Poured concrete stairs: volume in cubic yards and metres, formwork area, and a rebar length estimate.
Poured-concrete stair volume is the sum of the step triangles plus the structural waist slab running up the incline. The calculator returns volume in both cubic yards (US ready-mix ordering) and cubic metres, plus a formwork area estimate and a rough rebar length. Always order a little extra concrete to allow for spillage and uneven subgrade.