How much concrete do you need for a 24 X 24 by 6 slab?

I'm assuming 24ft X 24ft 6in thick if so you have 10.67 cubic yards so what you need would be 40lb bags would take 961 60lbs would take 641 and 80lb bags would take 481 most concrete places I think only require atleast two to three yard order so I'd go that route make it easier. I'd call and order 11 cubic yards hope this helps