Enter your project dimensions and instantly see how many 80 lb or 60 lb bags of concrete you need. The calculator includes a 10% waste buffer and also tells you when ordering ready-mix concrete by the yard is the smarter choice for larger pours.
An 80 lb bag yields approximately 0.45 cubic feet. A 60 lb bag yields approximately 0.34 cubic feet. Projects over half a cubic yard (roughly 20 bags of 80 lb mix) typically benefit from ready-mix delivery.