The Joint Probability Calculator determines the probability that two events occur simultaneously. By inputting the probability of event A and the conditional probability of event B given A, the calculator applies the formula P(A∩B)=P(A)×P(B∣A)P(A ∩ B) = P(A) × P(B|A)P(A∩B)=P(A)×P(B∣A). This value helps in understanding how two events are related, whether they are dependent or independent, and is commonly used in probability theory, statistics, and data analysis to evaluate combined event outcomes.