[{"data":1,"prerenderedAt":122},["ShallowReactive",2],{"pages:en":3,"type:en:metal-straight":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":104,"related":120},[92,93],"This steel stair calculator covers the most common job in a fabrication shop: a straight flight on a rectangular tube stringer, single (centre) or double, with a bracket welded under each tread. Enter the total rise (Y), the run available (X) and the stair width (W); the calculator spaces the steps, checks comfort and draws every part for the workshop.","Most metal stair calculators with a diagram stop at rise and run. This one also gives you the stringer, every tread bracket and the railing as separately marked parts, a bill of materials with weights, and steel staircase AutoCAD drawings in DXF built from your own dimensions instead of a generic DWG block. The same model works for steel treads in chequer plate or timber treads on a steel frame: tread thickness (Z) and nosing (F) change the usable tread depth, while the stringer tube (A × G) and the bracket tube (B) change the weight.",[95,96],"Choose the straight stair with brackets when the opening is long and narrow and you want the fewest parts: one tube stringer (or two or three, set with T) and an angled bracket under each tread, welded in the shop and installed in one piece. Seen from the side it is the lightest-looking steel stair: the treads seem to float above the stringer.","Compared with the sawtooth version, each tread sits on its own bracket rather than on a tooth, so it can be wider than the structure and a centre stringer stays hidden underneath. The trade-off is one bracket to cut and weld per step. If the opening is too short for a comfortable pitch, don't squeeze the treads: switch to a stair that turns.",[98,99,100],"The total rise Y = {Y} mm is divided into {risers} risers of {riser} mm. The run X = {X} mm is shared between the {C} steps of the flight, giving a run per step of {going} mm; add the nosing F = {F} mm and the tread depth is {tread} mm.","The step formula then reads 2 × {riser} + {going} = {step} mm and the pitch is {slope}°, so the verdict with the default values is “{grade}”. Whenever the formula falls outside 600–660 mm or the pitch goes above 40°, the Summary panel tells you how many steps to add or how much longer X needs to be, and applies the change in one click. For a US dwelling the riser must also stay at or below 7¾ in (196 mm); the code check in the Summary (IRC/IBC by default) flags it when it goes over.","The structure comes from the stringer parameters: the tread sits H = {H} mm above the stringer, projects D = {D} mm past its bracket, and the bracket leans U = {U}° from vertical. The bracket spacing along the stringer, listed in the Data tab, is the distance you mark out on the tube before welding. With T = 1 the stair has a single centre stringer (a mono or spine stringer); with 2 or 3, the stringers are spread across the width.",[102,103],"The calculator does not size the steel. The tube you choose sets the geometry and the weight, but the strength of the stringers, brackets and welds has to be checked by an engineer under the steel design standard that applies (AISC 360 in the US, Eurocode 3 in the UK, AS 4100 in Australia, CSA S16 in Canada).","Open risers are the norm on steel stairs, and both main codes limit the gap. In US dwellings, the IRC requires that a 4 in (102 mm) sphere cannot pass through an open riser where the stair is more than 30 in above the floor below. Approved Document K asks for treads that overlap by at least 16 mm and openings that stop a 100 mm sphere. The open riser gap shown in the Data tab is the figure to compare.",[105,108,111,114,117],{"q":106,"a":107},"How do you calculate a steel stair?","The same way as any stair: divide the total rise by the number of risers, divide the run by the number of treads and check that 2R + G stays between 600 and 660 mm. Then lay out the stringer, the brackets and the treads. The calculator does both parts at once and adds the bracket spacing, the cut list and the weight.",{"q":109,"a":110},"Is there free steel stair design software that exports DXF?","This calculator runs in the browser, is free and needs no installation or account. It exports a DXF (AutoCAD 2007, in millimetres or inches) with a dimensioned general arrangement, one sheet per part and a bill of materials, ready for the shop or for your architectural drawings.",{"q":112,"a":113},"Single centre stringer or two side stringers?","A centre stringer (T = 1) looks lighter and lets the treads cantilever on both sides, but it works in torsion when someone steps on the edge. Two stringers (T = 2) support the tread near its ends and cope better with wider stairs. Change T and the 3D model, drawings and weight update immediately.",{"q":115,"a":116},"What size tube should I use for the stringer?","The calculator does not choose it for you. The default is a {A} × {GW} mm tube, a common size for residential stairs, but the final section depends on the span, the load and the connections, and must be confirmed by a structural calculation.",{"q":118,"a":119},"Can I fit wooden treads on a steel frame?","Yes. Under Finishes you choose the tread material (oak, walnut, chequer plate, laminated glass or microcement) and the bill of materials recalculates the weights with the density of each material.",[121],"wood-straight",1791467607267]