None.
An inch is a measure of length or distance while a cubic foot is a measure of volume. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid.
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The volume is 36*68*31 = 75,888 cubic inches = 75,888 / (12*12*12) = 43.91667 cubic feet.
31 inches = how many feet and inches 2 feet and 7 inches
Volume = 69" * 33" * 31" = 69*33*31 = 70587 cubic inches = 70587/(12*12*12) = 40.85 cu feet (to 2 dp). But the volume of a fridge is normally the capacity, which is the measure from the inside.
31/12 feet
One foot equals to 12 inches. So divide 31 inches by 12. Then you get 2.58 feet for 31 inches.