It is a mobile application, which puts formulas based on the rule of three within the reach of the operator, in order to obtain a quick calculation during the formulation of a pharmacological therapy, for example: Dose to be administered both by mass (mcg and mg) and how much is equivalent in volume of the medicine (ml / cc). It also allows, with the combination of the different variables, to obtain exact data of the patient's weight, the dose used in the patient, which presentation by mass or volume was used keeping in mind exact data at the time of prescription of the medication. In addition, it allows the user to calculate infusions and quantity of medication units to indicate for a complete treatment and medical classification scales.