![]() These sizes also don't apply to woods like MDF, particle board, plywood, OSB or LVL, which are manufactured and use actual sizes. When you buy hardwoods at an actual lumber yard, they sizes are different. The dimensions are for the wood's thickness and width, and the boards are sold by the lineal (running) foot.įor hardwoods sold at Home Depot and Lowes, ones planed on all four sides (known as S4S, surfaced 4 sides), they are the dimensions as the softwood chart. This means a 1×10 is actual 3/4 inches in its thickness by 9 1/4 inches. The larger 1x boards (1×10, 1×8, etc.) lose 3/4 inches in their width. Here is a table with the most common dimensional lumber sizes for softwoods. 1×6 and 1×4 boards lose 1/4 inch in thickness and 1/2 inch in their width prior to leaving the mill which means a 1×4 board is actually 3 1/2 inches by 3/4 inches. With pieces more than six inches, subtract 3/4 of an inch. Here is a table showing nominal sizes vs actual sizes for reference.For pieces between one and six inches, subtract 1/2 inch. ![]() 1/4 inch less for pieces of lumber that are one inch.Lets say you have a piece of random width oak with an actual size of 7/8 thick by 7 3/4. ft.) 5.33 ft²: Nominal Product Length (ft.) 8 ft: Nominal Product Thickness (in.) 1: Nominal Product Width (in. Hardwoods have less moisture so they shrink less (click for their dimensional sizes). Thickness x Width x Length / 12 Board Feet. Actual Product Length (ft.) 8 ft: Actual Product Thickness (in.) 0.75 in: Actual Product Width (in.) 7.25 in: Coverage Area (sq. Software lumber dimensions – can generally be estimated as follows, for softwoods. Nominal dimensions: 1 inch x 8 inches x 8 feet Actual dimensions: 3/4 inch x 7-1/4 inches x 8 feet Tongue-and-groove edges 3 common grade The image shown.Dimensional lumber – is the size of wood when it's dried and planed.Nominal lumber size – is the size wood is when it's cut at the lumber mill.The simple, non-technical explanation is that when you talk about lumber, you call it a “2 by 4” and when you measure it, you'll find the smaller dimensions. To this day it boggles my mind that a 2 x 4 piece of lumber is only 1 1/2 x 3 1/2 inches, but it's not going to change so it's time to learn lumber sizes. Here is a convenient chart of nominal dimension lumber sizes and their actual dimensions: Nominal Measurement. As the teacher explained the different ways lumber sizes are used, I didn't know what to write down or which dimensions to use when. I discovered this when taking my first carpentry class and tried to take notes. When you buy lumber, understanding lumber sizes can be very confusing.
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