Concrete Cylinder Calculator

Your details

The outer diameter of the cylinder (for hollow cylinders, use the solid outer diameter and enter the inner diameter separately).
in
The total height or depth of the cylinder. For a footing or column, this is the full depth from top to bottom.
in
Multiply the result for multiple identical columns or posts.
cylinders
Enable if you need to subtract an inner void (e.g., concrete around a pipe).
Add extra material to account for spillage, uneven surfaces, and leftover mix. 10% is a common allowance.
%
Standard pre-mix concrete bags. An 80 lb bag yields about 0.60 ft³ of mixed concrete.
Normal-weight concrete is typically 2300-2400 kg/m³ (144-150 lb/ft³). Lightweight mixes are around 1800 kg/m³.
kg/m³
Volume (net)
0.089m³

Net concrete volume of all cylinders combined (no waste)

Volume with waste0.0979m³
Volume (ft³)3.142ft³
Volume (yd³)0.1164yd³
Weight (kg)213.5kg
Weight (lb)470.7lb
Bags needed6bags
Base area0.073m²
Lateral surface area1.1675m²
Total surface area1.3134m²
Base area (m²)0.073
Lateral area (m²)1.1675

One 12 in diameter cylinder needs 0.0890 m³ of concrete.

  • You will need 6 x 80 lb bags of pre-mix concrete (including the 10% waste allowance).
  • At 0.116 yd³, bagged pre-mix is the practical choice. Ready-mix trucks typically have a 1 yd³ minimum.

Next stepPick up the bags and a rented mixer for larger quantities. For small volumes, a hand-mixing trough works fine.

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