Convert a lineal foot (Lf) amount of a certain width and thickness of lumber to board feet (bf).

A lineal foot is equal to a length of 12 inches. Forty lineal feet equals 40 feet of length. There is no conversion needed between lineal feet and feet.

The board foot is a North American lumber/timber volume measurement, and you calculate it from the actual board length and the nominal width and thickness of the board. One board foot equals 12 cubic inches.

Formula

bf = Lf * T * W /12

where bf = board feet
Lf = lineal feet
T the nominal thickness of the board in feet
W the nominal width of the board in feet

Example

Convert 1200 lineal feet of 2 x 4 to board feet;

bf = 1200 * 2 * 4 ÷ 12
9600 ÷ 12 = 800

1200 lineal feet of 2 x 4's has a volume of 800 board feet