The Bayes' Theorem Calculator provides a helpful way to determine conditional probabilities using the Bayes' Theorem formula in the format P(A|B)=(P(A)*P(B|A))/P(B). You are initially requested to input "What is the probability of:" (event A occurring) "Given that:" (event B has occurred) The calculator then populates Bayes' Theorem with this information to provide a clear understanding of your problem. The calculator then asks for the following probability percentages: P(A)% P(B|A)% P(B)% The calculator then calculates the Bayes' Theorem results. The calculator also calculates a table of observation percentages that helps with understanding the overall problem structure. To help verify results, the calculator provides a detailed calculation of the Bayes' Theorem using the included Table of Observation Percentages. Finally, sample problems are provided to assist you with setting up your problem and input percentages.