Estimate concrete and materials for a solid stoop, landing, or stairs cast on a slope.
The steps calculator supports two selectable geometries: solid concrete steps on grade and stairs cast directly against an earth slope or hillside. Enter stair width, riser count, rise, and tread run, then add a landing or sidewalls when needed. Results include concrete volume, bag and ready-mix quantities, a 10% default order allowance, selectable base material quantity when included, reinforcement quantity, cost, and a 3D geometry preview.
Small changes in rise, run, landing height, throat depth, or sidewall layout can materially change volume. Use the mode that represents how the stair will actually be built; a solid stoop should not be estimated as a hillside stair. The planner checks entered geometry against common IRC 2021 values of 7¾ inches maximum riser and 10 inches minimum tread, while reminding users that locally adopted codes can differ.
Exterior steps may need compacted base, drainage slope, isolation from the building, reinforcement, and a footing below local frost depth. The calculator provides planning quantities and code-awareness notes, not a complete stair or reinforcement design. Step form boards, bracing, stakes, and specialty form hardware are excluded from the cost estimate and should be confirmed from the actual layout.
Yes. The standard stoop starts with a 36-inch landing enabled by default and reports the landing volume separately when it contributes concrete. You can change the landing dimensions or turn it off for a flight-only estimate.
The soft check references common IRC 2021 values: maximum 7¾-inch risers and minimum 10-inch treads. Always verify the code adopted by the local authority.