{"success":true,"version":"v1","request":{"tool":"get_calculator_schema","calculator_id":"wall-framing-studs"},"result":{"entity_type":"calculator","id":"wall-framing-studs","calculator_id":"wall-framing-studs","canonical_url":"https://tttkmbb.com/construction/wall-framing-studs","name":"Wall Framing Calculator","title":"Wall Framing Calculator – Studs, Plates, Headers and Sheathing for a Stud Wall at 16 or 24 in on Centre","category":"construction","category_name":"Construction & Home","tool_name":"estimate_wall_framing","featured_mcp_tool":false,"description":"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.","use_when":"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).","inputs":[{"name":"wall_length","label":"Wall length","type":"number","unit":"ft or m","required":true,"max":1000,"exclusive_min":0,"description":"Length of the wall in feet or metres (see length_unit).","example":20},{"name":"length_unit","label":"Length unit","type":"enum","required":false,"default":"ft","values":[{"value":"m","label":"Metres (m)","aliases":["metre","meter","metres","meters","metric"]},{"value":"ft","label":"Feet (ft)","aliases":["feet","foot","imperial"]}],"description":"Unit of the length inputs (m or ft). Lengths are reported in both units.","example":"ft"},{"name":"stud_spacing","label":"Stud spacing","type":"enum","required":false,"default":"16_in","values":[{"value":"16_in","label":"16 in on centre","aliases":["16","16in","16 oc"]},{"value":"24_in","label":"24 in on centre","aliases":["24","24in","24 oc"]},{"value":"400_mm","label":"400 mm on centre","aliases":["400","400mm"]},{"value":"600_mm","label":"600 mm on centre","aliases":["600","600mm"]}],"description":"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.","example":"16_in"},{"name":"corners","label":"Corners and intersections","type":"integer","required":false,"default":2,"min":0,"max":50,"description":"Wall corners or partition intersections framed with three studs; 2 extra studs are added per corner.","example":2},{"name":"openings","label":"Openings","type":"integer","required":false,"default":0,"min":0,"max":100,"description":"Doors and windows in the wall; each adds 2 studs (jack studs beside the king studs; cripples are cut from offcuts) and one header.","example":1},{"name":"wall_height_ft","label":"Wall height","type":"number","unit":"ft","required":false,"default":8,"max":30,"exclusive_min":0,"description":"Wall height in feet (2.4 m ≈ 7.87 ft); used only for the sheathing count.","example":8},{"name":"waste_percent","label":"Waste allowance","type":"number","unit":"%","required":false,"default":10,"min":0,"max":50,"description":"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.","example":10},{"name":"plate_length_ft","label":"Plate stock length","type":"number","unit":"ft","required":false,"default":8,"max":40,"exclusive_min":0,"description":"Length of the plate lumber you will buy, in feet (8, 10, 12, 14 or 16 ft stock; 4.8 m ≈ 15.75 ft).","example":8}],"outputs":[{"name":"studs_before_waste","label":"Studs (layout)","type":"integer","decimals":4,"description":"ceil(wall_length / spacing) + 1 + 2 × corners + 2 × openings."},{"name":"studs","label":"Studs to buy","type":"integer","decimals":4,"description":"ceil(studs_before_waste × (1 + waste_percent/100))."},{"name":"plate_linear_ft","label":"Plate lumber","type":"number","unit":"ft","decimals":1,"description":"3 × wall_length (single bottom plate + double top plate)."},{"name":"plate_linear_m","label":"Plate lumber","type":"number","unit":"m","decimals":2,"description":"Same plate length in metres."},{"name":"plate_pieces","label":"Plate pieces","type":"integer","decimals":4,"description":"ceil(plate_linear_ft / plate_length_ft)."},{"name":"headers","label":"Headers","type":"integer","decimals":4,"description":"One header per opening (size from the code span tables)."},{"name":"sheathing_sheets_4x8","label":"Sheathing sheets (4 × 8 ft)","type":"integer","decimals":4,"description":"ceil(wall_length_ft × wall_height_ft / 32)."},{"name":"wall_area_ft2","label":"Wall area","type":"number","unit":"ft²","decimals":1,"description":"wall_length_ft × wall_height_ft."