U need 1.63 80lb bags per square ft so 131bags to do 8ft by 8ft
go to any search. and type in concrete calculater
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
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).
how many bags of cement for a pad 4x7x4 inches thick
To determine how many 80-pound bags of concrete are needed to fill an 8-foot by 8-foot by 5-inch thick slab, first calculate the volume of the slab. The volume is 8 ft x 8 ft x (5/12) ft = 26.67 cubic feet. An 80-pound bag of concrete typically yields about 0.6 cubic feet, so you would need approximately 45 bags (26.67 cubic feet ÷ 0.6 cubic feet per bag).
go to any search. and type in concrete calculater
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
how many bags of cement for a pad 4x7x4 inches thick
20
To make one yard of concrete from 80# bags you will need about 40-45 bags. Each bag is about .67 or 2/3 cubic foot. you will need 27 cubic feet to make 1 cubic yard. Cheaper to have a redimix truck deliver, and a lot less work.
According to the related link below; the required amount to cover 1 square yard with 4 inches of concrete is 6.6 60 pounds bags.
The answer will depend on how large and area you want the topping for. Without that information, no sensible answer is possible.
Usually concrete mix comes in 40, 60 or 80 pound bags.
This cannot be answered without knowing the width and depth.
You need 1.16tonne. You need to know the weight of a bag of concrete and then divide 1.16 by that weight and that will give you the answer you need.
18 bags (80 pounds) of quikrete for a 4 inch thick slab.
Typically, one 50-pound bag of concrete is needed per fence post.