<![CDATA[The rapid development of information technology has encouraged the implementation of web-based information systems in various fields, including healthcare. One important aspect of health monitoring is the calculation of Body Mass Index (BMI), ideal body weight, and daily calorie requirements. However, these calculations are often performed manually or through separate applications that do not provide integrated health monitoring. This study aims to design and develop a Web-Based Health Information System for calculating Body Mass Index (BMI), Ideal Body Weight, and Daily Calorie Requirements to assist users in monitoring their health more effectively. The research employed the Research and Development (R&D) method using the Waterfall software development model, consisting of requirement analysis, system design, implementation, testing, and maintenance. The system was developed using the PHP programming language, the CodeIgniter framework, and MySQL as the database management system. The study involved 10 students of Universitas STEKOM as the research sample during the system testing phase. System functionality was evaluated using the Black-Box Testing method to ensure that each feature operated according to the specified requirements. The results indicate that the developed system successfully performs automatic calculations of BMI, ideal body weight, and daily calorie requirements based on user input, stores users' health measurement history, presents accurate calculation results, provides health-related educational articles, and enables administrators to manage user data efficiently. The Black-Box Testing results demonstrate that all system functions operate as expected. Therefore, the proposed system can serve as an effective solution for supporting personal health monitoring and promoting healthier lifestyles.]]>
