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 enter the necessary parameter values, and then click 'Calculate'.