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Free Probability
Calculator

Calculate exact probabilities from outcomes, independent or dependent events, Bayes updates, repeated trials, and odds. Supports fractions, decimals and percentages.

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FreeUse this tool without paying.No sign upStart with the tool right away.Clear stepsRead the tool’s own guidance.

About Free Probability Calculator

Move from favorable outcomes to event algebra, conditional probability, Bayes updates, repeated independent trials and odds—without hiding whether independence is being assumed.

Available actions

  • Favorable / total
  • Two independent events
  • Conditional / Bayes
  • Repeated event
  • Probability ↔ odds
  • Calculate probability