Concrete Calculator
Calculate how much concrete you need for a slab, patio, or footing. Enter the dimensions to get the volume in cubic yards and cubic feet, plus the number of 60 lb and 80 lb bags required.
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Concrete Calculator
construction calculator
ft
ft
in
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How It Works
Formula
Cubic Feet = Length × Width × (Thickness ÷ 12) Cubic Yards = Cubic Feet ÷ 27
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Examples
10×10 ft slab, 4 in thick
1.23 cubic yards, about 74 bags of 60 lb.
Frequently Asked Questions
How much concrete do I need?
Multiply length × width × thickness (in feet), then divide by 27 for cubic yards. A 10×10 ft slab at 4 inches thick needs about 1.23 cubic yards.
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How many bags of concrete in a cubic yard?
A cubic yard requires about 60 bags of 60 lb concrete or 45 bags of 80 lb concrete. For large pours, ready-mix delivery is usually more economical.
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