You can't convert between the two. One is a unit of area, the other a unit of volume.
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sq feet to sq yards cu ft to cu yards you need depth added to your sq ft to get cu ft such as 70 sq ft x 4 in deep = 23.33 cu ft =.086 cu yd
12 in = 1 ft volume = area × depth = 16 sq ft × 2 in = 16 sq ft × (2 ÷ 12) ft = 2⅔ cu ft ≈ 2.67 cu ft
cu ft = sq ft x ft =216 x 1/3 = 72, so cu yds= 72/33 =8/3
depends on how deep you want the nuggets. at 2" (or .17ft) thick: 12 x 16 = 192 sq ft area 192 sq ft x .17ft thick = 32.64 cu ft 32.64 cu ft / 2 cu ft = about 17 bags.
25' x 4' = 100 sq ft. 100 sq ft x 1' = 100 cu ft. 100 cu ft x 2 = 200 cu ft.