Conditional Probability Calculator

Calculate the probability of event A given that event B has occurred

Calculation Mode:

P(A ∩ B) - Probability of A and B (0 to 1):

P(B) - Probability of B (0 to 1):

Conditional probability is the probability of an event occurring given that another event has already occurred.

Formula: P(A|B) = P(A ∩ B) / P(B)

Independent Events: If A and B are independent, then P(A|B) = P(A) and P(A ∩ B) = P(A) × P(B)

Example: What is the probability of drawing a king given that a face card was drawn?

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This page is maintained as an educational calculator reference.

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Formula Source: Standard Mathematical References

by Various

ðŸ”„Last reviewed: May 2026

âœ“Formula checks are based on standard references and internal QA review.