Construction

Concrete Column Calculator

Volume and bags of concrete for round columns or tube footings.

Diameter

Height

Number of columns

Waste (%)

Calculated Output

Concrete volume 0.256

Concrete volume 6.912

80 lb bags (bags) 12

Formula: volume = π × (diameter/2)² × height × quantity

Step-by-Step Breakdown

1. Values used:

2. Diameter = 12

3. Height = 8

4. Number of columns = 1

5. Waste = 10 %

7. Concrete volume = 0.256

8. Concrete volume = 6.912

9. 80 lb bags = 12bags

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The math behind it

A column is a cylinder: volume = π × radius² × height. The diameter (inches) is halved and converted to feet.

Multiply by the number of columns and add waste; convert to cubic yards (÷27) or bags.

One 12 in × 8 ft column → π × 0.5² × 8 = 6.28 ft³ (≈11 × 80 lb bags with waste).

What is a Sonotube?

A waxed cardboard tube used as a one-time form to pour round concrete columns and footings.