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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.
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. Note: You can download and print the chart from Additional Information below.
Dimensional lumber has two size categories for width and thickness: nominal size and actual size. Dimensional lumber is wood lumber cut to pre-defined, standard sizes. A two-by-four (2x4) is an example of dimensional lumber.
Here's everything you need to know about 2x4 lumber! What are the actual dimensions of a 2x4, the best saw to cut 2 by 4 wood, what screws to use in a 2x4 and project ideas to get you started!
In the case of a common board 2×4, the actual dimensions are 1.5”x3.5”. A few reasons explain why both nominal and actual dimensions are used to indicate wood’s size, and these are discussed in detail in the section below.
Dimensional lumber is cut to a specific length, width, and depth. However, there is a difference between the nominal size (what the lumber is referred to) and the actual size. The tables below provide both the nominal and actual lumber dimensions for many common North American lumber sizes.
Modern Lumber Dimensions Today, a 2×4 is actually 1.5 inches by 3.5 inches. These dimensions are widely recognized and used in construction projects around the world.
Discover why a 2x4 is not 2 by 4 inches. Follow the evolution of lumber size over time. Learn about nominal vs actual dimensions in modern standardized lumber
The most common dimensional lumber size for wall framing is two-by-fours (2x4). For floor joists and ceiling rafters, two-by-sixes (2x6) and two-by-eights (2x8) are most common. What Dimensional Lumber Grades are Available?