Timber Volume Calculator
Calculate Board Feet (Doyle Rule)
Formula
Doyle Rule: Board Feet = (D - 4)² × L / 16, where D = small-end diameter (inches), L = length (feet).
Frequently Asked Questions
What is the Doyle rule?
The Doyle log rule estimates lumber yield in board feet using: BF = (D-4)² × L / 16, where D is the small-end diameter in inches and L is the length in feet.
What is a board foot?
A board foot is a unit of lumber volume equal to a piece of wood 1 foot long, 1 foot wide, and 1 inch thick (144 cubic inches).
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