Board Feet Formula:
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Board feet is a unit of measurement for the volume of lumber. One board foot equals 144 cubic inches (12" × 12" × 1"). It's the standard measurement used in the lumber industry for buying and selling wood.
The calculator uses the board feet formula:
Where:
Explanation: The formula converts all dimensions to a common unit (inches) and divides by 12 to get the volume in board feet.
Details: Accurate board feet calculation is essential for lumber purchasing, project planning, and cost estimation in woodworking and construction projects.
Tips: Enter thickness and width in inches, length in feet. All values must be positive numbers. The calculator will compute the board footage of your lumber.
Q1: Why divide by 12 in the formula?
A: Because one board foot equals 144 cubic inches (12" × 12" × 1"), and we're converting length from feet to inches in the calculation.
Q2: How do I calculate board feet for multiple pieces?
A: Calculate board feet for one piece, then multiply by the number of identical pieces.
Q3: Does board feet account for wood defects?
A: No, board feet measures gross volume. Actual usable wood may be less due to knots, cracks, or other defects.
Q4: How does thickness affect board feet?
A: Thicker boards yield more board feet per linear foot. For example, a 2" thick board has twice the board feet of a 1" thick board of the same length and width.
Q5: What's the difference between board feet and linear feet?
A: Linear feet measures length only, while board feet measures volume (length × width × thickness).