Planning concrete footings

Rectangular footing volume is length × width × depth. For round piers, use π × radius² × depth. Multiply by the number of identical footings, convert to cubic yards, and add waste.

Practical considerations

Footing width, depth, reinforcement, bearing area, and frost protection are structural and code questions. Never size a footing from a volume calculator alone. Verify utilities, soil, loads, frost depth, inspection, and permit requirements locally.

Before you order

Measure inside the forms or excavation. For post holes, sample actual diameters and depths because augered holes vary. The calculator accepts feet, inches, mixed feet and inches, meters, and centimeters.

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