Which formula is used to calculate BF (Board Feet)?

The formula used to calculate board feet is defined as the volume of lumber expressed in a specific unit called board feet. The correct way to determine board feet is to measure the thickness (T), width (W), and length (L) of a piece of lumber in inches. The formula specifically represented as T x W x L calculates the total cubic inches of the board; however, to convert this measurement into board feet, it also assumes the thickness is in inches, and then the result can be divided by 144 (since a board foot is equivalent to 144 cubic inches).

Thus, using T x W x L gives you the necessary dimensions to arrive at the volume needed to assess the board feet accurately. Other options represent different measurements or calculations unrelated to this specific calculation of lumber volume for board feet. For instance, L x W x H pertains more to the volume of a rectangular box in three dimensions, while the geometric calculations involving perimeter or cross-sectional area are not involved in the board foot measurement. Therefore, the formula T x W x L is correct for calculating board feet.