Construction

Concrete Estimator - Tube

Concrete to fill a round tube form.

Diameter

Height

Number of tubes

Calculated Output

Concrete volume 0.0218

Volume 0.0008

60 lb bags 1

Formula: volume = π (diameter/2)² × height × tubes

Step-by-Step Breakdown

1. Values used:

2. Diameter = 1

3. Height = 1

4. Number of tubes = 4

6. Concrete volume = 0.0218

7. Volume = 0.0008

8. 60 lb bags = Diameter x Height = 1 x 1 = 1

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The math behind it

Each tube is a cylinder: π × radius² × height; multiply by the number of tubes.

Four 10 in × 3 ft tubes → 6.5 ft³.

60 vs 80 lb bags?

A 60 lb bag yields ~0.45 ft³; an 80 lb bag ~0.6 ft³.