Which category does dimensional weight apply to?

Dimensional weight applies specifically to Priority mail services offered by postal carriers. This pricing method considers the dimensions of a package, in addition to its actual weight, to determine shipping costs. The rationale behind using dimensional weight is to account for the space a package occupies in addition to its weight. It ensures that packages that may be light but large are charged fairly for the space they take up on delivery vehicles.

Priority mail often involves shipping items that vary widely in size and shape, making this calculation particularly relevant. While other mailing options like Standard mail, First-class mail, and Express mail have their own pricing structures, dimensional weight is specifically associated with Priority mail to help manage the logistics of shipping efficiently.