30E

30E is a bra size designation used in several Western lingerie sizing systems, most commonly in the United Kingdom and in many European brands. The "30" refers to the underbust band measurement, while the "E" denotes the cup size, indicating a relatively large bust for that band. Because cup volumes are not standardized across manufacturers, the exact equivalent of 30E can differ between brands and regions; some brands map E to what others call DD, DDD, or F. As a result, 30E may be labeled differently in US sizing (for example, 30DD or 30DDD in some lines).

Determining the size involves two measurements: the underbust circumference and the fullest bust circumference. The difference between bust and underbust measurements guides the cup letter, with each step generally representing a larger cup. For a given band size, E is a relatively large cup, so a 30E bra should fit with a snug band and a cup that fully encloses the breast without overflow or gaping. Because brands vary in cut and cup volume, trying multiple styles (different brands, seamed versus molded cups, and varying strap widths) is common.

Availability of 30E varies by retailer; it may be more common at specialty lingerie shops than in mass-market stores. Proper fitting, either self-measured or with a professional fitter, is advised, as improper fit can cause discomfort and inadequate support. Consumers should be aware of regional sizing differences and consider trying sister sizes (such as nearby band or cup letters) when a perfect 30E is not readily available.