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Concrete Steps Calculator — Solid Stair Volume, Bags & Cost

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Number of equal steps Rise per step (in) Tread depth / run per step (in) Overall stair width (ft) Extra top landing depth (ft, optional) Allowance (%) Concrete yield per bag (cu ft) Use the actual product yield.Price per bag (optional)

Calculated result

0.871 yd³ concrete

21.389 cu ft solid stepped stair mass

No extra top-landing extension entered.

23.528 cu ft after allowance · 40 whole bags at 0.6 cu ft/bag

Bag price is optional.

Show the working

1. Stacked-step factor n(n+1)/2 = 4×5/2 = 10.
2. Cross-section = 0.5833 × 0.9167 × 10 = 5.3472 sq ft.
3. Stair mass = 5.3472 × 4 = 21.389 cu ft.
4. Landing extension = 0.
5. Adjusted total = 21.389 × 1.1 = 23.528 cu ft.

Simple solid stepped-prism model only. Hollow, filled-core, suspended or structurally formed stairs need a project-specific quantity model.

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