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Board Feet Calculator

Calculate board feet of lumber

Board Feet Calculator

All measurements in inches except length (feet)

Board feet is the standard unit of measurement for lumber volume in North America. One board foot = 1 inch thick × 12 inches wide × 12 inches long = 144 cubic inches. It is used to price and quantify rough-sawn timber.

  1. 1Board feet = (Thickness in inches × Width in inches × Length in feet) / 12
  2. 2Or: (T × W × L in inches) / 144
  3. 3For nominal vs actual: a "2×4" is actually 1.5"×3.5" — always use actual dimensions for accurate volume
1" × 6" × 8 ft board=4 board feet1×6×8÷12 = 4
2" × 8" × 12 ft=16 board feet2×8×12÷12 = 16

Fun Fact

The board foot unit dates to 17th-century British colonial timber trade. Despite its archaic origins, it remains universal in North American sawmill pricing.

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