With GST, rate calculations for Pharma Stockist and Pharma Retailers have been changed. Below PCD Calculator will give you a general idea of how to calculate retail and stockist margins. Here PTR means Price to Retailer and PTS means Price to Stockist. You can also calculate the net scheme. For example, if you want to give a scheme like 10% then this calculator automatically calculates the net scheme value according to the percentage you entered.