There are 9 CU FT in a yard....and if this is stated in feet, then take your measurement of 12x21 feet or 252 square feet times (7 inches/12 inches or .5833333 feet) to give you 147 Cubic feet , then divide by 9 CUFT/YD or 16.3333 Cu Yards....about two standard mixer loads
Three acres three inches deep is 403.33 cubic yards.
2.2222222 cu. yards
3,456 cubic yd.
12 feet X 21 feet / 9 sq feet/sq yard = 28 sq yards
.617 Yards
Three acres three inches deep is 403.33 cubic yards.
40.1 cubic yards
2.2222222 cu. yards
3,456 cubic yd.
12 feet X 21 feet / 9 sq feet/sq yard = 28 sq yards
.617 Yards
259.2593 sq. yards.
6 inches = 1/6 yards. So 70 sq yards * 6 inches = 70*1/6 cubic yards = 11.66... cubic yards.
There are 12 inches in a foot. 12x21=252 inches Tip: Google will multiply numbers with a * between them 12*21=
There are 7,025,356,800 sq feet in 12x21 square miles.
You would need 31.88 cubic yards of topsoil to cover 855 sq feet at 6 inches deep.
.21 yards of sand will fill an area 115 inches by 67 inches to a depth of 2.5 inches.