Calculate Concrete for Steps & Stairs
Calculate cubic yards of concrete needed for stairs. Enter rise, run, width, and number of steps.
Calculating Concrete for Stairs
Stairs require progressively more concrete for each step because lower steps support the weight of upper steps. The volume is the sum of all step volumes: each step = riser height × tread depth × width. Standard residential stairs: 7" riser × 11" tread meets building code in most jurisdictions (IRC max riser: 7.75", min tread: 10").
Building Code Requirements
IRC residential stair code: maximum riser height 7.75 inches, minimum tread depth 10 inches. All risers must be uniform height (max variation: 3/8"). Minimum stair width: 36 inches. Handrails required on at least one side if 4+ risers. Always check local codes — they may be stricter than IRC minimums.
This calculator uses established formulas and industry standards to give you accurate, actionable results.
