Calculate how many bags of Quikrete concrete you need. Enter your project dimensions and bag size to get an accurate estimate with 10% waste factor included.
Project Dimensions
Bag Size
Estimate
The Quikrete Calculator helps you determine exactly how many bags of Quikrete concrete mix you need for your project. Whether you're pouring a slab, setting fence posts, or building a footing, this calculator accounts for project dimensions, bag size, and adds a 10% waste factor for spillage and uneven ground.
You need approximately 45 bags of 80 lb Quikrete per cubic yard of concrete. Each 80 lb bag yields approximately 0.022 cubic yards (0.6 cubic feet) of mixed concrete.
A standard residential concrete slab (patio, walkway) should be 4 inches thick. Driveways should be 5–6 inches, and garage floors should be at least 6 inches. Areas with heavy loads may need 8+ inches with rebar reinforcement.