You cannot. A cubic inch is a measure of volume in 3-dimensional space, whereas a foot is a measure of distance in 1-dimensional space. The two measure different things and, according to the basic rules of dimensional analysis, conversion from one to the other is not valid.
You can't really convert a unit of length into a unit of volume. However, if you want to convert cubic feet into cubic inches, multiply by 12 three times (or, in other words, multiply the number by 1728).
2.5 cubic feet = 4,320 cubic inches
1.2 (cubic feet) = 2073.6 cubic inches FYI: Google "convert 1.2 cubic feet to cubic inches"
There are about 8,640 cubic inches in five cubic feet.
2.78 cubic feet in 4,800 cubic inches.
345,600 cubic inches are in 200 cubic feet.
There are no inches in a cubic foot, but there are 1,728 cubic inches.1 cubic foot = 1,728 cubic inches9 cubic feet = 15,552 cubic inches
1,070 cubic inches is 0.6192 cubic feet.
1.4 cubic feet = 2,419.2 cubic inches.
54,600 cubic inches = 31.6 cubic feet
16 cubic feet = 27,648 cubic inches
1 cubic feet = 1728 cubic inches 1.1 cubic feet = 1.1 x 1728 cubic inches = 1900.8 cubic inches