Concrete bag yield by size — cubic feet per bag and bags per cubic yard
Bar height is each bag’s yield in cubic feet (40 lb ≈ 0.30, 50 lb ≈ 0.375, 60 lb ≈ 0.45, 80 lb ≈ 0.60). Since a cubic yard is 27 ft³, it takes 90 / 72 / 60 / 45 bags respectively — a bigger bag means fewer bags.
What this diagram shows
A bar chart of four standard concrete bag sizes whose bar height shows the per-bag yield in cubic feet: a 40-pound bag yields about 0.30 cubic feet, a 50-pound bag about 0.375, a 60-pound bag about 0.45, and an 80-pound bag about 0.60. Because a cubic yard is 27 cubic feet, the number of bags per cubic yard is 27 divided by the yield: 90 bags of 40 pound, 72 of 50 pound, 60 of 60 pound, and 45 of 80 pound. A bigger bag yields more, so fewer are needed to fill a yard.
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Bags of Concrete Calculator
How many bags of concrete do you need? Free calculator for 40, 50, 60 & 80 lb bags for a slab, footing, or post holes — plus a bags-to-yards converter.
