Probability Calculator
Calculate the probability of two events occurring together or separately, and the binomial chance of exactly k successes in n trials. Free, instant and easy to read.
Two events
Enter a percentage (e.g. 50) or a decimal between 0 and 1.
Binomial — exactly k successes
P(A and B)
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P(A or B)
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P(not A)
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P(exactly k)
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Independent events assume one outcome does not affect the other. Mutually exclusive events cannot both happen, so P(A and B) is 0. The binomial result is the chance of exactly k successes in n independent trials.