[{"data":1,"prerenderedAt":116},["ShallowReactive",2],{"pages:en":3,"type:en:metal-u":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":113},[92,93],"This U-shaped steel stair calculator, also known as a switchback or half-turn stair calculator, covers two parallel flights of bracketed stringer joined by a landing twice the width of the stair. It is the answer when the opening is short and wide, and the most common steel stair between floors in homes, warehouses and industrial units. In the UK the same layout, with the flights side by side and no gap between them, is called a dog-leg stair.","From the total rise (Y), the length of the opening (X), the width of each flight (W), the landing depth (E) and the steps in each flight (P and Q), the calculator works out the steps, checks comfort and produces the stringers, landing frame, posts and railing as fabrication drawings in DXF.",[95,96],"The U-shaped steel stair with a landing, a switchback, makes the most of a short, wide opening: the two flights climb side by side and the landing spans twice the stair width. It is the usual choice in industrial units, mezzanines and public buildings, because you arrive right above where you started.","Compared with an L-shaped stair, it fills a rectangle two stair widths wide ({W} mm per flight) instead of two sides of a corner. Compared with the sawtooth version, it uses straight stringers with brackets. Keep the landing depth (E = {E} mm) at least equal to the flight width: a shallow landing forces people to pivot on one foot halfway up.",[98,99,100],"The total rise Y = {Y} mm over {risers} risers, including the one onto the landing, gives {riser} mm per step. On the upper flight, the length X = {X} mm minus the landing depth E = {E} mm leaves room for Q = {Q} steps: a run of {going} mm and a tread depth of {tread} mm.","2 × {riser} + {going} = {step} mm and a pitch of {slope}°: “{grade}”. The landing depth E has a direct effect: make it shorter and every step of the upper flight gets more run, so the pitch drops. Make it deeper and you gain a more generous resting place at the cost of a steeper flight.","The landing is two flights wide (2 × W) and E deep. It has a tube frame and two posts at the free corners, and the two stringers arrive at it at different heights, one riser apart, which the side elevation in the drawings shows clearly.",[102],"Under the IRC, a landing must be at least as wide as the stair it serves, and at least 36 in (914 mm) deep where the stair runs straight on. Approved Document K asks for landings at least as wide and as long as the narrowest flight, so on a switchback keep the landing depth E at least equal to the flight width W. On commercial and industrial stairs in the US, the IBC applies instead: risers of 4–7 in and treads of 11 in or more.",[104,107,110],{"q":105,"a":106},"How do you calculate a U-shaped stair with a landing?","Like a straight stair with one extra riser for the landing: divide the total rise by all the risers and each flight's run by its treads. The difference is that the landing takes part of the opening's length (the depth E), so subtract it before sharing out the treads.",{"q":108,"a":109},"How much space does a switchback stair need?","In plan, the width of two flights by the length X. The Summary panel shows the footprint, and it updates as soon as you change W, E or the number of steps.",{"q":111,"a":112},"U-shaped stair with a landing or with winders?","With a landing, like this one, it is safer and more comfortable. Without a landing, the turn is made with winder treads: that is the U-shaped winder stair, which has its own calculator in wood.",[114,115],"wood-u","wood-u-winder",1791467608786]