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Concrete Calculator â Yards & Bags for Slabs, Footings & Columns
Calculate cubic yards and bags of pre-mix concrete needed for patios, slabs, footings, round columns, and stairs.
Concrete Calculator â Yards & Bags for Slabs, Footings & Columns
Calculate cubic yards and bags of pre-mix concrete needed for patios, slabs, footings, round columns, and stairs.
Calculated Results
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Enter your values on the left and click Calculate to view instant results.
How to Use This Concrete Calculator
- Select structure type: Slab/Footing, Round Column, or Steps.
- Enter dimensions in feet and inches.
- Click Calculate Concrete to view cubic yards, cubic feet, and 60lb/80lb bag counts.
Mathematical Formula & Methodology
Cubic Yards = (Length (ft) × Width (ft) × Depth (ft)) ÷ 27 × 1.10 (+10% spillage)
Frequently Asked Questions
It takes approximately 45 bags of 80 lb concrete (or 60 bags of 60 lb concrete) to make 1 cubic yard.