Concrete Footing Calculators

Footings carry everything above them, and both common shapes are easy to estimate wrong: the continuous strip below a wall, and the round piers that hold decks and porch posts. The footing calculators here take strip length × width × depth, or tube diameter × height × pier count, and return cubic yards plus the bag count for small pours.

Depths below the frost line and widths from your local code take priority over any estimate — run the required dimensions through the calculators, not the other way round.