Enter probabilities between 0 and 1. Results below assume A and B are independent events.
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P(A and B)
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P(A or B)
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P(not A)
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P(not B)
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P(A but not B)
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P(neither)
Frequently Asked Questions
What does “independent events” mean?
Two events are independent when one occurring does not change the probability of the other. Then P(A and B) = P(A) × P(B). If the events are dependent, these formulas do not apply directly.
Calculate the probability of two independent events: A and B, A or B, and more.