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formula for yards of concrete needed. For size 12 inch. Diameter of slab 12 feet depth of slab 4 inches 314159265358979 12 12 4 4 12 11309 0333 377 cubic feet of concrete needed for this circular slab To convert cubic feet to cubic yards multiply cubic feet 0037037037037037.
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Calculate the volume of the area after determining the shape of the area see the chart below by multiplying in the thickness of the concrete. See below for more information. If youre not sure what size hole to dig a rule of thumb is to use a hole diameter 3 times the post diameter and 1 3 as deep as the post height.
Know that the formula for calculating concrete consists of the following.
The steps required for calculating cubic yards for concrete are as follows. Dividing cubic feet by 27 a cubic yard will give you the concrete yardage. The volume for a rectangular space is equal to the length times the width times the height. For size 8 inch.
