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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 commonly used in the forestry and lumber industry to quantify wood volume.
The calculator uses the board feet formula:
Where:
Explanation: The formula approximates the volume of lumber that can be obtained from a log by squaring the diameter, multiplying by length, and dividing by 16 (a constant that accounts for saw kerf and other processing factors).
Details: Accurate board feet calculation is essential for lumber pricing, inventory management, and determining the value of standing timber. It helps both buyers and sellers understand the quantity of wood being traded.
Tips: Measure the diameter at the small end of the log (inside bark) in inches. Enter the length in feet. All values must be positive numbers.
Q1: Why divide by 16 in the formula?
A: The divisor 16 accounts for saw kerf (width of the saw cut), slab loss, and other processing factors that reduce the actual yield from a log.
Q2: How accurate is this formula?
A: It provides a rough estimate. Actual yield depends on log quality, sawing method, and operator skill. More precise methods like the Doyle or Scribner scales may be used commercially.
Q3: Should I measure diameter at the large or small end?
A: Measure at the small end inside bark (S.E.I.B.) for most accurate results with this formula.
Q4: Does this work for all tree species?
A: The formula works for all species, but actual yields vary based on wood density and log characteristics.
Q5: What's the difference between board feet and cubic feet?
A: Board feet measures lumber volume (1" thick × 12" × 12"), while cubic feet measures solid wood volume (12" × 12" × 12"). 1 cubic foot = 12 board feet.