Degrees or inches is definitely important. One other thing, conversion of degrees to inches is not as straight forward as might be implied above. You need to know where the toe angle is measured (the tire tread or the rim) and the overall diameter of the tire or rim. (formulas courtesy of the enginerds at miata.net)
Example: lets say the alignment results in .30 degrees of toe. And for sake of argument the tire is 24 inches in diameter on a 14 inch wheel:
For a toe angle measured at the tire tread:
.30x24/55(a constant)= .13"
if measured at the wheel: