[{"data":1,"prerenderedAt":119},["ShallowReactive",2],{"pages:en":3,"type:en:wood-cut":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 stair stringer calculator works out cut stringers: boards notched into a sawtooth so that each tread sits on top of a tooth (open stringer in North America, cut string in the UK). Enter your total rise and total run and you get the number of risers and treads, the riser height, the run, the stringer length and a dimensioned layout diagram of the stringer, plus a 3D model of the whole stair.","Unlike a closed stringer stair, the treads here show their ends and can overhang the stringers. The step layout is the same as on the straight wooden stair, and the DXF gives you each cut stringer at full size, in millimetres or inches, so you can print it as a template or send it to a CNC router instead of marking it out by hand.",[95,96],"Choose the cut-stringer stair when you want an open wooden stair with the stepped profile on show: the stringer is notched into teeth and each tread rests on top. It is the typical porch, deck or basement stair, and the simplest joinery stair to lay out.","Compared with the stair with board stringers, the notches remove timber: from the same board a cut stringer is weaker, so it usually needs a deeper section. The step layout does not change: the same height, length and number of steps give the same riser, the same going and the same pitch ({slope}°).",[98,99,100],"The total rise Y = {Y} mm over {risers} risers gives {riser} mm per step; the run X = {X} mm over {C} steps gives a run of {going} mm and a tread depth of {tread} mm with the nosing. Step formula: {step} mm. Pitch: {slope}°. Verdict: “{grade}”.","The notches reproduce the rise and run of every step, so the stringer sheet in the DXF doubles as a cutting template. The board is {T} mm thick by default. The Data tab gives the nosing-to-nosing distance along the pitch line: multiply it by the number of treads and add the top and bottom cuts to get the stringer length you need to buy.","The calculator draws the two outer stringers. On wider stairs, carpenters usually add a third stringer in the middle; it is cut exactly like the outer ones.",[102],"The rules are those of any straight stair: 7¾ in (196 mm) maximum rise and 10 in (254 mm) minimum tread under the IRC, 220 mm rise and 42° pitch under Approved Document K. Cutting the notches removes wood, so the depth left below the notches must be checked against the span and the load. For outdoor deck stairs, check the stringer rules in your local code or the deck construction guide your inspector uses.",[104,107,110,113],{"q":105,"a":106},"How do you calculate stair stringers?","Divide the total rise by the number of risers to get the riser height, and the total run by the number of treads to get the run per step (there is always one tread fewer than risers when the top step is the upper floor). The stringer length is the hypotenuse: the square root of total rise squared plus total run squared, plus a little for the top and bottom cuts.",{"q":108,"a":109},"How long is a 2x12 for a 7-step stringer?","With 7 risers of 7¼ in (50¾ in of total rise) and 6 treads of 10 in (60 in of run), the pitch line is √(50.75² + 60²) ≈ 78.6 in, about 6 ft 7 in, so an 8 ft 2x12 is enough. If you mean seven treads and eight risers, the line is about 91 in (7 ft 7 in): an 8 ft board leaves almost nothing for the cuts, so buy a 10 ft one.",{"q":111,"a":112},"Should stair stringers be 2x10 or 2x12?","For cut stringers, 2x12 is the usual choice: once the notches are cut, a 2x10 keeps little wood below them. A 2x10 can work for a closed stringer, which is not notched. In metric terms, the default here is a {T} mm board; the right depth depends on span and load.",{"q":114,"a":115},"How do you mark out a cut stringer?","Traditionally with a framing square, setting the rise on one arm and the run on the other and stepping it along the board tooth by tooth. With the DXF you can skip that: the stringer sheet carries the complete profile at full size.",[117,118],"wood-straight","metal-straight-toothed",1791467609398]