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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.
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 standard 2×4 is 1.5″x3.5″. Therefore, when you’re planning a construction project that involves several 2x4s, you need to make sure you use the actual dimensions and not the dimensions that are commonly used to describe these boards, i.e. 2″x4″.
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.
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.
A 2×4 is 3½ inches wide after it has undergone sanding and has been smoothened. After being cut and in raw condition, a 2×4 is approximately 4 inches wide. How long is a 2×4? A 2×4 is usually 8 feet long. This is the same length as a sheet of plywood or drywall. There are also 2×4 that are 92 ⅝” long, or roughly 7.7 feet.
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!