how deep?
10 bags will give you 6'2/3", seven bags will give you 11 bags will give you 7'1/3". Each bag is 2/3 cu feet.
If your talking about 4'x4'x4" thick it will take about 12 bags. Most 60# bags will do .45 cubic feet and that slab would be about 5.3 cubic feet wich equals 11.77 bags.. Mike
Cubic feet needed is the thickness is 4 inches:416Cubic yards:15.3660 pound bags92580 pound bags 694
go to any search. and type in concrete calculater
Your slab is slightly over 40 cubic feet. Home Depot sells a 60 pound redi-mix bag which contains 1/2 cubic foot. You will need at least 80 bags. You will need slightly more (maybe 90-100) if you dig you area under the slab unevenly or too deep.
Depending on the size, bags of ice can be from $1.00 up.
Quikrete is sold in 60 pound bags, therefore we will need 1.5 bags. Each 60 pound bag produces 0.45 cubic feet, so times 1.5; 90# bag will yield 0.675 cubic feet .
That would depend on the density of the bags of topsoil.
3 feet
10 bags will give you 6'2/3", seven bags will give you 11 bags will give you 7'1/3". Each bag is 2/3 cu feet.
To what depth?
3 feet.
21 feet
3 feet.
If your talking about 4'x4'x4" thick it will take about 12 bags. Most 60# bags will do .45 cubic feet and that slab would be about 5.3 cubic feet wich equals 11.77 bags.. Mike
40 feet/50 feet
5 and 10