Wall Framing Calculator

How much lumber does your wall actually need? Enter wall length (or building perimeter), pick height and stud spacing, add your openings — get a full lumber takeoff with waste factor and cost. Based on typical Canadian platform-framing practice with editable prices.

Walls

Total wall length (ft)

For a full building, use the perimeter — e.g., 24×30 garage = 108 ft.

Wall height

Stud spacing

Stud size

Corners

Each corner adds 2 extra studs (3-stud corner).

Windows

Man doors

Garage doors

Big headers are typically engineered (LVL) — priced separately below.

Waste / cutoff factor

Plan your cut list before ordering — it's the cheapest way to shrink this number.

Include wall sheathing?

Adjust lumber prices (CAD, editable)

Price per stud ($)

Auto-set from size/height — override with your local price.

Plate stock, 16 ft ($/pc)

Header lumber ($/lin ft)

Doubled 2×10 equivalent for windows/man doors.

LVL / engineered header ($/lin ft)

Garage door headers; confirm size with supplier/engineer.

Sheathing ($/4×8 sheet)

Lumber package (incl. waste)

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Lumber Takeoff

Item	Quantity	Cost

Disclaimer: This calculator estimates lumber using typical Canadian platform-framing practice (single bottom plate, double top plate, 3-stud corners, standard opening framing). It is a planning takeoff, not a code-compliant design — stud size/spacing limits, header sizing, point loads, and bracing requirements are set by your provincial building code and your permit drawings. Garage door and long-span headers usually require engineered sizing. Confirm the final design with your building department and, where required, an engineer or truss/beam supplier.

How this estimate works

Studs = wall length ÷ spacing + 1, plus 2 extra per corner, plus opening framing: each window adds ~7 (kings, jacks, cripples), each man door ~5, each garage door ~8 (jack/king posts each side). Plates = 3 runs of wall length (single bottom + double top) in 16-ft stock. Headers: ~5 lin ft of doubled header stock per window, ~4 per man door, and ~11 lin ft of engineered (LVL) stock per garage door. Sheathing = wall area ÷ 32 sq ft per sheet, openings ignored (offcuts rarely survive reuse). Everything is then multiplied by your waste factor — and see our garage cost guide for what framing means in the full project budget.

What drives the takeoff

Openings cost far more framing than their size implies. A window isn't a hole where studs used to be — it's a king stud and jack stud each side, a doubled header, and a row of cripples above and below. That's roughly seven extra pieces where you removed one or two. A garage door is worse: wide spans need engineered header stock, and the point loads at each end need solid posts down to the plate. This is why two buildings with identical wall length can have very different lumber lists, and why "add another window" is never free.

Stud spacing is a real cost lever with real trade-offs. Moving from 16" to 24" on centre removes roughly a third of the studs. It's permitted for many single-storey applications and standard in some regions, but it changes sheathing stiffness, what the wall can carry, and how drywall behaves — 24" spacing generally wants thicker drywall to avoid visible waviness. Decide it against the structure, not the material bill.

Waste factor is not padding. Lumber comes in fixed lengths, walls don't, and every cut leaves an offcut that's usually too short to use. Plate stock in 16-ft lengths on a 22-ft wall wastes real material. A 10% allowance is a reasonable default for a straightforward rectangular building; complex layouts, many openings, or an inexperienced crew justify more. Running short mid-build costs a second delivery trip and a day. Our guide to cutoffs and waste budgeting covers how to set the number honestly.

Sheathing counts sheets, not area. The tool deliberately ignores openings when counting sheets, because the piece you cut out of a sheet for a window rarely survives as a usable piece elsewhere. Counting the theoretical area instead of whole sheets is the classic way to under-order.

Lumber grade and species change the price without changing the count. The takeoff here tells you how many pieces of what length. What you pay per piece depends on species, grade, and whether it's pressure-treated — and PT is mandatory for the bottom plate on concrete. See Lumber Choices for Construction for what to specify where.

What this takeoff does not include

This is a wall-framing material list. A framed shell needs considerably more than walls:

Labour. The largest cost in most framing jobs and entirely absent here. Material lists and installed prices are different numbers.
Fasteners, hangers, and hardware — nails, structural screws, hurricane ties, anchor bolts, and hold-downs. Individually cheap, collectively a real line, and code-specified in many locations.
The roof and floor. Price those with the Roof Cost Estimator and Foundation Estimator.
The building envelope beyond sheathing: housewrap or WRB, flashing, siding, soffit and fascia, windows and doors themselves. A framed and sheathed wall is not a weatherproof wall.
Insulation, vapour barrier, and drywall.
Engineered members beyond the simple LVL allowance for garage-door headers. Long spans, point loads, or anything outside prescriptive code tables need sizing by an engineer, not by a calculator.
Bracing and temporary work during construction, and the equipment to stand walls if they're too heavy to lift by hand.
Delivery and any minimum-order charges from the yard.

Take this list to a lumber yard for pricing rather than treating it as a budget. Yards will also flag substitutions and stock lengths that change the count.