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Stair Reinforcement Calculator
Enter your top landing, flight and bottom landing dimensions and get the real geometric bar lengths for a stair waist-slab section — the same calculation logic reoXapp uses. Values are shown individually so you can combine them to match your own bar layout and detail.
Stair & bar
mm
Top landing
mm
mm
mm
mm
mm
mm
Flight
mm
mm
mm
mm
mm
mm
Bottom landing
mm
mm
mm
mm
mm
mm
Calculated Lengths
Top landing (B / C / F)
B — landing run, longer–
C — landing run, shorter–
F — hook/bend (bar dim. X)–
Flight (A / D)
D — diagonal run–
A — hook/bend (bar dim. Y)–
Bottom landing (E / H / I)
H — landing run, longer–
I — landing run, shorter–
E — hook/bend (bar dim. Z)–
Stair angle: –
How to use these: Each value is a real, individually-computed length (in mm) for a specific part of the stair section — they're shown separately rather than pre-added into a "top bar" / "bottom bar" total, since exactly how they combine depends on your own bar layout and bend detail. Add together whichever values match the bar you're detailing (e.g. a landing run + the flight diagonal + the far landing run, plus any hook allowance you're using) to get a real cut length.
This is one flight at a time. Real jobs aren't.
reoXapp reads a full set of structural plans — footings, slabs, walls, stairs and all — and hands back the whole bar mark schedule in minutes.
Try a Real Takeoff — $14.55← All Free Tools · Also free: Bar Weight Calculator