Concrete Stair Calculator — Accurate Measurements for Construction

Concrete Stair Calculator

Calculate concrete stair dimensions, riser/tread ratios, material requirements, and building code compliance. Perfect for contractors, builders, and DIY home improvement projects.

Step 1: Stair Specifications

14 steps

Building Code Standards

Standard riser height: 17-18 cm. Standard tread depth: 27-30 cm. Maximum riser: 20 cm. Minimum tread: 22 cm. The ideal formula: 2×Riser + Tread = 60-65 cm.

Step 2: Material Specifications

12 mm
10%

Material Guidelines

For outdoor stairs, use air-entrained concrete for freeze-thaw resistance. Minimum concrete cover for rebar: 40mm. Allow proper curing time (7-28 days) before use.

Concrete Stair Calculation Results

Summary
Stair Visualization
Material Requirements
Code Compliance

Stair Configuration

L-Shaped
14 steps, 280 cm total rise
Riser Height
20.0 cm Good
Tread Depth
25.0 cm Low
2×Riser + Tread
65.0 cm
Concrete Volume
0.63 m³

Stair Visualization

Total Rise
280 cm
Total Run
350 cm
Stair Angle
38.7°
Headroom
203 cm

Material Requirements

Material Quantity Unit Approx. Cost
Cement Required
290 kg
Sand Required
0.45 m³
Aggregate Required
0.90 m³
Rebar Required
85 m

Building Code Compliance Check

Requirement Your Value Standard Range Status

Compliance Summary

Your stair design meets most building code requirements. The tread depth is slightly below the recommended minimum of 27 cm for residential stairs.

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