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Concrete Calculator.
Calculate slab volume and estimate bag counts for concrete construction.
Input Parameters
Computed Results
Primary Metric
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Frequently asked questions.
How many bags of concrete do I need?
Calculate the volume in cubic feet (Length × Width × Depth in feet), then divide by 0.6 (cubic feet per 80lb bag) and round up. For example, a 10×10 ft slab at 4 inches deep needs about 56 bags.
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