How Much Concrete for a 12×20 Patio?

A 12×20-foot patio poured 4 inches thick needs about 3.11 cubic yards of concrete (roughly 140 eighty-pound bags), with a small waste allowance. For a pour this size, ready-mix delivery is usually cheaper and easier than mixing bags. The calculator below is pre-filled with these numbers — change the thickness or dimensions to match your project.

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