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Concrete Calculator
Cubic yards and bags needed for slabs, columns and footings.
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Shape
Results
Concrete Needed
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80-lb Bags
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60-lb Bags
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How to use the Concrete Calculator
Pick the shape, enter dimensions โ slab uses length ร width ร thickness; columns use diameter ร height.
How concrete is estimated
Volume in cubic feet รท 27 = cubic yards (how ready-mix is ordered). Slab: length ร width ร thickness. Column: ฯrยฒh. One cubic yard โ 45 eighty-pound bags or 60 sixty-pound bags.
Ordering tips
Order 5โ10% extra โ forms bulge and subgrades vary. Standard thickness: 4" patios/walkways, 5โ6" driveways. Read our full guide: how to calculate concrete needed.
Frequently Asked Questions
About 45 eighty-pound bags or 60 sixty-pound bags per cubic yard. Always order 5โ10% extra.
4 inches for patios and walkways, 5โ6 inches for driveways and garage floors.