Density Constants
Standard Bag Yields
*Approximate yield after water addition.
Water Ratio Tip
Always start with 3/4 of targeted water. Excess water significantly reduces structural PSI.
Adding a 10% waste factor is industry standard to account for spills, uneven forms, and consolidation.
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Concrete Stairs Calculator Logic
Frequently Asked Questions
Muhammad Shahbaz Siddiqui
Founder, TheCalculatorsHub
How I calculated the pour volume for 7 exterior stairs
In October 2025, I was adding exterior stairs to a side entrance. The staircase had 7 treads, each 900 mm wide, with 175 mm risers and 280 mm going. Before ordering concrete, I needed a reliable volume estimate for the stepped structure, which is significantly harder to calculate by hand than a flat slab.
I put the step count and dimensions into this calculator and got 0.38 m³. According to ACI guidelines on exterior residential stairs, a minimum 200 mm slab thickness under the steps is standard for soil-bearing applications, which I confirmed was included in my formwork depth. I ordered 0.5 m³ from a local ready-mix supplier to account for form leakage and settling. The pour took under 2 hours and the stairs have been in daily use since without settling or cracking.