Enter your Number of Steps, Tread Run, Riser Height, Stair Width, and Slab Thickness into the Concrete Stairs Calculator to get your Total Concrete Volume, broken down into Steps Volume and Landing Volume — plus your Total Rise and Total Run for a complete picture of your staircase dimensions.
Total Concrete Volume
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Steps Volume
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Landing Volume
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Total Rise
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Total Run
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The basic formula is: (Effective tread run × Riser height ÷ 2) × Number of steps × Stair width. This calculates the triangular area of each step multiplied by the total number of steps and stair width.
Calculate the area of each step (triangular shape), multiply by the number of steps and stair width. Add any landing volume if applicable. The result gives you the total concrete volume needed.
Yes, concrete stairs typically require rebar reinforcement for structural integrity. Use #4 rebar spaced 12 inches on center in both directions for most residential applications.
Standard stair width ranges from 36 to 48 inches for residential stairs. Commercial stairs are typically 44 to 72 inches wide, depending on building codes and occupancy requirements.
Standard riser height is 6 to 8 inches, with 7 to 7.5 inches being most common. Tread depth (going) should be 10 to 12 inches for comfort and safety.
Always order 10-15% extra concrete to account for waste, spillage, and slight variations in measurements. This ensures you have enough material to complete your project.
This calculator is designed for straight stairs. Curved or spiral stairs require more complex calculations due to their varying dimensions and should be calculated by a structural engineer.
Concrete stair slabs are typically 6 to 8 inches thick for residential use. Commercial or heavy-duty applications may require 8 to 12 inches depending on load requirements.