Glossary: Nominal Dimension
**Nominal Dimension** is the commercial size designation of lumber (e.g. 2x4), which is larger than the actual dressed size (e.g. 1.5" x 3.5") after drying and planing.
Standard Lumber Sizing
Nominal timber dimensions are standard designations for mill cuts. Planing processes trim outer surfaces, reducing actual dimensions. Building calculations must account for actual dimensions for structural fits.