Sonotube Concrete Calculator

Estimate concrete volume for cylindrical sonotube forms with a waste factor and quick 80-lb bag estimate. For standard post holes, use the post hole concrete calculator, and see the footing depth guide for depth guidance.

Inputs

Tip: For small pours, waste of 5–10% is common. For irregular holes or added embedment, consider 10–15%.

Results

Concrete volume
0.13 yd³
3.46 ft³ • 0.1 m³
80-lb bags (rough)
5.76
Assumes ~0.6 ft³ yield per 80-lb bag (varies by mix).

Assumptions

  • Volume based on a perfect cylinder using inside diameter.
  • Waste factor adds extra volume for spillage and form variation.
  • Bag yield is an approximation; check your product label.

Example

A 12 in diameter sonotube poured to 48 inches with 10% waste is 0.13 yd³ of concrete. Multiply the result by the number of tubes you are setting.

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