Expert Guide
Concrete Calculators
Staircase Concrete Calculator – Step & Waist Slab
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Calculate the total concrete required for your RCC staircase by entering the number of steps, rise, tread, and waist slab thickness.
📐 Formula & Method
The total volume is the sum of the volume of triangular steps and the rectangular waist slab. Waist slab length is calculated using the Pythagorean theorem based on total rise and total tread.
Step Volume = 0.5 × Rise × Tread × Width × Steps
Waist Length = √((Steps × Rise)² + (Steps × Tread)²)
Waist Volume = Waist Length × Width × Thickness
📋 Worked Example
For 10 steps (0.15m Rise, 0.25m Tread, 1m Width, 0.12m Waist): • Step Volume = 0.5 × 0.15 × 0.25 × 1 × 10 = 0.1875 m³ • Waist Length = √((1.5)² + (2.5)²) ≈ 2.915m • Waist Volume = 2.915 × 1 × 0.12 = 0.3498 m³ • Total = 0.537 m³
❓ Frequently Asked Questions
The waist slab is the structural inclined slab of an RCC staircase on which the steps are constructed.
No, landings are typically rectangular slabs. You can calculate landing volume separately using the Concrete Volume Calculator.
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