[{"data":1,"prerenderedAt":115},["ShallowReactive",2],{"pages:en":3,"type:en:metal-straight-toothed":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],"A sawtooth stringer (also called a notched or zig-zag stringer) replaces the straight beam with a stepped profile: each tread rests on a short horizontal length of tube, joined to the next one by an upright. It is the stringer of choice for exposed, architectural steel stairs, and in the shop it is made by cutting and welding short lengths of tube rather than bending plate.","This metal stair stringer calculator spaces the steps from the total rise (Y) and run (X), then breaks each stringer down into horizontals and uprights, each with its mark and quantity. If you prefer a straight stringer with one bracket per tread, use the steel stair calculator instead.",[95,96],"Choose the sawtooth stair when you want the steps to show: each stringer is built from horizontal and vertical tube sections in a zigzag, and every tread bears on the full depth of its tooth, with no separate brackets. It is the workshop or loft look, and suits checker-plate or solid timber treads.","Compared with the bracket version it uses two side stringers (T = {T}) instead of a centre one, with more cuts and welds, but each tread is supported on both sides. The step layout is the same: with the same height, length and number of steps you get the same riser and the same going, so you can decide on the structure last.",[98,99,100],"The total rise Y = {Y} mm divided into {risers} risers gives {riser} mm per step, and the run X = {X} mm over {C} steps gives a run of {going} mm. With the nosing F = {F} mm the tread depth is {tread} mm; the step formula is {step} mm and the pitch {slope}°. Verdict: “{grade}”.","On a sawtooth stringer each tooth is one horizontal as long as the going and one upright as tall as the riser, both in {A} × {GW} mm tube. That is why rise and run are not just comfort figures here: they are the cutting lengths printed on the sheet of each part in the DXF, so a riser that changes by a few millimetres changes every piece of the stringer.","With T = 2 the stair has two sawtooth side stringers; with T = 1, a single one under the centre of the tread.",[102],"The tread and riser rules are those of any straight flight. What is specific to this structure is the welded joint at every tooth: the calculator gives the geometry and the cut lengths, but the tube section and the welds must be checked in the structural design. A channel or plate stringer cut to a sawtooth profile behaves differently from welded tube and is not modelled here.",[104,107,110],{"q":105,"a":106},"What is a sawtooth stringer?","A stringer shaped like the stair itself, in a zig-zag, with the treads sitting on top of each tooth. In steel it is made from welded horizontal and vertical tube sections; in timber it is cut from a board, and then it is called a cut stringer.",{"q":108,"a":109},"Sawtooth stringer or straight stringer with brackets?","The sawtooth version shows the stepped profile and usually has two side stringers; the straight stringer with brackets is quicker to make because it has fewer cuts and welds. With the same opening, both calculators give the same steps, so you can compare the number of parts and the weight.",{"q":111,"a":112},"Where can I see the length of each stringer section?","In the Drawings tab and in the DXF: every horizontal and every upright has its own sheet with dimensions and quantity. The Parts tab lists them by mark, and hovering over a row highlights the part in the 3D view.",[114],"wood-cut",1791467607282]