Sonotube Concrete Calculator

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Construction

Calculate the volume of concrete needed to fill a cylindrical sonotube form.

Formula

V = π × r² × depth; 60 lb bag ≈ 0.45 cu ft; 80 lb bag ≈ 0.60 cu ft
  • Common Sonotube diameters: 8, 10, 12, 14, 16 in.
  • Depth should be below frost line (varies by region: 12–72 in).
  • Add 10% to account for irregular holes and spillage.

12 in diameter, 48 in deep, 4 tubes

Inputs
  • Sonotube Diameter: 12 in
  • Depth: 48 in
  • Number of Tubes: 4 tubes

Per tube: π × (0.5)² × 4 = 3.14 cu ft. 4 tubes = 12.57 cu ft → 28 bags (60 lb).

Frequently asked questions

What strength concrete for deck footings?
Use minimum 3,500 psi concrete for footings in cold climates. Quikrete 5000 or equivalent. Consider fiber-reinforced mix for crack resistance.