Post Hole Concrete Calculator: How Many Bags?
Your numbers
Number of posts
Hole diameter
in
Hole depth
in
At least ⅓ of the post's length, below the frost line where required.
Gravel base in hole
in
Drainage gravel at the bottom; not filled with concrete.
Post size (square)
None / round pipe (ignore)
4×4 (3.5 in)
6×6 (5.5 in)
3×3 or 2.5 in square tube
Extra
%
Calculate
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