Concrete Stairs Calculator
Estimate concrete for poured steps.
Enter the number of steps, the width of the stairs, and the rise and run of each step to estimate the concrete needed for a solid poured staircase, in cubic yards and 80-lb bags.
How it works
The side profile of a solid staircase is a stack of steps. Its cross-sectional area is rise × run × n(n+1)/2 (in feet), and the volume is that area times the stair width. A small waste allowance covers forming and overflow.
Frequently asked questions
How much concrete do I need for stairs?
Use rise × run × n(n+1)/2 for the side profile area, then multiply by the width. A 3-step, 4-ft-wide staircase with 7-inch rises and 11-inch runs needs about 0.50 cubic yards.
Are poured concrete stairs solid?
This estimate assumes a solid pour on grade. Stairs formed over fill or with hollow cores use less concrete.
Should I add waste for concrete stairs?
Yes — around 5% covers form irregularities and overflow at the step edges.
Is this calculator free and private?
Yes. Every CubicCabin calculator runs entirely in your browser, so the numbers you enter are never uploaded or stored. There's no sign-up, no limits, and it keeps working even if you lose connection after the page loads.