Sono Tube Concrete Calculator

The Sono Tube Concrete Calculator computes the exact concrete needed for cylindrical footings, deck piers, and fence posts. Instead of manual geometric math, enter your tube diameter in inches, depth in feet, and total quantity to instantly receive volume totals in cubic feet, cubic yards, and standard 80-lb bags.

How to Calculate

Measure the inside tube diameter in inches.
Enter the height or hole depth in feet.
Enter your total tube quantity.

Worked Example

Pouring one 12-inch diameter tube that stands 4 feet deep:

Radius: 12 / 2 = 6 inches = 0.5 feet
Cubic Feet: π × 0.5² × 4 ≈ 3.14 cu ft
Cubic Yards: 3.14 / 27 ≈ 0.12 cu yd
80-lb Bags: At 0.60 cu ft yield per bag, 3.14 / 0.60 = 5.23 bags (purchase 6 bags).

Always add 10% extra to your final order to account for soil displacement and pouring spillage.

Frequently asked questions

How much concrete does an 80-lb bag yield?

A standard 80-lb bag of premixed concrete yields approximately 0.60 cubic feet (or 0.022 cubic yards) when mixed.

When should I use ready-mix instead of bags?

If your project requires more than 1 cubic yard (roughly 45 eighty-pound bags), ordering a ready-mix truck typically saves significant time and physical labor.

How deep should sono tube footings be set?

Sono tubes must be placed at least 6 inches below your local frost line to prevent frost heave, or to solid bearing soil per local code.