This paper analyzes a functional model of business analytics achieved using BI (Business Intelligence) tools to improve sales activities. The introductory section outlines the subject and objectives of the research, lists data sources and collection methods, and ultimately defines the research question and hypotheses. The first part of the paper examines the historical development of business intelligence, its main characteristics, system architecture, and the BI tools most commonly used in practice today. The next chapter deals with sales, focusing primarily on the sales process, strategies, modern trends, and performance measures. This is followed by a detailed analysis of the functional model of business analytics using a concrete practical example. The use of Power BI tools and the documents used to create the model are presented. The empirical part of the paper includes research involving in-depth interviews with respondents. All three hypotheses are confirmed, meaning that using BI tools, it is possible to identify key metrics for evaluating the effectiveness of sales activities. The application of BI tools can identify weaknesses in current sales strategies and suggest improvements, i.e., the integration of BI tools into sales processes increases the accuracy and timeliness of decisions related to sales strategies. The discussion of results includes an elaboration of the research question, hypotheses, and a critical review. The concluding part of the paper summarizes the achievements and provides a final conclusion along with suggestions for further research. This paper confirms the significant role of BI tools in improving sales activities, as using BI tools leads to improved sales strategies.