Calculate the exact amount of concrete you need for any project — slabs, driveways, patios, footings, and foundations. Enter your dimensions to get cubic feet and cubic yards.
Concrete volume = Length × Width × Depth (converted to feet). Divide by 27 to get cubic yards (since 1 cubic yard = 27 cubic feet). Concrete is ordered and priced by the cubic yard.
A 10 ft × 20 ft driveway at 4 inches thick: 10 × 20 × (4/12) = 66.67 cubic feet ÷ 27 = 2.47 cubic yards. With 10% buffer, order 2.72 cubic yards.