What affects the weight of lumber
Timber weight depends on two things: volume and density. The board dimensions tell you the volume of each piece, and the species plus moisture condition give a practical density estimate. A lumber weight calculator combines those factors to estimate the total stack weight before you lift, move, or transport the order.
This is useful because two stacks that contain the same board footage can still weigh very different amounts. Oak is heavier than cedar, and green timber is heavier than kiln-dried timber because of the moisture still held in the wood.