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To calculate the volume of concrete you need, you must measure the surface area of the slab and multiply this by the thickness of the slab. You usually measure the length and width of the slab in feet, thus giving you a value for area in square feet when you multiply them, but you usually measure thickness in inches.
In the example, 1507.2 divided by 1728=.87 cubic foot of volume per hole. Multiply the volume in cubic feet per hole by the number of post holes to determine the total volume of concrete necessary for the project.For example, a 100 hole project using the example hole would require 87 cubic feet of concrete. Purchase enough bags of concrete to fill the project according to the calculations.ultiply the volume in cubic feet per hole by the number of post holes to determine the total volume of concrete necessary for the project.