How this calc works

Board feet is how rough and hardwood lumber is priced — one board foot is 144 cubic inches, equal to a piece 12 inches wide, 1 inch thick, and 1 foot long. This calc takes thickness, width, and length and returns the board-foot total so you can price a stack the way the yard charges for it.

The trap is nominal versus actual dimensions, and how lumber is measured before it is surfaced. Hardwood is sold by the board foot at rough thickness in quarters (4/4, 5/4, 6/4). Know which dimension your supplier bills on before you multiply, or your cost estimate drifts from the invoice.

Common mistakes

The common error is mixing board feet with linear feet. Linear feet ignores width and thickness; board feet captures volume. Quote one and buy the other and the numbers will not reconcile.

The second is using surfaced (actual) thickness when the yard charges on the rough (nominal) thickness. A surfaced 4/4 board measures about 13/16, but you pay for the full 4/4 — bill on the dimension your supplier does.

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