A cubic foot that is three inches thick covers an area of 4 square feet. This is an area, with dimensions [L2]. A linear foot is a measure of distance, with dimensions [L]. There is no sensible way to convert one to the other.
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Not enough information. You would need to multiply three linear measurements to get a volume.
Cubic inches in a box = volume of box (in cubic inches) = Length * Breadth * Height, where each of these three is given in inches.
Three acres three inches deep is 403.33 cubic yards.
A linear unit is used to measure length or distance whereas a cubic unit is used to measure volumes. A cubic unit may defined as a cubic measure (eg a litre) or it could be composed of three linear units (eg cubic centimetre), or a square unit and a linear one (acre-foot). This last combination is rare in the SI system because the linear units are more easily linked to square and cubic units.
1 cubic foot = (12 x 12 x 12) = 1,728 cubic inches3 cubic feet = (3 x 1,728) = 5,184 cubic inches