Board Foot Calculator

A board foot is a volume measurement (12″ × 12″ × 1″ = 1 BF); a linear foot is just a length measurement. Linear foot only tells you how long a piece is — it’s useful when width and thickness are standardized (like trim or 2x4s). Board foot accounts for all three dimensions, which is why hardwood lumber is priced by the board foot: boards of varying widths and thicknesses can still be priced fairly. Softwood dimensional lumber (2x4s, 2x6s) is typically priced per piece or per linear foot because the dimensions are standardized.

Nominal dimensions are the labeled size before milling; actual dimensions are the finished size after surfacing and drying. A “2×4″ actually measures 1.5″ × 3.5”. A “1×6″ actually measures 0.75″ × 5.5”. For board foot calculations, use nominal dimensions for rough lumber and softwood dimensional lumber, since that’s how lumber yards tally and charge. For pre-surfaced hardwoods, ask the supplier which method they use — most still calculate from rough dimensions, but practices vary.

Board foot prices vary widely by species and grade. Softwoods like pine and Douglas fir typically run $3–$8 per board foot at retail. Common hardwoods (oak, maple, cherry) run $5–$15 per board foot. Premium hardwoods (walnut, mahogany, quartersawn white oak) run $12–$30 per board foot, and exotic species (teak, ebony, cocobolo) can exceed $50 per board foot. Lumber yard prices are typically 30–50% lower than home center retail, especially on hardwoods — worth the trip for any project over a few hundred dollars in materials.

A standard 8-foot 2×4 contains 5.33 board feet using nominal dimensions (2 × 4 × 96 ÷ 144). For quick reference on common 8-foot dimensional lumber: a 2×6 contains 8 BF, a 2×8 contains 10.67 BF, a 2×10 contains 13.33 BF, a 2×12 contains 16 BF, and a 4×4 contains 10.67 BF. Most softwood dimensional lumber is sold per piece rather than per board foot, but knowing the BF count helps when comparing prices across sizes or converting wholesale quotes (which are usually in MBF) to retail equivalents.

MBF stands for “thousand board feet” (the M is the Roman numeral for 1,000) and is the standard unit for commercial lumber pricing, sawmill orders, and large construction bids. 1 MBF = 1,000 board feet. A wholesale price quoted as “$650/MBF” works out to $0.65 per board foot. Contractors buying full truckloads, bidding large framing packages, or sourcing direct from sawmills will typically see prices quoted in MBF; small-scale buyers see per-piece or per-board-foot pricing. Know the conversion to compare retail and wholesale pricing fairly.

Yes, both are measured in board feet, but pricing conventions differ. Hardwoods are almost always priced per board foot because widths and lengths vary piece to piece. Softwoods are typically priced per piece or per linear foot for standard dimensional lumber (2x4s, 2x6s), though softwood timbers, beams, posts, and rough-cut specialty pieces are usually priced per board foot. When comparing prices across formats — for example, a 2×12 quoted per piece vs. rough Doug fir quoted per BF — convert everything to per-board-foot to make a fair comparison.

For irregular slabs, measure the average width by adding the widest and narrowest points and dividing by 2, then apply the standard board foot formula using that average. For example, a 96″-long slab that’s 18″ wide at one end and 12″ at the other has an average width of 15″, and at 2″ thick: (1 × 96 × 15 × 2) ÷ 144 = 20 BF. Some sawmills round up to the next inch on width when measuring live-edge stock, which slightly favors the seller — confirm the measurement method with your supplier before agreeing to price, especially on high-value species.