In this paper, the study of Blended Learning (BL) for Calculus Course is proposed. Based on the observation, most of first year students of Universiti Malaysia Sabah (UMS) that have taken calculus course failed due to unsuitable learning approach. The traditional classroom learning used for teaching makes students misunderstand the concept and lack of enthusiasm in learning calculus course, since their first impression is to consider the calculus a difficult course in university and college. In order to overcome the problem, three objectives were proposed in this project, which are to identify the suitable media for BL in calculus using quantitative method, to develop the web-based system, namely as WebBLoC, based on selected media using calculus syllabus and finally to evaluate the developed system. For the development, the Waterfall model is used as a system development method to study the BL system. In general, this project expected to decrease the number of students failed in calculus and provide them more understanding the concepts and formulas of calculus by using the developed BL system (WebBLoC). � 2019, Springer Nature Singapore Pte Ltd.