Concrete & Masonry

Concrete Column Calculator: Round Column Volume & Bags

Calculate the volume of repeated round concrete columns or piers from measured diameter and height without approximating them as square posts.

Maintained by Home Measure Lab Editorial TeamUpdated August 28, 2026Method & corrections

Project measurements

Change the defaults to match your project and the product you plan to buy.

Project result

Your round-column concrete plan

See one-column volume, repeated total, extra allowance, cubic yards and premix bag references.

Planning estimate only. Verify product coverage, package size, supplier specifications and project requirements before purchasing.

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Methodology

Formula & assumptions

Radius

diameter ÷ 2

Converted to feet internally.

One column

π × radius² × height

Cylinder volume.

Repeated columns

one-column volume × quantity

Equal columns only.

Planned volume

base volume × (1 + extra %)

Then converted to bulk/bag units.

How to measure this project

Measure the finished concrete diameter and height for one column or pier, then use the quantity field only when all columns share those dimensions. Keep footings, caps and bell-shaped bases as separate volumes. If a cardboard form is specified by nominal diameter, confirm its actual inside dimension when precision matters.

Before you buy materials

Volume does not determine structural capacity. Use the quantity only after column dimensions, reinforcement and foundations are established by the project requirements. Check bag yields, ready-mix minimums and placement access. For large columns, compare the cubic-yard result with supplier practices rather than relying only on bag counts.

Reference

Concrete Column reference

Planning item	Starting point	Verify / adjust
Cylinder	πr²h	Use concrete inside diameter.
Quantity	Equal columns only	Different sizes need separate runs.
Footings/caps	Not included	Calculate separately.
Structure	Quantity only	Design/reinforcement is outside scope.

Questions

Frequently asked questions

Does this include the footing below a column?

No. Footings, caps and enlarged bases should be calculated separately.

Can this size a structural column?

No. It only calculates concrete quantity from dimensions you supply.

What if my columns have different heights?

Calculate each height group separately rather than using one quantity for unlike columns.

Next step

Keep this project moving

Follow the measurement into the most useful related reference, calculator or project view.

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Planning guides

Understand the inputs behind this calculator

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Concrete

Round Concrete Column and Pier Volume

Calculate cylinder volume for round concrete columns or piers and keep footings, caps and structural design separate.

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