Calculate board feet and optional cost with quantity, unit conversion, and wastage allowances.
How this calculator works
A board foot is a volume measure: 1 inch thick × 12 inches wide × 1 foot long.
board_feet_each = (thickness_in × width_in × length_ft) ÷ 12board_feet_total = board_feet_each × quantity × (1 + wastage%)boards_to_buy = ceil( quantity × (1 + wastage%) )
- Hardwood is sold by the board foot; dimensional softwood is usually sold by the piece — pick the matching pricing mode.
- Use nominal thickness (e.g., 1″ for a "5/4" board) — that is what board-foot pricing assumes.
Common questions
What is a board foot?
A board foot is the volume of a piece of lumber 1″ thick × 12″ wide × 1 ft long — 144 cubic inches. Hardwood is almost always priced this way. Dimensional softwood (2×4s, 2×6s) is priced per piece.
Should I use nominal or actual lumber dimensions?
Nominal. A "2×4" measures 1.5″ × 3.5″ actual, but board-foot pricing uses 2 × 4. Hardwood is quoted in "quarters" (4/4 = 1″, 5/4 = 1.25″) which are nominal — use those.
How much wastage for hardwood?
10% covers most rough cuts. Bump to 15–20% when you need clear stock with no defects, when the cut list has lots of short pieces, or when you're working with figured/specialty wood that's more expensive to re-order.
Framing lumber is sold by the piece and billed by the board foot, and the difference is where short orders happen. Miss the rim plates, miss a couple of king studs at the openings, miss the doubled corners and you’re sending someone for a Home Depot run while the rest of the crew waits with nail guns idle. This calculator returns a stud count for the wall you described — including the plates, the openings, and the corners — plus board-foot equivalents so the supplier’s quote and your takeoff agree.
What you’ll get
Enter wall length, ceiling height, stud spacing (16 or 24 inch on-centre), and board length (8, 10, 12 ft). The calculator returns line studs, top and bottom plates, opening framing, board-foot total, and an estimated cost if you supply a per-board or per-board-foot rate.
A sample wall
Say you’re framing a 12 ft wall at 16 inch on-centre, 8 ft ceiling, no openings. Line studs come from the wall length divided by spacing, plus one for the end:
Add the doubled-end corner stud and the plates — top, bottom, and the cap that ties one wall into the next:
Each opening adds two king studs, two jack studs, a header, and a sill — roughly 6 extra pieces per window or door. A wall with one window comes out around 23 pieces. The supplier prices these at the per-piece rate; the bill of materials uses board feet, which for 8 ft 2×4s comes out to 5.33 BF per piece.
Spacing, and where the defaults come from
16 inch on-centre is the residential framing standard for load-bearing walls in Ontario and most of North America. 24 inch on-centre (advanced framing) is allowed for non-loadbearing partitions and saves about 30% of the line-stud count, but the drywall has to span the wider gap and your nailer crew may push back. 12 inch spacing shows up only in shear walls and hurricane regions — if your engineer hasn’t asked for it, you don’t need it.
When to lean on it, when not to
This is a single straight-wall calculator. It handles individual partition runs, garage walls, and the long walls of a rectangular addition. It is not the right tool for full house framing takeoffs, walls with more than three openings, gable ends, or anything where engineered lumber, jack-rafters, or trusses interact with the wall plates. For those, hand the plans to your supplier — most lumber yards offer a free framing takeoff for orders over a threshold.
Board foot = thickness × width × length, all in inches, divided by 144. So an 8 ft 2×4 = 1.5 × 3.5 × 96 ÷ 144 ≈ 5.3 BF. Nailers, hangers, fasteners, and waste are not in the calculator — figure 5% extra studs for splits and crooked pieces.
If you’re framing anything that touches a building permit, structural engineering, or an addition that ties into existing framing, a sit-down with a contractor or framer who can read the plans is usually cheaper than reordering after a permit revision.
Other calculators on this site
If you’re scoping a whole project, you’ll usually need more than one of these. They share the same approach — plain math, honest about edge cases, with the practical notes someone who has done the work would actually need.
- Asphalt Calculator. Tonnage for a driveway, parking patch, or walkway pour, including the depth-to-tonnage curve a supplier will quote against.
- Concrete Pour Calculator. Cubic yards of concrete for a slab, footing, or post hole, plus the waste factor most pours actually need.
- Drywall Calculator. Sheets of drywall and bundles of mud for a renovation room, plus the cut and waste allowance.
- Excavation Calculator. Cubic yards of dirt to remove for a basement, pool, or footing — including the bulking factor that surprises first-timers.
- Fence Calculator. Lineal feet of fence, post count, rails, and gates for a property line that is rarely perfectly straight.
- Fill Calculator. Cubic yards of fill for a regrade, a backyard level, or a low spot, plus a sensible compaction factor.
- Paint Calculator. Gallons of paint for a room, plus the coverage difference between primed and unprimed surfaces.
- Tile Calculator. Square footage of tile for a floor or wall, plus the breakage and cut waste a real installation needs.
Rate And Review This Content
Be the first to rate this. Submissions are reviewed before they appear.