3/30/2024 0 Comments 4 inches by 6 inches actual size![]() If you’re stuck without a tape measure or reference table, you can also use a simple rule of thumb to determine the actual size of dimensional lumber. Table showing the nominal size and actual size of dimensional lumber in inches and millimeters Nominal Size The table below shows the actual size versus the nominal size of various dimensional lumber products. ![]() The board is advertised and sold using nominal dimensions, which are a bit larger than the actual dimensions. The actual sizes of a board are smaller than that.įor example, a 2×4 board is actually 1 1/2″ x 3 1/2″. These are the dimensions of the green board before it’s been dried and milled. Dimensional lumber is lumber that has been dried and milled to standard dimensions and is most commonly used for framing and construction.ĭimensional lumber is sold using what is referred to as the nominal dimensions of a board. ![]() Most softwood lumber sold at the lumber yard or home improvement store is dimensional lumber, such as pine or Douglas fir. Wood and lumber are no different, and for most dimensional lumber, you will find that the material is sold and listed by its nominal size, rather than its actual size. For some, it’s historical while others may be in the way they are designed to be installed. In fact, most building materials are sold by nominal, rather than actual, sizes for a variety of reasons. Hopefully, you haven’t been burned by assuming that a 2×4 is actually two inches by four inches but if you have, know that you’re not alone. You may have seen framing lumber and softwood boards sold by listed dimensions that don’t match the actual size of the board.
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