Does this size a column or footing?

No. Column dimensions, reinforcing, load design and local requirements require responsible professional review.

Why are quantities rounded up?

Ready-mix ordering and bag purchasing use practical increments; a visible allowance helps reduce a material shortfall.

Concrete calculator

Concrete column

Round concrete-column volume, ready-mix order and bag-equivalent estimate.

Calculator result and formula

Ready-mix order: 0.25 yd³

Formula: π × (diameter ÷ 2)² × height × count ÷ 27 × (1 + waste)

Formula ID: CONC-COLUMN-001 · Version 1.0.0 · Published · Last reviewed Aug 26, 2026.

Inputs

Column diameter: Inside diameter of the form Default: 12.
Column height: Finished concrete height Default: 48.
Number of columns: Count identical round columns Default: 1.
Waste factor: Allowance for placement and site conditions Default: 10.

How this calculator works

This calculator applies the cylinder-volume formula to identical round concrete columns, then shows a ready-mix order and bag-equivalent estimate after allowance.

Measure the inside form diameter and finished concrete height.
Enter the number of identical columns; calculate non-identical columns separately.
Use the rounded result as a supplier-quote starting point and confirm structural requirements independently.

Worked example: Example: one 12 in diameter column at 48 in high contains about 1.16 ft³. With 10% allowance, the ready-mix quantity rounds to 0.25 yd³.

Assumptions and limitations

Each column is treated as a right circular cylinder.
All entered columns are treated as identical.
Ready-mix quantity is rounded to the next 0.25 yd³ after allowance.

Common mistakes to avoid

Confirm the measurement basis and units before using the result.
Keep waste or allowance visible and adjust it for the actual job conditions.
Confirm supplier packaging, delivery increments, specifications, and final site requirements before ordering.

Calculator disclaimer

This planning calculator does not determine structural design, code compliance, installation requirements, or guaranteed pricing. Confirm final requirements with the appropriate responsible professional, authority, manufacturer, and supplier.

Formula review and sources

Internal QA complete · independent external review pending · 1 source reference.

Concrete Network: volume calculation guidance

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