Formula used
Concrete volume = [π × (diameter ÷ 2)² × height ÷ 27] × (1 + waste ÷ 100), after converting diameter to feet
Worked concrete column example
Concrete Column Calculator example: π × (16.4 in ÷ 12 ÷ 2)² × 3 ft = 4.4 ft³. Applying 10% gives 0.18 yd³; round any bag conversion to whole packages.
From calculated volume to an order
The cubic-yard result is suitable for a concrete takeoff; bag counts are a packaging conversion for small work, not a mix-design instruction.
Where a concrete takeoff can drift
Base enlargements, reinforcing congestion, displaced volume, form tolerances, and concrete left in the chute can alter the placed amount.
Questions specific to this calculation
Which diameter and height define the concrete column placement?
Use the actual inside diameter of the round form and the poured height. Multiply the result outside the tool when several columns share identical dimensions.