Cubic feet is a measure of volume (i.e. a cube measuring one foot x one foot x one foot). Pounds is a measure of weight (mass). Therefore the relationship between cubic feet and pounds is called density (lbs per cubic foot) and will vary for each substance: a gas (at atmospheric pressure) will have less than one pound per cubic foot, while a block of wood will have a density of approximately 60 lbs per cubic foot.
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If you meant cu. in to cu. ft.divide by 1728.
3.141579265
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
25' x 4' = 100 sq ft. 100 sq ft x 1' = 100 cu ft. 100 cu ft x 2 = 200 cu ft.
There is no conversion. "Cu ft" is a volume measurement, "kg" is a mass measurement.