Understanding Lumber Measurements
Lumber is sold in different ways depending on the project. Understanding the difference between Board Feet and Linear Feet is essential for accurate budgeting.
Board Feet (BF)
A Board Foot is a volume measurement. It represents a piece of wood that is 1 inch thick, 12 inches wide, and 1 foot long (or 144 cubic inches). It is the standard unit for buying hardwoods and rough-sawn lumber.
Formula: (Thickness × Width × Length) / 12
Linear Feet (LF)
A Linear Foot is simply a length measurement. It is typically used for trim, molding, and dimensional lumber (like framing studs) where the thickness and width are standard.
Formula: Length × Quantity
Nominal vs. Actual Size
Keep in mind that a "2x4" is actually 1.5 inches by 3.5 inches after planing and drying. For estimating structural projects, use the nominal size. For precise volume calculations, use the actual size.