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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.
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.
The lumber is usually identified by the measurements of the green lumber before it was cut and dried, such as 2×4, 2×6, or 2×10. Find the actual size of different types of lumber and learn why the actual size of dimensional lumber is smaller than the nominal size.
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.
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.
Learning the actual lumber sizes that correlate to nominal lumber dimensions is the key to successful woodworking projects. The lumber size chart below will help you know what to buy and how to properly plan your project.
Dimensional lumber is a wood fiber that is cut to a specific thickness, width, and length based on predefined and standardized sizes. Some examples of lumber dimensions include 2 x 4s and 4 x 4s. You should also understand the different measurements for hardwood and softwood.
To effectively utilize lumber for projects, it is important to understand naming systems, grading rules, actual board sizes, volume measurements, and how to calculate required quantities. This article will provide a comprehensive guide to demystifying lumber dimensions and planning stock needs.
Nominal lumber sizes come in a range, each suited for specific applications in construction and woodworking. We’ll explore some common sizes and their typical uses: 2×4 (actual: 1.5″ x 3.5″): The workhorse of framing, used for walls, studs, and rafters.
For starters, you'll need to know that softwood (like pine, spruce, and fir) is measured and sold one way, and hardwood (like oak, maple, and cherry) is measured and sold in a totally different way. Don't get the two mixed up or you'll really be confused. Lumber sizes chart for 1x2, 2x4. Nominal size vs Actual size boards.