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
go to any search. and type in concrete calculater
To calculate the number of 80-pound bags of concrete needed for a 2x2 slab that is 6 inches thick, first determine the volume of the slab. The volume is 2 feet x 2 feet x 0.5 feet (6 inches) = 2 cubic feet. An 80-pound bag of concrete typically yields about 0.6 cubic feet. Therefore, you would need approximately 4 bags (2 cubic feet ÷ 0.6 cubic feet per bag = about 3.33 bags, rounded up to 4).
About 162sf.
10 yards
7.1
go to any search. and type in concrete calculater
The concrete typically used for driveway construction is around 4 inches thick.
Concrete driveways are no less than 3.5 inches to 4.5 inches.
A concrete driveway should be at least 4 inches thick to ensure durability and longevity.
4 To 6 inches
A British pound coin is 22.5 millimetres in diameter (0.89 inches) and is 3.15 millimetres thick (0.124 inches).
90 sq yds at 4" thick.
81
About 162sf.
55
should be at lest 4 inches
10 yards