[{"data":1,"prerenderedAt":120},["ShallowReactive",2],{"pages:en":3,"type:en:wood-l-winder":89},{"home":4,"types":8},{"title":5,"description":6,"h1":7},"Free 3D Stair Calculator with DXF Drawings | StairGen Pro","Free stair calculator for 16 stair types: steel, wood, spiral and concrete. Rise, run, stringers, comfort and code check, live 3D and DXF for AutoCAD.","Stair Calculator with 3D Model and DXF Shop Drawings",{"metal-straight":9,"metal-straight-toothed":14,"metal-l":19,"metal-l-toothed":24,"metal-u":29,"metal-u-toothed":34,"spiral":39,"wood-straight":44,"wood-cut":49,"wood-l":54,"wood-l-winder":59,"wood-u":64,"wood-u-winder":69,"wood-three":74,"wood-three-winder":79,"concrete":84},{"slug":10,"title":11,"description":12,"h1":13},"steel-stair-calculator","Steel Stair Calculator: 3D Model & DXF Shop Drawings","Design a straight steel stair with stringer and tread brackets. Get rise, run, bracket spacing, cut list and fabrication drawings in DXF for AutoCAD.","Steel Stair Calculator with Fabrication Drawings",{"slug":15,"title":16,"description":17,"h1":18},"sawtooth-steel-stringer-stair-calculator","Sawtooth Steel Stringer Stair Calculator | 3D + DXF","Calculate a straight steel stair with sawtooth (cut) stringers: rise, run, stringer layout and plate cuts, with a live 3D model and DXF shop drawings.","Steel Stair Calculator with Sawtooth Stringers",{"slug":20,"title":21,"description":22,"h1":23},"l-shaped-steel-stair-calculator","L-Shaped Steel Stair Calculator with Landing | DXF","Quarter-turn steel stair with landing: split risers between flights, check comfort and slope, see it in 3D and download dimensioned DXF drawings.","L-Shaped Steel Stair Calculator with Landing",{"slug":25,"title":26,"description":27,"h1":28},"l-shaped-sawtooth-steel-stair-calculator","L-Shaped Steel Stair Calculator: Sawtooth Stringers","L-shaped steel stair with sawtooth stringers and a square landing. Rise, run, stringer cuts and bill of materials, with 3D view and DXF for AutoCAD.","L-Shaped Steel Stair with Sawtooth Stringers",{"slug":30,"title":31,"description":32,"h1":33},"u-shaped-steel-stair-calculator","U-Shaped Steel Stair Calculator | Switchback + DXF","Half-turn (switchback) steel stair with a full-width landing. Calculate both flights, check comfort and export fabrication drawings to DXF.","U-Shaped Steel Stair Calculator (Switchback)",{"slug":35,"title":36,"description":37,"h1":38},"u-shaped-sawtooth-steel-stair-calculator","U-Shaped Steel Stair Calculator: Sawtooth Stringers","Switchback steel stair with sawtooth stringers: flight split, landing size, stringer cuts and cut list, with live 3D and DXF shop drawings.","U-Shaped Steel Stair with Sawtooth Stringers",{"slug":40,"title":41,"description":42,"h1":43},"spiral-staircase-calculator","Spiral Staircase Calculator: 3D, Dimensions & DXF","Spiral stair calculator: number of steps, rise, tread angle and walkline going from height and diameter. Live 3D and DXF drawings, free.","Spiral Staircase Calculator",{"slug":45,"title":46,"description":47,"h1":48},"wooden-stair-calculator","Wooden Stair Calculator: Closed Stringer, 3D & DXF","Straight wooden stair with housed (closed) stringers: rise, run, stringer board width and length, comfort check, 3D model and DXF for AutoCAD.","Wooden Stair Calculator (Closed Stringers)",{"slug":50,"title":51,"description":52,"h1":53},"stair-stringer-calculator","Stair Stringer Calculator with Diagram | 3D + DXF","Cut stringer calculator: risers, treads, stringer length, board size and layout diagram from your total rise and run. Free, with 3D and DXF template.","Stair Stringer Calculator (Cut Stringers)",{"slug":55,"title":56,"description":57,"h1":58},"l-shaped-stair-calculator","L-Shaped Stair Calculator with Landing | 3D + DXF","Quarter-turn stair calculator: total rise split over two flights, landing size, stringer lengths and comfort check, with live 3D and DXF drawings.","L-Shaped Stair Calculator with Landing",{"slug":60,"title":61,"description":62,"h1":63},"winder-stair-calculator","Winder Stair Calculator: L-Shaped Kite Winders | 3D","Plan a quarter-turn winder stair: winder angles, tread going, stringers and comfort check. 