1 cu yd = 27 cu ft = 46656 cu in
A rectangular box measuring 7 x 18 x (40 x 12) = 60480 cu in
60480 cu in = 60480/46656 = 1.2963 cu yd (4 dp)
1,000,000 cubic yards.
Three acres three inches deep is 403.33 cubic yards.
3,495.6 cubic yards.
You would need approximately 2.5 cubic yards of gravel to cover a 12' by 15' area at a depth of 2 inches.
24 cubic feet = 0.89 cubic yards
162 cubic feet
1.851852 cubic yards
13.1 cubic yards, approx.
5.6 acres*3.5ft = 27104 sq yards*1.166... yards = 31621.33... cubic yards.
It takes 5.0926 cubic yards or 137.5 cubic feet.
If it is 4 inches deep/thick, 2 cubic yards. If it is 6 inches deep/thick, 3 cubic yards.
6 inches = 1/6 yards. So 70 sq yards * 6 inches = 70*1/6 cubic yards = 11.66... cubic yards.