Concrete Calculator
Free concrete calculator: enter slab, square footing or round pier dimensions to get cubic yards needed (with 10% waste allowance) and exactly how many 80, 60 or 40 lb bags to buy. Instant, free, private.
Bag yields used: 80 lb bag = 0.60 ft³, 60 lb bag = 0.45 ft³, 40 lb bag = 0.30 ft³. Results include a 10% waste allowance — always round up when ordering.