Formula used
Concrete volume = [π × (diameter ÷ 2)² × height ÷ 27] × (1 + waste ÷ 100), after converting diameter to feet
Worked sonotube example
Sonotube Calculator example: π × (11.9 in ÷ 12 ÷ 2)² × 3 ft = 2.32 ft³. Applying 10% gives 0.09 yd³; round any bag conversion to whole packages.
From calculated volume to an order
Multiply identical piers before ordering and verify the form's actual inside dimensions and the supplier's concrete delivery increment.
Where a concrete takeoff can drift
Belled bases, footings below the tube, cut slope, embedded posts, tube deformation, and concrete left in placement equipment affect quantity.
Questions specific to this calculation
Which diameter and height define the sonotube placement?
Enter the inside diameter of the selected fiber form and the placed concrete height; calculate different form diameters as separate groups.