Pevlika Browser Apps

Normal Distribution Calculator

Probabilities below, above or between values, and inverse normal.

Runs in your browser — nothing is uploaded

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How to use Normal Distribution Calculator

  1. Enter your values — the unit for each field is shown next to it.
  2. The result updates instantly as you type.
  3. Copy the results, or change inputs to compare scenarios.

Formula & assumptions

P(X < a) = Φ((a − μ)/σ)

Example: IQ scores (μ = 100, σ = 15): 68.3% lie between 85 and 115.

Z-Score CalculatorConvert values to z-scores and find normal probabilities and percentiles. Binomial Probability CalculatorExact and cumulative binomial probabilities. Confidence Interval CalculatorConfidence intervals for a mean (t or z) or a proportion. Statistics CalculatorMean, median, mode, standard deviation, variance and quartiles of a list.