Stairs and guardrail

Give it the floor-to-floor rise. You get the riser and tread count, a cut stringer profile at 1:1, the post and baluster layout, the code checks and a cut list for the whole stair.

Stair

Units

Geometry is computed in millimetres either way; inch values are converted at exactly 25.4 mm and shown to the nearest 1/16 with the exact decimal alongside.

Total rise mm, floor to floor Going mm tread depth Width mm clear Max riser mm, IBC 178 Stringer depth mm Stringers Guard height mm, 1067 Handrail height mm, 914 Rail sides Max post spacing mm Infill Risers

free preview

16 risers × 15 treads

rise 168.8 mm (6 5/8") · run 4200 mm · 32.74°

Cut length4993 mm 196 9/16"

Throat81.2 mm 3 3/16"

Posts12 6/side @ 998.6 mm

Clear gap93.2 mm 3 11/16"

Handrail4993 mm per side

Run4200 mm 165 3/8"

Code checks

Check	This stair	Limit
riser height	168.8 mm 6 5/8"	≤ 178 mm	ok
going	280 mm 11"	≥ 279 mm (IBC)	ok
guard height	1067 mm 42"	≥ 1067 mm (IBC)	ok
handrail height	914 mm 36"	864–965 mm	ok
clear opening	93.2 mm 3 11/16"	≤ 102 mm	ok
post spacing	998.6 mm 39 5/16"	≤ 1200 mm	ok
stringer throat	81.2 mm 3 3/16"	≥ 90 mm (rule of thumb)	check

These are the common US values, not a structural design. Capacity, connections and anchorage are your engineer's call — the geometry is what we make exact.

Cut list

item,qty,length_mm,length_in,note
stringer,2,4993.0,"196 9/16""","cut stringer, 250 deep, 15 notches"
tread,15,1000.0,"39 3/8""",going 280
guard post,12,1067.0,"42""",6 per side at 999 centres
handrail,2,4993.0,"196 9/16""","raked, one per side"
baluster,80,914.0,"36""",clear gap 93.2 mm / 3.669 in

DXF stringer profile CSV cut list JSON spec

Files are on the Shop plan — the drawing and the numbers above stay free.