Precise data is a necessity in every community, especially for academics environments. There are many methods in data processing to get the source of information. At least among the academics, there are many programs for data processing, including SPSS, R, Matlab, and others. An efficient calculation tool is one of the most important things to be used by the user to get the precise results of data analysis and describing it to sentences or words in order to help the user. These needs are the basis of every researcher in order to conclude the case. Therefore, this research develops a statistical test application for data analysis using the Website-based of One-Sample T-Test. This statistical test application was developed using the waterfall model. The research that was made produced a statistical test application that can provide a conclusion described in the form of a sentence so that it can help the user in making a conclusion.