I’m not entirely new to sacks of concrete, but I have waaaaay miscalculated today. My guess is 3 small sacks per hole. I get a U-Haul, rent a mixer, bring it all home and go through 14 sacks for each of my first two holes. Back to Lowe’s, take a ribbing from the forklift guy who loaded me up the first time (with thirty 40-lb sacks) as he’s loading me up the second time (forty-two 80-lb sacks.)
Maybe I thought it magically expanded or something.