 m²). If the numbers are in inches, 30×50 inches equals 1500 square inches (about 10.42 ft²). In millimeters, 300×500 mm also yields 150,000 mm² (0.15 m²). The general principle is that the area is the product of the two measurements, once the units are specified and consistent.

Common uses for 30×50 include sizing in carpentry, framing, and construction where openings or panels are described by length and width. It is also a typical size reference for posters, canvases, or textiles, and can denote an aspect ratio; simplified, 30×50 reduces to 3:5, corresponding to a width-to-height proportion of 0.6.

Ambiguity can arise when units are omitted. In that case, 30×50 may simply indicate the product of the numbers, equal to 1500, or it may represent a dimension in some unspecified unit. As with any dimensional notation, specifying the unit is essential for clarity.