Figure concrete and bags for setting fence posts.
Each cylindrical post hole is treated as a cylinder, summed over all posts, and converted into ready-mix bags. Post holes need concrete below the frost line to stay plumb, and bag logging keeps the finishing count accurate.
Concrete Post
Hole = pi x (diameter/2)^2 x depth; each bag yields 0.6 cu ft
Hole = pi x (diameter/2)^2 x depth; each bag yields 0.6 cu ft Each cylindrical post hole is treated as a cylinder, summed over all posts, and converted into ready-mix bags.
Post holes need concrete below the frost line to stay plumb, and bag logging keeps the finishing count accurate.
This calculator takes 4 inputs: Number of posts, Hole depth, Hole diameter, Price per bag. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.