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.
.617 Yards
259.2593 sq. yards.
Three acres three inches deep is 403.33 cubic yards.
40.1 cubic yards
2.2222222 cu. yards
3,456 cubic yd.
.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.
12 feet X 21 feet / 9 sq feet/sq yard = 28 sq yards
There are 12 inches in a foot. 12x21=252 inches Tip: Google will multiply numbers with a * between them 12*21=
You would need 31.88 cubic yards of topsoil to cover 855 sq feet at 6 inches deep.
There are 7,025,356,800 sq feet in 12x21 square miles.
.21 yards of sand will fill an area 115 inches by 67 inches to a depth of 2.5 inches.