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Concrete column

Estimate concrete volume and bags for round or square columns.

Built and maintained by The NumberPrism Editorial TeamEditorial policy

Your details

Column shape

Diameter or width (in)

Column height (ft)

Number of columns

Bag size

Results update as you type. The formula and assumptions are explained below the calculator.

Total concrete volume

0.32 cu yd

Volume per column7.85 cu ft

Total with 10% waste8.6 cu ft

Bags of ready-mix15 × 80 lb

Approximate weight1,296 lb

Volume excludes the footing and formwork. Round columns use the formed diameter, so measure the inside of the tube rather than the finished surface.

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What does this tool do?

Column volume is the cross-sectional area multiplied by the height. This calculator handles round and square columns, adds a 10% waste allowance and converts the total into bags of ready-mix.

The Formula

Round volume = π ÷ 4 × (Diameter ÷ 12)² × Height; Square volume = (Width ÷ 12)² × Height

Frequently Asked Questions

How much concrete is in a 12 in column?

A 12 in round column 10 ft tall holds about 7.85 cu ft, or roughly 15 bags of 80 lb mix with waste.

Does the calculator include the footing?

No. Footings are calculated separately as rectangular volumes and should be added to the column order.

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