Concrete Stair Design Calculator

Professional RC stair design per ACI 318 / EIT 1008-38

ACI 318-19EIT 1008-38Comfort Check (2R+T)Transparent Steps

Note: This tool calculates per ACI/EIT standards but does not replace review by the design engineer.

Floor-to-Floor Height (m)

Horizontal Run (m)

Slope angle: 33.7 deg — Typical range

Riser Height (mm)

Tread Width (mm)

Comfort: 2R + T = 584 mm — Acceptable

Number of Steps

(Auto-calculated from height / riser)

Stair Width (m)

Waist Thickness (mm)

(Leave blank for auto-calculation)

Landing Position

Landing Length (m)

Use service (unfactored) values in kN/m²

Live Load (kN/m²)

Dead Load — Finishes (kN/m²)

Tiles, plaster, handrails, etc.

Concrete Grade

Steel Grade

Building Code

Support Type

Design Method

Ready to Calculate

Fill in the form and click "Calculate Stair Design"