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Conditional Probability Calculator

Calculate P(A|B) from an intersection probability and the probability of B.

Your inputs

Your result

Enter your information and select Calculate to see the result.

How this calculator works

Conditional probability divides P(A and B) by P(B).

Change one assumption at a time to see which inputs have the greatest effect on the estimate.

Worked example

If P(A and B) is 0.2 and P(B) is 0.5, P(A|B) is 0.4.

Limitations

This calculator is for educational use; verify important work independently.

Review this educational estimate against current quotes, official information, and your own budget before making a financial decision.