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FREE ONLINE TOOL

Free Normal Distribution
Calculator

Calculate normal-distribution probabilities below, above, between or outside values, find inverse percentiles, and construct central normal intervals with a bell-curve visualization.

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About Free Normal Distribution Calculator

Calculate probability below, above, between or outside raw values, reverse a percentile into its matching x-value, or build a central normal interval. The result stays connected to z-scores and the bell curve.

Available actions

  • P(X ≤ x)
  • P(X ≥ x)
  • Between
  • Outside
  • Inverse percentile
  • Central interval