Free Cumulative Poisson Probability Calculator

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Cumulative Poisson Probability Calculator

This calculator will compute cumulative probabilities for a Poisson outcome, given the total number of events observed, the expected number of events per interval, and the total number of intervals. For the total number of events observed k, the calculator will return P(K<k), P(K≤k), P(K>k), and P(K≥k).

Please supply the necessary parameter values, and then click 'Calculate'.

Event occurrences (total):	The total number of times an event was observed to occur across all intervals.
Expected occurrences per interval:	The number of times an event is expected to occur per interval.
Number of intervals:	The total number of intervals during which events were observed. If there is just a single interval, set this value to 1.0.

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