Concrete slab planning

A slab estimate starts with length × width × thickness. Convert thickness from inches to feet, divide cubic feet by 27, then add a realistic waste allowance.

Practical considerations

Typical patios and walkways often use a 4-inch slab, while driveways and heavy loads may require more. Soil, drainage, frost, reinforcement, joints, and local code can change the design. Compact a suitable granular base and confirm requirements before pouring.

Before you order

Measure several points when the excavation varies. Plan control joints, access, finishing time, and enough labor before ordering. Use the calculator for material planning, then confirm structural details with a qualified local professional.

Open the concrete calculator to estimate volume, bags, waste, and approximate material cost.