Probability Calculator

Calculate single and combined event probabilities.

Probability Calculator

Enter your values and calculate

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How This Calculator Works

For independent events, the probability of both occurring multiplies; the probability of either occurring adds them and subtracts the overlap. "Neither" is the complement of "either."

Formula

AND: P(A)×P(B); OR: P(A)+P(B)−P(A)×P(B)

Example

Two 50% events: P(both) = 25%, P(either) = 75%, P(neither) = 25%.

Practical Use Cases

  • Games & gambling
  • Risk assessment
  • Quality control
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