Construction

Hole Volume Calculator

Concrete needed to fill round post holes.

Hole diameter

Hole depth

Number of holes

Calculated Output

Concrete volume 0.0327

Volume 0.0012

60 lb bags (bags) 1

Formula: volume = π (diameter/2)² × depth × holes

Step-by-Step Breakdown

1. Values used:

2. Hole diameter = 1

3. Hole depth = 1

4. Number of holes = 6

6. Concrete volume = 0.0327

7. Volume = 0.0012

8. 60 lb bags = Hole diameter x Hole depth = 1 x 1 = 1bags

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The math behind it

Each hole is a cylinder: π × radius² × depth; multiply by the number of holes.

6 holes, 10 in across, 3 ft deep → ~9.8 ft³.

Subtract the post?

For accuracy, subtract the post's buried volume; ignoring it adds a small safety margin.