A concrete calculator finds cubic yards of concrete and how many bags you need. A 10 ft × 10 ft slab that is 4 inches thick needs about 1.2 cubic yards of concrete.
A concrete calculator finds cubic yards of concrete and how many bags you need. A 10 ft × 10 ft slab that is 4 inches thick needs about 1.2 cubic yards of concrete. Our concrete calculator is built on the same core concrete volume calculator cubic yards of concrete concrete bags calculator and is trusted by students, professionals and everyday users who need a fast, accurate result. Because every calculation runs locally in your browser, there is no waiting, no sign-up and no limit on how often you use it.
Cubic Yards Formula: (Length × Width × Depth in feet) ÷ 27
Convert slab thickness in inches to feet before calculating volume in cubic yards for ready-mix truck orders.
Bags of Concrete Needed (60 lb vs. 80 lb)
A 60 lb bag yields ~0.45 cubic feet (requires 60 bags per cubic yard). An 80 lb bag yields ~0.60 cubic feet (requires 45 bags per yard).
Factoring in 10% Construction Waste Margin
Always add a 10% safety margin to account for slab deflection, uneven subgrades, and spillage during pouring.
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