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.
259.2593 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.
259.2593 sq. yards.
.617 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=
15.833... [cubic] yards.
There are 7,025,356,800 sq feet in 12x21 square miles.
If you say 2 inches deep, I assume you really mean cubic yards, as in how much you would have to buy? If so, the answer is 7.77, so you would need about 8 yards.