To many!
An 80lb bag of concrete you can at your local home improvement store covers about 4 square foot at 2" thick. So you would need about 144 bags of 80lb concrete.
50lb bags 3.7 60lb bags 3.1 80lb bags 2.3 90lb bags 2.1 These amounts are for using the redi-mix bags.
about 17 yards of concrete (it's sold by the cubic yard)
That depends on how DEEP you want the concrete !
5 yds - One yard of concrete will cover approximately 81 square feet 4" deep.
An 80lb bag of concrete you can at your local home improvement store covers about 4 square foot at 2" thick. So you would need about 144 bags of 80lb concrete.
There is no way to answer that without knowing how deep the concrete will be.
4.4 bags for each 1-foot deep. 2.2 bags for each 6-inches deep. Each 5-ft3 bag will cover the area to 2.72 inches deep.
50lb bags 3.7 60lb bags 3.1 80lb bags 2.3 90lb bags 2.1 These amounts are for using the redi-mix bags.
54sqare feet
16 bags for every 3 inches deep
12.3 bags for every 2 inches deep. (rounded)
6
You need (182/3) divided by (cubic feet of mulch in each bag) bags.
How deep? Are you talking about dry mix weight or finished weight? Concrete weighs 150 pounds per cubic foot. So if you have a 6" slab, that's 150# for 2 square feet. For a 4" slab, the same amount will cover 3 square feet. For a 3" slab, 4 square feet. Concrete mix is commonly sold in 80 pound bags. The finished weight is the mix plus the water that gets chemically bound to it. There's a guide on the bag telling how many bags you need for a given area and thickness.
If it is the same as concrete it will cover 162 square feet. concrete covers 81 square feet by 4" deep
9.72 Cubic Yards of Concrete is required, if you are going to order by cement truck. 874.8 bags of 40# (40 lbs) bags, or 583.2 bags of 60# 437.4 bags of 80#