Conditional Probability Calculator


Conditional probability is a indication used for measuring the probability of an even when another even has taken place already.

We can calculate the conditional probability by dividing the probability of occurrence of two events by the known occurrence. 

That is, lets say the event B has already occurred and we like to find the probability of event B, then we can use the formula: 

Conditional Probability Formula

When event A has already occurred and want to find B, then:

Calculating Conditional Probability

Use the below online conditional probability calculator by entering the required parameters and then click calculate to find the output.


Calculate P(A | B)
P(A ∩ B):
P(B):
P(A | B):


Calculate P(B | A)
P(A ∩ B):
P(A):
P(B | A):






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