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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.
Find the actual size of different types of lumber and learn why the actual size of dimensional lumber is smaller than the nominal size.
The following data is standard reference and size data for commercially available lumber within the USA. All data is in imperial units (Inches).
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.
Get the facts on nominal lumber sizes with this guide. Understand the difference between nominal and actual dimensions to pick the right lumber.
Lumber is most often referred to by its nominal dimensions. Nominal dimensions may seem misleading but are common. Measure your area rug and it’s likely slightly smaller than its listed size.
The chart shows the difference between nominal and actual lumber sizes for dimensioned lumber, rough sawn lumber, dimensioned rough sawn lumber, rough sawn dimensions, square stock dimensions, round stock dimensions, quarter-sawn dimensions, and kiln-dried.
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.