Abstract: A method may enable a benefits consultant or other user to quantitatively compare competing PBM formularies across a representative sample of all drugs covered under a health benefits plan to present a comprehensive analysis of the formulary and its influence on a client's net cost. The method may determine a client's utilization data under the client's current formulary schedule. Also, it may determine a pharmacy benefits manager's (PBM) book of business utilization data under the PBM's formulary schedule. Further, the method may determine the utilization differences between the client's utilization data under the current formulary and the PBM's book of business utilization data under the PBM's formulary. Using the client and PBM utilization differences, the method may extrapolate a projected total cost for the client under the PBM's formulary.