Concrete Stairs Volume Calculator

Estimate Concrete for Staircase Pour

Input Fields

Number of steps

n

Height per step

t

in

Depth per step

r

in

Stairs width

w

in

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Concrete Volumec

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Concrete Volume Formula for Stairs

$$c = \left( \frac{n \cdot \frac{t}{12} \cdot n \cdot \frac{r}{12}}{2} + \frac{n \cdot \left( \frac{t}{12} \cdot \frac{r}{12} \right)}{2} \right) \cdot w \cdot 0.037037$$

• $$n$$ — number of steps
• $$t$$ — tread length (inches)
• $$r$$ — riser height (inches)
• $$w$$ — width (inches)
• $$0.037037$$ — conversion factor to cubic yards

This formula combines the area of triangular and rectangular components of the steps, converting all dimensions from inches to feet before applying the conversion to cubic yards. It’s commonly used in residential and commercial stair construction to accurately determine how much concrete is needed, avoiding under- or overestimation.