Framing and carpentry
Stud calculator
A 40 ft exterior wall, 8 ft high in 2 × 4 at 16 in on center, with two corners, a wall join, a door and three windows, takes 53 studs — more than the one per foot framers reckon on a plain wall, because of the openings — 12 plates of 12 ft, headers and sheathing: $570 of lumber, $1,530 framed. Change the spacing, the size or the openings and every piece is recounted.
Written and edited by Pablo Ruiz Quintero
Last reviewed 2026-09-30 · Nothing you type leaves your browser
Stud and wall framing calculator
The wall, the spacing and the openings
Studs are counted the way a framer counts them: one every 16 in along the wall, plus the ones corners, wall intersections, doors and windows take.
Double top plate, a real header over every opening, and sheathing on the outside.
All the walls added up.
Interior walls and most one- and two-storey exterior walls in mild climates.
A framing crew.
Used only to pick a regional labour rate. It stays in your browser.
40 ft of 2 × 4 wall at 16 in
53 studs
12 plates of 12 ft · 10% waste included
$1,530 framed
$4.78 a square foot of wall · $38.24 a foot of wall
The rule of thumb
About one stud per foot, plus the openings.
On a plain wall at 16 in centers, a stud per linear foot is the quick check framers use; corners, joins and every door and window add to it. This wall is 1.32 a foot.
12, 16 or 24 inches on center
40 ft of exterior, load-bearing wall, 8 ft high.
Lumber list
- 2 × 4 studs, 92-5/8 in precut
31 on 16 in centers along 40 ft, plus 17 for corners, wall intersections and the kings, jacks and cripples at openings, and 10% for crooked ones.53 studs · $239 - 2 × 4 × 12 ft top plates
A doubled top plate, lapped at corners and intersections.8 boards · $64 - 2 × 4 × 12 ft bottom plate
Nailed to the subfloor through to the joists.4 boards · $32 - Headers, two plies of 2 × 6
One over each of 4 openings, 3 in longer than the opening to sit on the jack studs.26 lin ft · $31 - 7/16 in OSB sheathing
4 × 8 ft sheets on the outside face, the openings cut out after.9 sheets · $180 - Nails, pins and connectors
Framing nails, and pins or screws into concrete for a basement plate.40 lin ft · $24 - Framing crew
Laying out, building, standing and bracing 320 sq ft of wall.$960
What it costs
National average. 40 ft of 8 ft exterior, load-bearing wall in 2 × 4 at 16 in, with its plates and headers and sheathing. Not included: insulation, drywall, electrical, a permit.
Then the drywall and the insulation; lumber by the board foot, on the board foot calculator.
Worth knowing
- 53 studs for 40 ft of wall — 1.32 a foot. The framer's quick check is one stud per foot at 16 in centers on a plain wall; every corner, join and opening pushes it up, which is why a wall full of windows comes out well above one.
- The header sizes here are the usual rule for a one-storey bearing wall. A second floor, a girder or snow load above changes them: the code's header tables, or the lumber yard's engineer, decide.
On this page — 4 sections
Counting studs like a framer
The short version
- 40 ft at 16 in: 53 studs, with two corners, a join, a door and three windows.
- About one stud per foot on a plain wall; openings add more.
- Framed: $4.78 a square foot of wall.
- 24 in saves studs, not money.
studs = (length × 12 ÷ spacing + 1 + 2·corners + 2·joins + 2·doors + 3·windows) × 1.1
The field count is one stud every 16 in and one to finish. Corners take extra studs so the drywall has something to land on inside; a wall joining another takes a pair or a ladder of blocking; a door takes jack studs under its header; a window takes jacks and the cripples under its sill. Then 10% more, because some studs arrive crooked.
| Quantity | Cost | |
|---|---|---|
| 2 × 4 studs, 92-5/8 in precut | 53 studs | $239 |
| 2 × 4 × 12 ft top plates | 8 boards | $64 |
| 2 × 4 × 12 ft bottom plate | 4 boards | $32 |
| Headers, two plies of 2 × 6 | 26 lin ft | $31 |
| 7/16 in OSB sheathing | 9 sheets | $180 |
| Nails, pins and connectors | 40 lin ft | $24 |
53
Studs
40 ft wall
12
Plates
12 ft boards
$570
Lumber
With sheathing
$1,530
Framed
Hired
MaterialsEstimator, Wall framing takeoff and price survey · checked 2026-09-30
Spacing and stud size
| Studs | Framed | |
|---|---|---|
| 12 in on center | 64 | $1,579 |
| 16 in on center | 53 | $1,530 |
| 24 in on center | 42 | $1,480 |
| 2 × 6 at 16 in | 53 | $1,775 |
The building code sets stud size and spacing by what the wall carries and how tall it is: 2 × 4 at 16 in for most bearing walls, 24 in where it carries only a roof and ceiling or nothing at all. 2 × 6 walls are for insulation depth and plumbing more often than for strength.
