About this calculator
Calculate board feet for timber and lumber.
A board foot is a volume measure equal to 144 cubic inches.
Formula
Board feet = thickness(in) × width(in) × length(ft) ÷ 12 × quantity.
Example
1in × 8in × 8ft × 4 pieces = 21.33 board ft.
Accuracy
NUMTX shows the assumptions next to the calculation so you can replace defaults with values that match your situation. For measurements, supplier rates, fees, interest, tax or regulated work, confirm important figures with the appropriate official or professional source.