A 40 lb. bag of soil containing 2 cu.ft.3 will cover 25 sq.ft. @ 1" inch deep. My guess then would be 4 or more -40lb. bags would take care of 24 sq.ft. 4" deep.
.21 yards of sand will fill an area 115 inches by 67 inches to a depth of 2.5 inches.
about 432 cubic inches
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 43 bags. Dry sand weighs ABOUT 100 lbs per cubic foot- and you need 21.3 cubic feet.
22/7x6x6x6 cubic inches
To fill a 10-inch diameter sonotube that is 4 feet deep, you'll need to calculate the volume of the tube. The formula for the volume of a cylinder is V = πr²h. The radius is 5 inches (0.417 feet), so the volume is approximately 0.544 cubic feet. A typical bag of concrete (60 lbs) yields about 0.45 cubic feet, meaning you'll need about 1.2 bags of concrete to fill the sonotube completely. Therefore, you should plan on purchasing 2 bags to ensure you have enough material.
6,400 ft3
To calculate the volume of the space, multiply the dimensions: 18 ft × 18 ft × 8 ft = 2,592 cubic feet. An 80 lb bag of Quikrete typically fills about 0.6 cubic feet. Therefore, to find the number of bags needed, divide the total volume by the volume per bag: 2,592 cubic feet ÷ 0.6 cubic feet/bag = 4,320 bags. You will need approximately 4,320 bags of Quikrete to fill the space.
509.7 litres
To convert the weight of the sand into a volume and find out how much you need you would need to know the density of the sand as the more dense it is the less sand there will be in a 50lb bag and the more bags you would then need to fill the yard
29.45 cubic feet or 183.45 US gallons.
259.2593 sq. yards.