Probability

Conditional Probability Calculator

Compute P(A|B) = P(A∩B) / P(B) with step-by-step work. B becomes the restricted sample space and we find the fraction of B that also contains A.

Live Calculator · Step-by-Step · Probability

Inputs

P(A∩B) — Probability both A and B occur

P(B) — Probability of event B (must be > 0)

Result

Enter values and calculate.

Step-by-Step Work

Your explanation will appear here.

Restricted Sample Space — B as the New Universe