Calculates the rolled length of a roll of material on two rims. The required dimensions are as given in the table.
Variations due to stretching or softness of the material are to be ignored. The length units that can be used are
yard, feet, inch, meter, centimeter, millimeter and mil. A mil is equal to one thousandth of an inch. The initial
units used in the table can be changed to any of the choices given. Please take note that the distance between the inside rims refers to the distance
between the centers of the rims.
If we initially have the outside length of rolled material we can compute first for the outside diameter of rolled material by subtracting the distance
between centers of inside rims from the outside length of rolled material.