[{"data":1,"prerenderedAt":119},["ShallowReactive",2],{"pages:en":3,"type:en:wood-three-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 double winder staircase calculator designs a three-flight wooden stair that makes two 90° turns on winder treads, with no landings. In the UK this is what a double winder stair means: two quarter turns with a short straight flight between them. It is the most compact of the stairs that wrap around a square opening, and a common choice for loft conversions and narrow houses.","Enter the total rise (Y), the run of the upper flight (X), the width (W), the steps in each flight (P, M and Q) and the winders in each turn (K). The calculator lays out both sets of winders and outputs every winder tread as its own part. If the opening allows it, the three-flight stair with two landings is more comfortable; if you are thinking of a single 180° turn around one newel, see the U-shaped winder stair instead.",[95,96],"Choose the three-flight winder stair when the opening is small and almost square: each 90° turn is made with {K} winders and no landing, so the stair climbs further in less floor area than any other with straight flights. It is the usual way up to an attic or a mezzanine through an opening of about 2 × 2 m.","The price is comfort: with the default values the verdict is “{grade}”, and the winders narrow next to the posts. If there is room, the version with landings is much safer; if not, check the going of each winder in the DXF, which the calculator does not check, and fit a continuous handrail on the outer side.",[98,99,100],"The total rise Y = {Y} mm is shared between {risers} risers: {riser} mm per step. On the straight flights the run is {going} mm and the tread depth {tread} mm with the nosing F = {F} mm.","Each turn has K = {K} winders sharing the 90°. Step formula: {step} mm; pitch: {slope}°; verdict: “{grade}”. In such a small opening it is easy to end up with a short tread: the Summary panel tells you how far to extend the nosing or how many steps to remove to fix it.","The middle flight (M) sets the width of the stair as a whole, and the two outer flights (P and Q) its depth. Moving one step from P to M, or from M to Q, is often enough to make the stair fit without changing the riser height.",[102],"Each set of winders must meet the tapered-tread rules: 10 in (254 mm) at the walkline and 6 in (152 mm) at any point under the IRC; a going measured on the centre line and at least 50 mm at the narrow end under Approved Document K. With two turns in a small space, also check the headroom under the floor above: 2.0 m in England or, in a loft conversion with limited space, 1.9 m at the centre of the stair and 1.8 m at the side.",[104,107,110,113],{"q":105,"a":106},"What is a double winder staircase?","A stair with two 90° winder turns and a short flight between them, so it changes direction twice without a landing. It is different from a 180° winder, where a single group of winders turns half a circle around one newel.",{"q":108,"a":109},"What are typical double winder staircase dimensions?","It is designed for small, roughly square openings: the default here is an opening {X} mm long for a {W} mm wide stair and a rise of {Y} mm. The Summary panel gives the exact footprint, and it changes as you move steps between P, M and Q.",{"q":111,"a":112},"How many winders in each turn?","Three per 90° turn is usual, which is the default (K = {K}). More winders open up the turn but take up more floor area.",{"q":114,"a":115},"How do I see the shape of each winder?","In the Drawings tab, by clicking its mark (E2, E3…): every winder has its own sheet with dimensions, and in the DXF it sits on the TREADS layer, ready to cut.",[117,118],"wood-three","wood-l-winder",1791467610471]