how many cubic yards is an 80 lb bag of concrete
1 Pre-mix concrete comes in bags that are 60 lbs. and 80 lbs. 2  A 60 lb. bag provides 0.45 cubic feet of cured concrete. 3  A 80 lb. bag provides 0.6 cubic feet of cured concrete. 4  If you have concrete delivered it is sold by the yard (which is a cubic yard &equals; 27 cubic feet).