}],"input_schema":{"type":"object","properties":{"wall_length":{"description":"Length of the wall in feet or metres (see length_unit). Unit: ft or m.","type":"number","maximum":1000,"exclusiveMinimum":0,"examples":[20],"x-unit":"ft or m"},"length_unit":{"description":"Unit of the length inputs (m or ft). Lengths are reported in both units.","type":"string","enum":["m","ft"],"default":"ft","examples":["ft"]},"stud_spacing":{"description":"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.","type":"string","enum":["16_in","24_in","400_mm","600_mm"],"default":"16_in","examples":["16_in"]},"corners":{"description":"Wall corners or partition intersections framed with three studs; 2 extra studs are added per corner.","type":"integer","minimum":0,"maximum":50,"default":2,"examples":[2]},"openings":{"description":"Doors and windows in the wall; each adds 2 studs (jack studs beside the king studs; cripples are cut from offcuts) and one header.","type":"integer","minimum":0,"maximum":100,"default":0,"examples":[1]},"wall_height_ft":{"description":"Wall height in feet (2.4 m ≈ 7.87 ft); used only for the sheathing count. Unit: ft.","type":"number","maximum":30,"exclusiveMinimum":0,"default":8,"examples":[8],"x-unit":"ft"},"waste_percent":{"description":"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. Unit: %.","type":"number","minimum":0,"maximum":50,"default":10,"examples":[10],"x-unit":"%"},"plate_length_ft":{"description":"Length of the plate lumber you will buy, in feet (8, 10, 12, 14 or 16 ft stock; 4.8 m ≈ 15.75 ft). Unit: ft.","type":"number","maximum":40,"exclusiveMinimum":0,"default":8,"examples":[8],"x-unit":"ft"}},"additionalProperties":false,"required":["wall_length"]},"output_schema":{"type":"object","properties":{"studs_before_waste":{"description":"ceil(wall_length / spacing) + 1 + 2 × corners + 2 × openings.","type":"integer"},"studs":{"description":"ceil(studs_before_waste × (1 + waste_percent/100)).","type":"integer"},"plate_linear_ft":{"description":"3 × wall_length (single bottom plate + double top plate). Unit: ft.","type":"number","x-unit":"ft"},"plate_linear_m":{"description":"Same plate length in metres. Unit: m.","type":"number","x-unit":"m"},"plate_pieces":{"description":"ceil(plate_linear_ft / plate_length_ft).","type":"integer"},"headers":{"description":"One header per opening (size from the code span tables).","type":"integer"},"sheathing_sheets_4x8":{"description":"ceil(wall_length_ft × wall_height_ft / 32).","type":"integer"},"wall_area_ft2":{"description":"wall_length_ft × wall_height_ft. Unit: ft².","type":"number","x-unit":"ft²"}}},"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).","method":"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.","sources":[{"name":"Wikipedia – Wall stud","url":"https://en.wikipedia.org/wiki/Wall_stud","type":"reference","retrieved_at":"2026-09-24"},{"name":"ICC – 2021 International Residential Code, Chapter 6 Wall Construction (R602.3 stud spacing, R602.7 headers)","url":"https://codes.iccsafe.org/content/IRC2021P2/chapter-6-wall-construction","type":"standard","retrieved_at":"2026-09-24"}],"freshness":{"type":"static","max_age_seconds":null,"note":"Deterministic formula with fixed constants; results never go stale. Inputs supplied by the caller determine the output."},"examples":[{"name":"20 ft wall, 16 in OC, 2 corners, 1 opening, 10 % waste, 8 ft plates","inputs":{"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},"expected":{"studs_before_waste":22,"studs":25,"plate_linear_ft":60,"plate_linear_m":18.29,"plate_pieces":8,"headers":1,"sheathing_sheets_4x8":5},"url":"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"},{"name":"6 m wall, 600 mm OC, 2 corners, 2 openings, 10 % waste","inputs":{"wall_length":6,"length_unit":"m","stud_spacing":"600_mm","corners":2,"openings":2,"waste_percent":10},"expected":{"studs_before_waste":19,"studs":21,"plate_linear_m":18,"plate_linear_ft":59.06,"plate_pieces":8,"headers":2,"sheathing_sheets_4x8":5},"url":"https://tttkmbb.com/api/v1/calculate/wall-framing-studs?wall_length=6&length_unit=m&stud_spacing=600_mm&corners=2&openings=2&waste_percent=10"}],"faq":[{"q":"Why add one stud to the spacing count?","a":"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."},{"q":"How are openings counted?","a":"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."},{"q":"Does this size the header?","a":"No. Header depth depends on span, load and species (IRC R602.7 tables); the count only tells you how many headers to build."}],"tags":["wall framing calculator","how many studs","stud calculator","16 inch on center","top plate","wall sheathing"],"related":[{"calculator_id":"drywall","reason":"Board the finished wall."},{"calculator_id":"board-feet","reason":"Convert the lumber list to board feet for pricing."},{"calculator_id":"decking","reason":"Joist counts for a deck frame."}],"links":{"html":"https://tttkmbb.com/construction/wall-framing-studs","markdown":"https://tttkmbb.com/construction/wall-framing-studs.md","json":"https://tttkmbb.com/construction/wall-framing-studs.json","api":"https://tttkmbb.com/api/v1/calculate/wall-framing-studs","schema":"https://tttkmbb.com/api/v1/calculators/wall-framing-studs","openapi":"https://tttkmbb.com/openapi.json","mcp":"https://tttkmbb.com/mcp"},"version":"v1","updated_at":"2026-09-24"},"timestamp":"2026-09-24T03:46:09Z","next_actions":[{"tool":"run_calculator","calculator_id":"wall-framing-studs","reason":"Run Wall Framing Calculator with the inputs above."}],"links":{"markdown":"https://tttkmbb.com/construction/wall-framing-studs.md"}}