The weight of a 2-by-6-inch piece of wood varies based on the type of lumber and the moisture content of the lumber. On average, however, it weighs 2 pounds per foot.
Knowing the weight of lumber is important because it allows a person to determine how many boards can be carried to a job site and allows for the calculation of dead loads. The formula for calculating the weight of a piece of lumber is 62.4 X [ G / (1 + G X 0.009) X (m.c.)] X [1 + m.c./100]. In this formula, "G" represents the specific gravity of a known species of lumber, and "m.c." represents the moisture content of the lumber.