[{"data":1,"prerenderedAt":119},["ShallowReactive",2],{"pages:en":3,"type:en:concrete":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 concrete stair calculator handles a straight reinforced concrete flight on a waist slab with a top landing, and gives you the concrete quantity and the rebar along with the steps. It suits stairs between floors, entrance steps and basement stairs, and helps you prepare the formwork and the material order.","From the stair height (Y), the flight length (X), the width (W), the top landing (L and E), the waist thickness (S), the nosing thickness (N) and the reinforcement (bar diameter and bars per step), the calculator returns the riser and tread, the concrete volume broken down by part, and the total length and weight of the bars. Switch on Folded plate to model a constant-thickness slab that follows the steps instead of a waist slab.",[95,96],"Choose a concrete stair when it has to last and never move: a reinforced slab with the steps cast on top, indoors or outdoors, and an upper landing to reach a door or a floor slab. It is the cast-in-place stair of entrances, porches, basements and shared areas.","Unlike the steel and timber stairs, there are no parts to cut, only volumes: the calculator gives the concrete for the steps, slab and landing, and the reinforcement (Ø{DR} mm, {K} bars per step). With “Folded plate”, the slab follows the profile of the steps at a constant thickness, uses less concrete and looks lighter from below.",[98,99,100],"The height Y = {Y} mm divided between {C} steps gives {riser} mm per step. The length X = {X} mm over the same steps gives a run of {going} mm, and with the nosing F = {F} mm the tread depth is {tread} mm. Step formula: {step} mm; pitch: {slope}°; verdict: “{grade}”.","The concrete volume is worked out in parts: the landing (L × W × E), each step (the triangle formed by riser and run, times the width) and the waist slab of thickness S = {S} mm along the pitch line of the stair. With a folded plate there is no waist slab; a plate of thickness N follows the profile of the steps and uses less concrete.","The reinforcement is spread as {K} bars of Ø{DR} per step; the Data tab gives the number of bars, their total length and weight. This is a quantity take-off for estimating and ordering, not a structural design.",[102],"The geometry is checked like any other stair, against the code picked in the Summary: under the IRC a riser of up to 7¾ in (196 mm) and a tread of at least 10 in (254 mm) for homes; under the IBC, risers of 4–7 in and treads of 11 in for other buildings; in England up to 220 mm of rise on a private stair. The structure is a different matter: waist thickness, reinforcement and cover must come from a design to the concrete code that applies (ACI 318 in the US, Eurocode 2 in the UK, AS 3600 in Australia, CSA A23.3 in Canada). The concrete class in the bill of materials, C25/30, is the European designation for roughly 25 MPa (about 3,600 psi) and is only a reference.",[104,107,110,113],{"q":105,"a":106},"How much concrete do I need for stairs?","Add up the landing, the steps and the waist slab. With the default values the total appears under “Result with the default values” and in the Data tab, broken down by part. It is a theoretical volume: add a margin for waste and spillage when ordering. To convert cubic metres to cubic yards, multiply by 1.308.",{"q":108,"a":109},"How do you calculate concrete steps?","First the steps, as on any stair: height divided by risers and length divided by treads, with 2R + G between 600 and 660 mm. Then the volume: landing, steps and waist slab. Finally the reinforcement. The calculator does all three at once and updates them as you type.",{"q":111,"a":112},"How thick should the waist slab of a concrete stair be?","It depends on the span and the load and must be set by a structural engineer. The default here is S = {S} mm, a common figure for short residential flights; change it and the volume is recalculated.",{"q":114,"a":115},"What is the difference between a waist slab and a folded plate stair?","On a waist slab stair (type 1) the steps sit on a slab of constant thickness parallel to the pitch line. On a folded plate stair (type 2), also called a sawtooth slab, a plate of constant thickness follows the profile of the steps, using less concrete and looking lighter from below.",[117,118],"wood-straight","metal-straight",1791467610869]