During a software project lifecycle, the estimation of cost, effort, and schedule are essential aspects since they are used to allocate resources, plan product releases, and negotiate payments. It has been demonstrated that the dominant variable to estimate these aspects is the software functional size. One of the methods to measure software is COSMIC (ISO/IEC 19761). The COSMIC organization has published guidelines to help the measurement process for some types of software applications like real-time software, SOA, business applications, etc. However, there is a lack of information on how to measure some new or trending technologies. One of these trending technologies is Robotic Process Automation, also known as RPA. Even though the RPA market has been growing rapidly, there has not been an approach of using formal metrics to measure this kind of software. This paper illustrates the process of measuring an RPA software using the COSMIC method.