Estimate the total volume, weight, pre-mixed bag quantities (80lb, 60lb, 50lb), and estimated cost of concrete required for slabs, square footings, round columns, sonotubes, and stairs.
Concrete is ordered and measured in cubic yards (1 yd³ = 27 ft³). To calculate the volume needed for a rectangular slab or patio:
Example: A 10 ft by 10 ft patio poured 4 inches thick (4 ÷ 12 = 0.333 ft):
Volume = (10 × 10 × 0.333) ÷ 27 = 33.33 ÷ 27 = 1.23 cubic yards.
Best for small footings, fence posts, and minor repair jobs. One 80-pound bag yields 0.60 cubic feet, meaning you need 45 bags to make one single cubic yard.
Most cost-effective and labor-saving for driveways, house slabs, and large patios. Standard concrete transit mixer trucks hold 8 to 10 cubic yards.