Board Foot Formula:
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A board foot is a unit of measurement for the volume of lumber in the United States and Canada. It represents the volume of a one-foot length of a board one foot wide and one inch thick.
The calculator uses the board foot formula:
Where:
Explanation: The formula converts all dimensions to a common unit (inches) and divides by 12 to calculate the volume in board feet.
Details: Board foot measurement is essential in the lumber industry for buying and selling wood, estimating project costs, and determining how much lumber is needed for construction projects.
Tips: Enter thickness and width in inches, length in feet. All values must be positive numbers. The calculator will compute the volume in board feet.
Q1: What's the difference between board feet and linear feet?
A: Board feet measure volume (thickness × width × length), while linear feet only measure length regardless of width or thickness.
Q2: How many board feet are in a 2x4?
A: For an 8-foot 2x4: (1.5" × 3.5" × 8')/12 = 5.33 board feet (actual dimensions are 1.5" × 3.5").
Q3: Why divide by 12 in the formula?
A: Because a board foot is defined as 144 cubic inches (12" × 12" × 1"), and the formula converts all measurements to inches before calculating volume.
Q4: Does the calculator account for nominal vs. actual dimensions?
A: No, you must enter actual dimensions. For example, a "2x4" actually measures 1.5" × 3.5".
Q5: How is board foot pricing determined?
A: Lumber is often priced per board foot, calculated by multiplying the board footage by the price per board foot.