A rectangle has a perimeter with linear units, and a surface area with square units. It has no cubic units.
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Linear units, like inches, can't be converted to cubic units. If they could, then you'd be able to calculate your height in gallons.
It is: width times length times height measured in cubic units
A rectangle is two dimensional and cannot be cubic, but a three dimensional rectangle ( a rectangular prism ) can be cubic.
The shape in question is not a rectangle but a rectangular prism. Its volume is 12.5*10*8 = 1,000 cubic units.
The area of a rectangle is (length) multiplied by (width). The units don't matter. Just make sure that 'length' and 'width' are both measured in the same unit, whatever the unit is.