Fence Post Concrete Calculator
Calculate Concrete for Post Holes
How to use: Enter the diameter and depth of your post hole in inches, and the number of posts. Common fence post holes are 12 inches in diameter and 36 inches deep.
Pro Tip: Dig holes at least 1/3 the height of the above-ground post for stability.
Frequently Asked Questions
How deep should fence post holes be?
Fence post holes should be at least 1/3 the height of the above-ground post. For a 6-foot tall fence, dig holes 24-36 inches deep. In cold climates, dig below the frost line.
How much concrete per fence post?
A standard 12-inch diameter × 36-inch deep post hole requires approximately 2.3 cubic feet of concrete, which equals about 4 bags of 80lb concrete mix.