Board Foot Calculator
Calculate board feet for lumber and wood projects with accurate volume measurements and cost estimates.
Quantity of lumber pieces
Lumber thickness in inches
Lumber width in inches
Lumber length in feet or inches
Cost per board foot for total price calculation
Enter lumber dimensions to calculate board feet
A board foot is a unit of measurement for lumber volume. One board foot equals 144 cubic inches or 1/12 cubic foot. It's calculated by multiplying thickness (inches) × width (inches) × length (feet) ÷ 12.
Calculation Formulas
Length in Feet
BF = (Length_ft × Width_in × Thickness_in) ÷ 12
Length in Inches
BF = (Thickness_in × Width_in × Length_in) ÷ 144
Key Conversions
1 Board Foot = 144 cubic inches
1 Board Foot = 1/12 cubic foot
Total BF = Number of pieces × BF per piece
Total Cost = Total BF × Price per BF
Example: A 2" × 6" × 8' board = (8 × 6 × 2) ÷ 12 = 8 board feet. For 10 pieces, total = 80 board feet.