Free Concrete Calculator. Enter dimensions to instantly calculate cubic yards, number of bags, and estimated concrete cost for slabs, footings, and columns.
🧱 Concrete Calculator
💡 Pro Tip
Always add 10% extra to your concrete order to account for spillage, uneven sub-base, and waste. Running short mid-pour can create cold joints that weaken the slab.
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Frequently Asked Questions
Q: How many bags of concrete do I need?
One 80lb bag of concrete mix covers approximately 0.60 cubic feet. For a 10x10 ft slab at 4 inches thick, you need about 1.23 cubic yards or roughly 56 bags.
Q: How do I calculate cubic yards of concrete?
Cubic Yards = (Length ft × Width ft × Depth ft) ÷ 27. Divide by 27 because there are 27 cubic feet in a cubic yard.
Q: What is the cost of concrete per cubic yard?
Ready-mix concrete typically costs $120 to $180 per cubic yard, depending on your region and mix design.
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