Fence post concrete calculator
PROBags of concrete for fence post holes.
Inputs
Result
Cubic feet total
14.2
50 lb bags
38
80 lb bags
24
The formula
Volume per hole = π × (d/2)² × depth. 50 lb bag ≈ 0.375 cu ft.
Worked example
13 posts × 10" × 24" hole ≈ 14 cu ft = 38 × 50 lb bags.
Frequently asked
›Diameter rule?
Post hole should be 3× the post width.