Figuring your needed amount of concrete for a project is the easy part. Forming, pouring, and finishing the concrete is the hard part. Most slabs are poured at 4 inches thick. You take the length of the formed area and multiply that by the width. Take that total and multiply it by .33 and divide that total by 27 for the number of yards of concrete you will need to pour the slab.
W x L x .33 / 27 = total yards of concrete needed at 4 inches thick.
6 inches thick- W x L x .49 / 27 = Total Yards Of Concrete.
8 inches thick W x L x .66 / 27 = Total Yards Of Concrete.
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