None. A cubic foot is a measure of volume. An inch is a measure of distance. The two measure different things and there is no sensible way to convert one to the other.
3.14 x 12 x 12/4 x 30/12 cu ft x 7.5 gallons per cu ft = 2120 gallons
If you meant cu. in to cu. ft.divide by 1728.
For 1 foot deep, 400 cu ft. For 3 inches deep, 100 cu ft.
To convert cubic inches (cu in) to cubic yards (cu yd), divide the volume in cubic inches by 46,656, since there are 46,656 cubic inches in one cubic yard (1 cu yd = 3 ft x 3 ft x 3 ft = 27 cu ft, and 1 cu ft = 1,728 cu in). The formula is: cu yd = cu in ÷ 46,656. For example, if you have 1,000 cu in, you would calculate 1,000 ÷ 46,656, which equals approximately 0.0214 cu yd.
Multiply by 123 = 1728 ie 1 cu ft = 1728 cu inches.
360 cu ft or if the "4" is inches, not feet, one twelfth of that, ie 30 cu ft
3.14 x 12 x 12/4 x 30/12 cu ft x 7.5 gallons per cu ft = 2120 gallons
There are 1728 cubic inches in 1 cubic foot. To convert cu ft to cu in, multiply cu ft by 1728 (cu in per co ft).1,728 cubic inches per cubic foot.
26 cu ft equals 44,928 cubic inches.
12 inches = 1 ft so 30 inches = 2.5 ft
If the units are 30 ft x 30 ft x 4 inches, then you have 30 x 30 x 0.33 ft = 300 cubic feet300 cubic ft/27 cu yds/cu ft = 11.1 cubic yards
If you meant cu. in to cu. ft.divide by 1728.
54 feet 4 inches
For 1 foot deep, 400 cu ft. For 3 inches deep, 100 cu ft.
To convert cubic inches (cu in) to cubic yards (cu yd), divide the volume in cubic inches by 46,656, since there are 46,656 cubic inches in one cubic yard (1 cu yd = 3 ft x 3 ft x 3 ft = 27 cu ft, and 1 cu ft = 1,728 cu in). The formula is: cu yd = cu in ÷ 46,656. For example, if you have 1,000 cu in, you would calculate 1,000 ÷ 46,656, which equals approximately 0.0214 cu yd.
The answer depends on the thickness of the covering layer.
Multiply by 123 = 1728 ie 1 cu ft = 1728 cu inches.