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The typical nominal dimensions for wood, such as 2 x 4, refer to the thickness and the width of the wood. If a third number is added onto the nominal dimensions, such as 2 x 4 x 96, it indicates the length of the wood. Different types of wood are sold according to different types of measurements.
2x4 and 2x6 boards lose 1/2 inch in thickness and 1/2 inch in width before leaving the mill. That means a 2 x 4 board is actually 1-1/2 inches by 3-1/2 inches. The larger 2x boards (2x8, 2x10, etc.) lose 3/4 inch in width.
The Actual Size of a 2×4. For example, a 2×4 board is actually 1 1/2″ x 3 1/2″. The board is advertised and sold using nominal dimensions, which are a bit larger than the actual dimensions. Actual Lumber Size Table. The table below shows the actual size versus the nominal size of various dimensional lumber products.
This chart shows the nominal (in name only) and corresponding actual (real) dimensions of common wood sizes like 2×4 dimensions and 1×4 lumber.
Here is a convenient chart of nominal dimension lumber sizes and their actual dimensions: When buying lumber, the nominal measurements differ from the actual measurements (so your 2x4 doesn't actually measure 2x4). Learn more.
Nominal Size Lumber: nominal size lumber is usually 2×4 or 2×6 and has an actual measurement of 3/4 inch by 4 1/2 inches (the height does not include the thickness). Actual Size Lumber: actual size lumber has an actual measurement of 1-1/2 inch by 6 inches.