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Wall Framing Calculator
Estimates the lumber for one stud wall: studs from the wall length and spacing plus an end stud, two extra studs per three-stud corner and two per opening (jack studs beside the king studs), a waste allowance, plate length for a single bottom and double top plate, header count and 4 × 8 ft sheathing sheets. Planning estimate only.
When to use
You need a lumber take-off (studs, plates, sheathing) for a timber-framed wall of known length at 16 in, 24 in, 400 mm or 600 mm stud spacing.
Do not use when: You need structural sizing of headers or studs (species, grade and load dependent; see the IRC chapter 6 tables), drywall for the finished wall (use drywall) or board footage for pricing (use board-feet).
Formula
studs_before_waste = ceil(wall_length / stud_spacing) + 1 + 2 × corners + 2 × openings; studs = ceil(studs_before_waste × (1 + waste_percent/100)); plate_linear_ft = 3 × wall_length_ft; plate_pieces = ceil(plate_linear_ft / plate_length_ft); headers = openings; sheathing_sheets_4x8 = ceil(wall_length_ft × wall_height_ft / 32).
Assumes platform framing with a single bottom plate and a double top plate, three-stud corners and a king plus jack stud each side of every opening; blocking, fire stops, sills, cripples and nails are not counted. Planning estimate only; check quantities against the supplier's coverage figures and local code before ordering.
Inputs
| Parameter | Type | Unit | Required | Description |
|---|---|---|---|---|
wall_length | number | ft or m | yes | Length of the wall in feet or metres (see length_unit). Range: > 0, ≤ 1000 |
length_unit | enum: m | ft | default ft | Unit of the length inputs (m or ft). Lengths are reported in both units. | |
stud_spacing | enum: 16_in | 24_in | 400_mm | 600_mm | default 16_in | Centre-to-centre stud spacing: 16 in (400 mm) is standard for load-bearing walls; 24 in (600 mm) is allowed for many non-bearing and advanced-framing walls. | |
corners | integer | default 2 | Wall corners or partition intersections framed with three studs; 2 extra studs are added per corner. Range: ≥ 0, ≤ 50 | |
openings | integer | default 0 | Doors and windows in the wall; each adds 2 studs (jack studs beside the king studs; cripples are cut from offcuts) and one header. Range: ≥ 0, ≤ 100 | |
wall_height_ft | number | ft | default 8 | Wall height in feet (2.4 m ≈ 7.87 ft); used only for the sheathing count. Range: > 0, ≤ 30 |
waste_percent | number | % | default 10 | Extra material for cuts, breakage and offcuts, applied as a multiplier (1 + waste_percent/100). 10 % covers crooked or split studs and cripples cut from full lengths. Range: ≥ 0, ≤ 50 |
plate_length_ft | number | ft | default 8 | Length of the plate lumber you will buy, in feet (8, 10, 12, 14 or 16 ft stock; 4.8 m ≈ 15.75 ft). Range: > 0, ≤ 40 |
Outputs
| Output | Type | Unit | Description |
|---|---|---|---|
studs_before_waste | integer | ceil(wall_length / spacing) + 1 + 2 × corners + 2 × openings. | |
studs | integer | ceil(studs_before_waste × (1 + waste_percent/100)). | |
plate_linear_ft | number | ft | 3 × wall_length (single bottom plate + double top plate). |
plate_linear_m | number | m | Same plate length in metres. |
plate_pieces | integer | ceil(plate_linear_ft / plate_length_ft). | |
headers | integer | One header per opening (size from the code span tables). | |
sheathing_sheets_4x8 | integer | ceil(wall_length_ft × wall_height_ft / 32). | |
wall_area_ft2 | number | ft² | wall_length_ft × wall_height_ft. |
Example
20 ft wall, 16 in OC, 2 corners, 1 opening, 10 % waste, 8 ft plates: {"wall_length":20,"length_unit":"ft","stud_spacing":"16_in","corners":2,"openings":1,"wall_height_ft":8,"waste_percent":10,"plate_length_ft":8} → {"studs_before_waste":22,"studs":25,"plate_linear_ft":60,"plate_linear_m":18.29,"plate_pieces":8,"headers":1,"sheathing_sheets_4x8":5}
6 m wall, 600 mm OC, 2 corners, 2 openings, 10 % waste: {"wall_length":6,"length_unit":"m","stud_spacing":"600_mm","corners":2,"openings":2,"waste_percent":10} → {"studs_before_waste":19,"studs":21,"plate_linear_m":18,"plate_linear_ft":59.06,"plate_pieces":8,"headers":2,"sheathing_sheets_4x8":5}
GET https://tttkmbb.com/api/v1/calculate/wall-framing-studs?wall_length=20&length_unit=ft&stud_spacing=16_in&corners=2&openings=1&wall_height_ft=8&waste_percent=10&plate_length_ft=8
Machine access
- API:
GET https://tttkmbb.com/api/v1/calculate/wall-framing-studs(query parameters) orPOSTwith a JSON body{"inputs": {...}} - Schema: https://tttkmbb.com/api/v1/calculators/wall-framing-studs · Markdown: https://tttkmbb.com/construction/wall-framing-studs.md · JSON definition: https://tttkmbb.com/construction/wall-framing-studs.json
- MCP: server
https://tttkmbb.com/mcp, toolrun_calculator with calculator_id="wall-framing-studs" - OpenAPI operationId:
estimate_wall_framing - Freshness:
static. Authentication: none. Rate limit: fair use (see rate limits).
Sources
FAQ
Why add one stud to the spacing count?
Studs sit at every spacing interval plus one at the far end: a 20 ft wall at 16 in has 15 intervals and 16 layout studs. Corners and openings then add their extra studs.
How are openings counted?
Each opening is framed with a king stud and a jack (trimmer) stud on both sides. The king studs replace layout studs, so 2 studs per opening are added; cripples above and below come from offcuts and the waste allowance.
Does this size the header?
No. Header depth depends on span, load and species (IRC R602.7 tables); the count only tells you how many headers to build.
Related calculators
- Drywall Calculator — Board the finished wall.
- Board Feet Calculator — Convert the lumber list to board feet for pricing.
- Decking Calculator — Joist counts for a deck frame.