International Code Council, International Residential Code, Section R602, Wood wall framing · checked 2026-09-16
Headers over openings
| Two plies of | Per foot | |
|---|---|---|
| Opening up to 3 ft | 2 × 6 | $1.20 |
| Opening up to 4 ft | 2 × 8 | $1.60 |
| Opening up to 5 ft | 2 × 10 | $2.10 |
| Opening up to 6 ft | 2 × 12 | $2.70 |
In a bearing wall every opening needs a header that carries the load above it to jack studs on each side. The sizes above are the framer’s rule for a one-storey wall; a floor, a girder or snow above changes them, and anything wider than 6 ft is an engineered beam. A non-bearing partition needs only a flat piece to nail to.
International Code Council, IRC R602.7 — Headers over openings in bearing walls (2021) · checked 2026-09-23
What goes wrong
Before ordering
- Every wall measured and added up.
- Corners, joins, doors and windows counted.
- Which walls are bearing.
- Wall height, for the right precut studs.
- Treated plates for anything on concrete.
01Forgetting corners and openings
They add a stud per foot's worth.
Instead — Count them, or use one stud per foot.
02Untreated plate on a slab
Concrete wicks moisture and the plate rots.
Instead — Pressure-treated bottom plate.
03A flat header in a bearing wall
It sags and the drywall above cracks.
Instead — A real header on jack studs.
04Framing tight to a basement wall
Moisture and no room for insulation.
Instead — An inch off, with foam first.
- 01Count the field studsLength in inches ÷ spacing, plus one.
- 02Add corners and wall joins2 extra for each corner and 2 for each place another wall meets it.
- 03Add the openings2 for each door and 3 for each window: jacks and cripples.
- 04Add waste10% for crooked and split studs.
- 05Count the platesWall length × 3 (bottom and double top), in 12 ft boards.
- 06Size the headersTwo plies over each opening in a bearing wall.
Sheets, mud and tape for the walls you just framed.
Then the drywall- On center (OC)
- The distance from the middle of one stud to the middle of the next: 16 in is standard, 24 in saves studs, 12 in is for tall or heavy walls.
- Precut stud
- A stud cut to 92-5/8 in so an 8 ft wall with a bottom plate and a double top plate comes to 97-1/8 in — room for a sheet of drywall and a gap.
- Top plate
- The horizontal member on top of the studs, doubled on a bearing wall and lapped at corners to tie the walls together.
- Bottom plate
- The horizontal member under the studs; pressure-treated where it sits on concrete.
- King stud
- The full-height stud beside an opening.
- Jack stud
- The shorter stud inside the king that carries the header.
- Cripple
- A short stud above a header or below a window sill.
- Header
- The beam over a door or window in a bearing wall, carrying the load around the opening.
Common questions
- How many studs do I need?
- Divide the wall length in inches by the spacing, add one, then add 2 per corner, 2 per wall join, 2 per door and 3 per window, and 10%. A 40 ft wall at 16 in with two corners, a join, a door and three windows is 53 studs; a plain 10 ft wall is 10.
- How many studs per foot of wall?
- About one at 16 in on center on a plain wall — the framer's quick check: a 10 ft partition with no openings is 10. Corners and openings push it up: the 40 ft wall here, with a door and three windows, comes to 1.32 a foot, and 1.05 at 24 in.
- How much does framing cost per square foot?
- About $4.78 a square foot of wall for an exterior 2 × 4 wall with sheathing — $570 of lumber and $960 of labour for 320 sq ft — and $4.36 for an interior partition. The crew is about $3 a square foot of wall; framing it yourself is the lumber alone, $570, and about 13 hours.
- How much does it cost to frame a basement?
- About $3,696 for 120 ft of 8 ft wall against the foundation — treated bottom plate, 2 × 4 at 16 in, a door — or $816 in lumber if you frame it yourself. Insulation and drywall come after.
- How much does it cost to frame an interior wall?
- About $418 for a 12 ft partition with a door, 8 ft high: 18 studs, plates and a flat header, framed.
- Should I frame at 16 or 24 inches on center?
- 16 in is standard and required for most bearing 2 × 4 walls with a floor above. 24 in saves studs — 42 instead of 53 here — but little money ($1,480 against $1,530), because plates, headers, sheathing and labour do not change.
- 2 × 4 or 2 × 6 studs?
- 2 × 6 for exterior walls in cold climates, so the cavity takes R-20 insulation, and for plumbing walls. The same 40 ft wall is $1,775 in 2 × 6 against $1,530 in 2 × 4.
- What size header do I need?
- As a rule of thumb for a one-storey bearing wall, two plies of 2 × 6 up to 3 ft, 2 × 8 up to 4 ft, 2 × 10 up to 5 ft, 2 × 12 up to 6 ft; past 6 ft, engineered lumber. A floor or a girder above changes that — the code's header tables or the lumber yard's engineer decide.
- How long are studs for a 9 or 10 ft wall?
- 92-5/8 in for 8 ft, 104-5/8 in for 9 ft, 116-5/8 in for 10 ft — precut so the finished wall height with a bottom plate and a double top plate suits full drywall sheets.
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About the author
Pablo Ruiz Quintero — Editor
Editor of MaterialsEstimator. Decides which documents count as a source, what every default value is, and where the line sits between what the reader parses and what the engines compute.
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