I'm not sure I understand what your asking but it works like this:
Your amp or vial of HCG should tell you the total number of IUs in it. However many mls you use to recontitute, divide that number into the total IUs and you'll get IU/ml.
For instance, a 5,000IU vial of HCG reconstituted with 5ml of solvent will yield 1,000IU/ml. It's that simple.