Understanding Nominal vs Actual Lumber Sizes - Olympic Industries
https://olympicind.com/article/understanding-nominal-vs-actual-lumber-sizes/
WEBWhile the nominal dimensions of 2x4s and 2x6s are 2 inches by 4 inches and 2 inches by 6 inches, respectively, their actual dimensions are slightly smaller. The 2x4s and 2x6s are typically ½ inch less than their nominal widths. Similarly, the 2x8s, 2x10s, and 2x12s have actual widths that are ¾ of an inch less than their nominal sizes.
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