Concrete Pier Calculator

Calculate concrete volume for cylindrical piers and Sonotube footings. Enter diameter, depth, and quantity.

πŸ—οΈ Concrete Pier Calculator

Results

Volume per Pier3.14 cu ft
Total Volume18.8 cu ft
Total Volume0.70 cu yd
80 lb Bags32 bags

πŸ’‘ How to Calculate Concrete Pier Volume

Pier volume uses the cylinder formula: Ο€ Γ— rΒ² Γ— h. Common pier diameters: 8 inches for light loads (fences), 12 inches for deck posts, 18–24 inches for heavy structural loads. Depth must reach below the frost line β€” 36 to 48 inches in most northern climates.

Sonotube cardboard forms make pouring cylindrical piers easy. Set the tube, add rebar (typically 2 vertical #4 bars), pour concrete, and insert a post bracket before the concrete sets. One 80 lb bag of concrete fills about 0.6 cubic feet.

Six 12-inch diameter piers Γ— 48 inches deep: volume each = 3.14 cu ft. Total = 18.8 cu ft = 0.70 cu yd β‰ˆ 32 bags of 80 lb concrete.

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