How many yards of loam will I need to cover an area of 400sq. ft. with 3 inches of loam?

3.7 yards of loam

Its like this for a break down. 20' x 20' = 400sq ft. Now to inches 20'x 12" is 240 "

240"x240" =57,600 sq inch x 3" =172,800 cubic inches divided by 46,656 cubic inches in a yard

172,800 divided by 46,656 = 3.7 yards

Weight of Dry Loam is 78 lbs to a Cubic ft