Column Calculator

Calculate concrete volume for round or square columns and pier footings. Get results per column and totals in cubic feet, cubic yards, and bag counts.

πŸ›οΈ Column / Pier Calculator

Results

Volume (each)3.14 cu ft
Total Volume12.57 cu ft
Total Volume0.47 cu yd
60 lb Bags28 bags
80 lb Bags21 bags

πŸ’‘ How to Calculate Concrete Column Volume

Round columns (Sonotubes) use the cylinder formula: Ο€ Γ— radiusΒ² Γ— height. Square columns simply multiply side Γ— side Γ— height. Common residential applications include deck piers (8–12 inch diameter), porch columns (12–18 inch), and structural piers (18–24 inch).

Sonotube forms are available in diameters from 6 to 48 inches. For frost-protected foundations, pier depth must extend below the frost line β€” typically 36–48 inches in northern climates. Most jurisdictions require a footing pad at the bottom that's wider than the column.

Four 12-inch round piers at 48 inches deep: volume per pier = Ο€ Γ— 0.5Β² Γ— 4 = 3.14 cu ft. Total = 12.57 cu ft = 0.47 cu yd β‰ˆ 21 bags of 80 lb concrete.

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