Concrete Stairs Calculator

Calculate concrete volume for poured stairs. Enter total rise, stair width, and tread dimensions for cubic yards and bag counts.

πŸͺœ Concrete Stairs Calculator

Results

Number of Steps5 steps
Actual Riser Height7.20 in
Volume13.8 cu ft
Volume0.51 cu yd
80 lb Bags23 bags

πŸ’‘ How to Calculate Concrete for Stairs

Poured concrete stairs are calculated by combining the volume of each individual step plus the underlying slab (stringer) volume. Each step is essentially a rectangular block: tread depth Γ— riser height Γ— stair width. The stringer adds a triangular cross-section beneath the steps.

Building code requirements for stairs: riser height 4–7.75 inches (7–7.5 inches is ideal), tread depth minimum 10–11 inches, and stair width minimum 36 inches. The total rise determines the number of steps: divide total rise by desired riser height and round to the nearest whole number.

A 36-inch total rise with 36-inch wide stairs, 7.5" risers, 11" treads, and 6" slab: 5 steps. Volume β‰ˆ 8.4 cu ft = 0.31 cu yd. That's about 14 bags of 80 lb concrete mix.

Concrete Stairs Calculator FAQ

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