Post Hole Concrete Calculator
Calculate Post Hole Concrete
Estimate concrete bags for post holes
Formula
Bags = (π x (Hole Radius)² x Depth - Post Cross Section x Depth) / 1728 / Cu Ft per Bag
Frequently Asked Questions
How many bags of concrete for a 4x4 fence post?
A typical 4x4 fence post in a 10-inch diameter, 36-inch deep hole requires about 3 bags of 80-lb concrete mix, or 4 bags of 60-lb mix.
How deep should a fence post hole be?
A fence post hole should be 1/3 the total post length plus 6 inches for gravel drainage. For a 6-foot fence with 8-foot posts, dig holes 30-36 inches deep.
Should I use fast-setting concrete for fence posts?
Yes, fast-setting concrete is ideal for fence posts. You can pour it dry into the hole and add water, or mix it first. It sets in 20-40 minutes, allowing you to continue building the same day.
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