Wall Framing Stud Calculator
Estimate studs, plate or track lineal length, and total stud material for a timber or steel stud-framed wall from its length, height, stud spacing, corners, and openings.
Studs include 8 extra for corners and openings plus the 10% waste allowance. Size headers, cripples, and bracing from the framing drawing.
How this works
Field studs come from the wall length and spacing; corners and openings add framing studs:
field studs = ceil(length / spacing) + 1
extras = corners × 2 + openings × 2
studs = ceil((field + extras) × (1 + waste%))
plate = length × plate layers × (1 + waste%)
stud lineal = studs × wall heightThe two-studs-per-opening allowance covers a king and a jack stud; headers, cripples, and blocking are taken off the drawing separately.
Worked example
A 6 m wall, 2.7 m high, at 406 mm centres with 2 corners, 2 openings, a double top plate, 10% waste:
- field =
ceil(6 / 0.406) + 1= 16; extras =2×2 + 2×2= 8 - studs =
ceil(24 × 1.10)= 27 - plate =
6 × 3 × 1.10≈ 19.8 m; stud material =27 × 2.7≈ 72.9 m
Sources
- Framing rules of thumb; stud spacing, header, and bracing requirements are set by local building codes (e.g. IRC, NCC, Eurocode) and the truss/stud manufacturer.
FAQ
How do I calculate how many studs I need for a wall?
Divide the wall length by the stud spacing and add one for the end stud. A 6 m wall at 400 mm (16 in) centres needs about 6 / 0.4 = 15, plus 1, so 16 field studs. Then add extra studs for each corner and each opening, because those need king and jack (trimmer) studs. This calculator adds two studs per corner and two per opening as a planning allowance and rounds the total up with a waste margin.
Should studs be 16 or 24 inches on centre?
Wood-framed load-bearing walls are commonly framed at 400 mm (16 in) on centre, which suits standard sheet materials and gives a stiff wall. Non-load-bearing partitions and some engineered systems use 600 mm (24 in) centres to save material. The correct spacing depends on the load, the wall height, the stud size, and your local building code — 'advanced framing' at 24 in centres, for example, requires specific detailing. Confirm the spacing before ordering.
How much plate material do I need?
Plates are the horizontal members at the top and bottom of the wall. A typical wood wall has a single bottom plate and a double top plate, so you need about three times the wall length in plate material. Select two layers for a single top plate (partitions) or three for a double top plate (load-bearing walls). This calculator multiplies the wall length by the number of plate layers and adds the waste allowance.
Does this include headers, cripples, and blocking?
No. The two-studs-per-opening allowance covers a king and a jack stud on one side of a simple opening. It does not size the header (lintel) over each opening, the cripple studs above and below openings, mid-height blocking or noggings, or bracing. Take those off the framing drawing separately, because header size in particular is a structural item that depends on the span and the load above.
Can I use this for steel stud (light-gauge) framing?
Yes for the geometry — the count of vertical studs and the length of track (the steel equivalent of plates) follow the same length-divided-by-spacing logic. However, light-gauge steel framing uses track instead of plates (usually a single top and bottom track, so two layers), and connections, bracing, and stud gauge are governed by the steel framing manufacturer's tables. Set the plate layers to two and treat the plate figure as top and bottom track.
How do I turn the stud count into boards to buy?
Studs are usually sold in standard lengths (for example 2.4 m, 3.0 m, or 8 ft and 92-5/8 in precut studs). If your wall height matches a stud length, the stud count is the number of pieces to buy. If you are cutting studs from longer lengths, divide the total stud lineal metres shown here by the length of the boards you buy and round up. Always buy a few spares for miscuts and warped pieces.