Probability Calculator

Select Calculation Mode

Probability of Two Events

Please input values between 0 and 1.

Venn Diagram

About Probability

Probability measures the likelihood of an event occurring, expressed as a number between 0 and 1. This calculator computes probabilities for two independent events, solves for unknown probabilities, calculates probabilities of repeated events, and finds the probability under a normal distribution curve.

Key Concepts:

  • Two Events: Calculates union, intersection, and exclusive probabilities.
  • Solver: Determines all probabilities given any two known values.
  • Series: Computes probabilities for repeated independent events.
  • Normal Distribution: Finds probability between bounds using z-scores.

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Calculation Tips

  • Ensure probabilities are between 0 and 1 for two events and solver modes.
  • For series, repeats must be positive integers.
  • Use -inf or inf for normal distribution bounds when appropriate.