3D model and DXF drawings.","Winder Stair Calculator (90° L-Shaped Winders)",{"slug":65,"title":66,"description":67,"h1":68},"u-shaped-stair-calculator","U-Shaped Stair Calculator with Landing | 3D + DXF","Half-turn (switchback) stair calculator: risers per flight, landing width, stringer lengths and stairwell size, with live 3D and DXF drawings.","U-Shaped Stair Calculator with Landing",{"slug":70,"title":71,"description":72,"h1":73},"u-shaped-winder-stair-calculator","U-Shaped Winder Stair Calculator (180° Turn) | 3D","Half-turn winder stair around a newel: winder angles, walkline going, stringers and comfort check, with a live 3D model and DXF shop drawings.","U-Shaped Winder Stair Calculator (180° Winders)",{"slug":75,"title":76,"description":77,"h1":78},"three-flight-stair-calculator","Three-Flight Stair Calculator with Two Landings | 3D","Three-flight (three-quarter turn) stair with two quarter landings: flight split, landing sizes, stringers and comfort check, in 3D and DXF.","Three-Flight Stair Calculator with Two Landings",{"slug":80,"title":81,"description":82,"h1":83},"double-winder-stair-calculator","Double Winder Staircase Calculator | 3D + DXF","Three-flight stair with two 90° winder turns: winder angles, walkline going, stringer lengths and comfort check, with 3D model and DXF drawings.","Double Winder Staircase Calculator",{"slug":85,"title":86,"description":87,"h1":88},"concrete-stair-calculator","Concrete Stair Calculator: Volume, Rebar & Landing","Concrete stair calculator with landing: steps, waist slab, concrete volume and rebar weight, plus a 3D model and DXF drawings. Free.","Concrete Stair Calculator with Landing",{"type":90},{"intro":91,"choose":94,"how":97,"norm":101,"faq":103,"related":116},[92,93],"This winder stair calculator designs an L-shaped stair that turns 90° on winder treads instead of a landing. The winders fill the corner, so the stair fits in less space than an L-shaped stair with a landing, which is why quarter-turn winder stairs are so common in terraced houses, cottages and loft conversions.","Enter the total rise (Y), the run of the upper flight (X), the width (W), the steps in each flight (P and Q) and how many winders make up the turn (K). The calculator divides the 90° between the winders, checks comfort and outputs each winder tread as a separate part, with its own shape, ready to cut. With K = 3 you get the classic three-winder turn whose middle tread UK joiners call a kite winder.",[95,96],"Choose the 90° winder stair when there is no room for a landing: the {K} winders fill the corner and turn while climbing, so the L-shaped stair fits in less floor area. It is the most common wooden L-shaped stair in small houses, especially up to a loft or an attic.","The catch is on the newel side, where the going of each winder narrows sharply and where most trips happen. Put the handrail on the outer side, where people walk, and check the shape of each winder in the DXF, because the calculator rates comfort using the going of the straight flights.",[98,99,100],"The total rise Y = {Y} mm is shared between {risers} risers (the {P} steps below, the {K} winders and the {Q} steps above): {riser} mm each. On the straight flights the run is {going} mm and the tread depth {tread} mm.","With K = {K} winders, the 90° turn is divided into equal angles and every winder has a different shape, which is why the bill of materials lists them separately (E2, E3…) and the DXF gives each one its own sheet. With the default values the step formula is {step} mm and the pitch {slope}°: “{grade}”.","If the winders become too narrow on the inside, increase K or the width W: the treads in the turn open up and the going on the walkline grows. A newel post at the inner corner carries the winder stringers, and it appears in the parts list with its own mark.",[102],"Winders are allowed in dwellings in the US, the UK, Australia and Canada, with their own rules. Under the IRC, a winder must have at least 10 in (254 mm) of tread depth at the walkline, 12 in (305 mm) from the narrow side, and at least 6 in (152 mm) at any point. Approved Document K measures the going on the centre line when the stair is narrower than 1 m (at 270 mm from each side when it is wider) and asks for at least 50 mm at the narrow end. Commercial stairs under the IBC may not use winders. The Australian rule that limits winders to three in place of a quarter landing should be checked in the current NCC tables before relying on it.",[104,107,110,113],{"q":105,"a":106},"Are winder stairs legal?","Yes, in homes, as long as the winders meet the tapered-tread rules of your code: in the US a 10 in tread at the walkline and 6 in at the narrow end; in England a going measured on the centre line and at least 50 mm at the narrow end. In commercial buildings they are generally not allowed.",{"q":108,"a":109},"How many winders in a 90° turn?","Usually three, the kite-winder layout. Fewer winders make the treads very narrow on the inside; more winders take up more space. Change K and watch how the tread depth and the verdict change.",{"q":111,"a":112},"Winder stairs or a landing?","Winders save space and about one step's worth of floor area; a landing is more comfortable and safer for children and older people. With the same opening, try both calculators and compare.",{"q":114,"a":115},"What is a kite winder?","The middle tread of a three-winder quarter turn, so called because its four-sided shape looks like a kite. The treads on either side of it are triangular or tapered.",[117,118,119],"wood-l","wood-u-winder","metal-l",1791467609756]