Post Hole Concrete Calculator Calculate how many yards or how many bags of concrete are needed for a set of post holes by entering the post diameter and hole size. Convert the volume to cubic yards from cubic feet. Choose Round Column or Round Slab on the calculator.
Give it a try and then be sure to try out our other calculators as well.
The volume formula for a rectangular or square slab in cubic feet is height ft x width ft x length ft as seen in the figure below. Mark the area that will need concrete and divide it into smaller areas. They are 4 feet in height and 10 inches in width diameter or 4 x 10. Measure the length and width that youd like to cover.