A measure for lumber, equal to a 1-inch thick board that is 1 foot long and 1 foot wide in nominal dimensions (a 2x4, for example, is less than 2 inches thick and 4 inches wide, but a 1-foot long 2x4 is still counted as 2/3 of a board foot); typically reported in thousands of board feet (mbf). Also used to estimate the volume of lumber that can be produced from logs and standing trees.