Calculate concrete for a patio or walkway. Enter the length, width, and thickness to get cubic yards, cubic feet, 80 lb and 60 lb bag counts, rebar sticks, and gravel sub-base tonnage. Includes a 10% waste buffer built in.
Standard residential patios use 4-inch concrete for foot traffic. Increase to 6 inches if vehicles will access the area or if you want added durability. A 12 ft × 20 ft patio at 4 inches requires approximately 3 cubic yards.