Concrete Calculator
So enter in the footing calculator, 6″ depth by 12″ width (always figure steps with a 12″ width) by 9′ length. This totals .17 cubic yards. The total concrete needed for the 3′ by 3′ porch will be .28 cubic yards. (.11 + .17 cubic yards = .28 cubic yards) Repeat this for added layers of steps. 3′ x 3′ Porch.
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