Probability Calculator Probability Calculator Probability Calculator Single Event Probability Number of Possible Outcomes: Number of Events Occurred: Calculate Reset Copy Result Please enter a valid number of possible outcomes (greater than 0). Events occurred must be less than or equal to possible outcomes. Probability: Multiple Event Probability Total Number of Events: Number of Desired Events: Calculate Reset Copy Result Please enter a valid number of total events (greater than 0). Desired events must be less than or equal to total events. Probability: