0.5 is one-half, it takes 2 of these to make one cubic foot.
I'll use the density of dry, packed sand, which is 100 lbs per cubic foot, 50/100 is 2 50 lb bags of sand
Figure about 1/2 cubic foot per 60 lb bag. The basic formula is to use equal amounts of cement, sand, and gravel. There are 27 cubic yards per cubic foot. It depends upon how thick you are planning to pour the concrete. For one foot thick, you would need 9 cubic feet of concrete. For 6" thick, you would need 4 1/2 cubic feet. I'll give you the answers for 1 ft thick and for 6" thick. For 1 foot thick, you need 9 cubic feet at 1/2 cubic foot per 60 lb bag equals 18-60 lb bags. That's six 60 lb bags of concrete, plus six 60 lb bags of sand, plus 360 lbs of gravel. For 6 inches thick, divide each of these by 2 to give 3-60 lb bags of concrete, 3-60 lb bags of sand, plus 180 lbs of gravel.
Each 60 pounds bag of ready mix concrete will make .45 cubic foot of concrete. There are 27 cubic feet in a cubic yard. You will need 60 bags of 60 pound premixed concrete to make 1 cubic yard.
Most bags will make a 1/3 of a cubic foot of concrete.
Sand bags or gravel
0.02832 cubic meters per cubic foot.
You need10.8/(the number of cubic feet of sand in each bag) bags.
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.
about 60 60lb bags
i would take about 54 40 pound bags to make a cubic yard each 40 pound bag is about 1/2 a cubic foot and there are 27 cubic feet per cubic yard.
A good average density for topsoil is 100 pounds per cubic foot. There are 27 cubic feet in one cubic yard, and so one cubic yard weighs around 2,700 pounds.2,700/40 = 67.5Therefore, it will take about 67.5 forty pound bags to make one cubic yard of topsoil.
You cannot make a direct conversion. You need to specify how deep you want the gravel to be in your area that needs covering.