4 cubic yards is 108 cubic feet.
If you were pouring a concrete sidewalk that was 6" thick and 4 ' wide.
it would be 54' long.
If you wanted to topdress a lawn with loam, guessing an average coverage of 4".
It will cover an area about about 16' x 20'
With an average coverage of 2" it will do an area roughly 32' x 32'.
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19.38 cubic yards. Round up to at least 20 yards.
This is a volume calculation. I assume the dimension for the "6" is inches? If so, the volume= 20x20x0.5= 200 cubic ft.= 7.4 cubic yards
You need to know how much area you are covering and how thick you want the mulch to be. Roughly 3 inches thick is good enough. That is 3/12 = 0.25 feet thick Take area in square feet times thickness in feet, which gives a volume in cubic feet, then divide by 27 to covert to cubic yards For example, if you want to mulch an an area that is 75 feet long and 5 feet wide, the volume is 75 x 5 x .25 = 93.75 cu ft 93.75/27 = 3.5 yards (3 and 1/2 yards)
1 cubic yard = 27 cubic feet6 inches = 1/2 footVolume of the ditch = (12 x 78 x 1/2) = 468 cubic feet = 17 1/3 cubic yards
27 cubic feet = 1 cubic yard 16' x 16' x 6' = 1,536 cubic feet = 568/9 cubic yards