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Concrete Stairs Calculator
Calculate how much concrete you need to pour a set of outdoor steps.
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What this calculator does
This tool calculates the concrete volume needed to form a staircase, treating each step as a stacked rectangular slab that grows taller with each riser going up from the base.
The formula
Each step’s volume is its cumulative height (rise × step number from the bottom) × run × width, and these are summed for all steps, then converted from cubic inches to cubic yards.
This assumes solid stairs poured on grade or over a solid sub-base, without accounting for a hollow understructure, forms, or a separate footing — add those materials separately as needed.
Last reviewed August 2026