Education

Probability Calculator (Two Events)

P(A and B), P(A or B), conditional and complement probabilities.

Education

Local only

P(A) (0–1)P(B) (0–1)Events areP(A and B) (if known)

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How it works

Addition rule P(A∪B) = P(A) + P(B) − P(A∩B); conditional P(A|B) = P(A∩B) ÷ P(B).

Good to know

How do I use it?

Fill in the options and press “Calculate”. Check the result, then copy or download it.

How does it work?

Addition rule P(A∪B) = P(A) + P(B) − P(A∩B); conditional P(A|B) = P(A∩B) ÷ P(B).

Is my data uploaded?

No. Everything is processed in your browser and nothing is sent to a server. No account is needed.